ASTM F891-24

Standard Specification for Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With a Cellular Core

ABSTRACT
This specification covers coextruded poly(vinyl chloride) plastic pipe with a cellular core and concentric inner and outer solid layers. The pipe is produced using a multilayer coextrusion die for nonpressure use in three series: an IPS Schedule 40 series; a PS series with an iron pipe size outside diameter with varying wall thickness as required for pipe stiffness of 25, 50, and 100; and a sewer and drain series. The pipe shall comply with the minimum wall thickness, outside diameter, length, stiffness, flattening, impact strength, bond strength, and extrusion quality requirements.
SCOPE
1.1 This specification covers coextruded poly(vinyl chloride) (PVC) plastic pipe with a cellular core and concentric inner and outer solid layers, and is produced using a multilayer coextrusion die for nonpressure use in three series: an IPS Schedule 40 series for DWV; a PS series with an iron pipe size (IPS) outside diameter with varying wall thickness as required for pipe stiffnesses of 25, 50, and 100 for communication conduit, and a sewer and drain series.  
1.2 The function of this specification is to provide standardization of product-technical data and serve as a purchasing guide.  
1.3 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. The notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
Note 1: All the pipe series covered by this specification are permitted to be perforated or belled for joining by solvent cement or belled for joining by an elastomeric seal (gasket). Because this pipe is OD controlled, the inside diameter will vary, and therefore, the pipe ID is not suitable for use as a socket. (For more information see Specification D2672.)
Note 2: This standard specifies dimensional, performance and test requirements for plumbing and fluid handling applications, but does not address venting of combustion gases.  
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Note 3: Specifications related to this specification are as follows: D2665, D2729, D3034, F512, F758, and F789.  
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Mar-2024
• ICS: 23.040.20 - Plastics pipes
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.25 - Vinyl Based Pipe

Relations

• Replaces: ASTM F891-23 - Standard Specification for Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With a Cellular Core
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1499-22 - Standard Specification for Coextruded Composite Drain, Waste, and Vent Pipe (DWV)
• Effective Date: 01-Apr-2024
• Referred By: ASTM F481-97(2019) - Standard Practice for Installation of Thermoplastic Pipe and Corrugated Pipe in Septic Tank Leach Fields
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1866-23 - Standard Specification for Poly (Vinyl Chloride) (PVC) Plastic Schedule 40 Drainage and DWV Fabricated Fittings
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1488-14(2019) - Standard Specification for Coextruded Composite Pipe
• Effective Date: 01-Apr-2024
• Referred By: ASTM F1336-20 - Standard Specification for Poly(Vinyl Chloride) (PVC) Gasketed Sewer Fittings
• Effective Date: 01-Apr-2024
• Referred By: ASTM F412-23 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Apr-2024
• Referred By: ASTM F2021-17(2022) - Standard Guide for Design and Installation of Plastic Siphonic Roof Drainage Systems
• Effective Date: 01-Apr-2024
• Referred By: ASTM D2855-20 - Standard Practice for the Two-Step (Primer and Solvent Cement) Method of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated Poly (Vinyl Chloride) (CPVC) Pipe and Piping Components with Tapered Sockets
• Effective Date: 01-Apr-2024

Overview

ASTM F891-24: Standard Specification for Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With a Cellular Core establishes the requirements for coextruded PVC plastic pipes featuring a solid inner and outer layer with a specialized cellular (foamed) core. Designed for nonpressure applications, this standard covers three primary pipe series: IPS Schedule 40 for drain, waste, and vent (DWV) piping; the PS series for communication conduit; and sewer and drain pipe. ASTM F891-24 provides detailed specifications for dimensional, material, performance, quality, and marking requirements, ensuring consistency, safety, and reliability in plumbing and fluid handling installations.

Key Topics

Pipe Series Covered

• IPS Schedule 40: Pipes with iron pipe size (IPS) outside diameter and standardized wall thickness used for DWV systems.
• PS Series: Pipes with IPS outside diameter and wall thickness tailored to required pipe stiffness (25, 50, 100), intended primarily for communication conduit.
• Sewer and Drain Series: Pipes designed for nonpressure sewer and drain lines, meeting minimum wall thickness and stiffness criteria for underground burial.

Construction and Materials

• Coextruded PVC Structure: Manufactured using a multilayer coextrusion process, ensuring bonding of layers for strength and durability.
• Cellular (Foamed) Core: Provides a lightweight yet robust core, sandwiched between solid PVC layers.
• Material Requirements: All PVC materials comply with referenced ASTM specifications and cell classification for quality assurance. Only clean, manufacturer rework is allowed, and only in the core layer.

Physical and Performance Requirements

• Minimum Wall Thickness: Pipe thickness must meet or exceed specified values for each series to ensure long-term performance.
• Pipe Stiffness: Defined pipe stiffness values at 5% deflection for structural performance, tested as per ASTM test methods.
• Impact and Flattening: Pipes undergo impact strength and flattening tests to confirm resistance to handling and installation stresses.
• Bond Strength: Multilayer bond must withstand separation attempts and testing procedures.
• Dimensions and Tolerances: Outside diameter and roundness are controlled within strict tolerances.

Joining and Installation

• Joining Methods: Pipes may be joined by solvent cement or elastomeric gaskets. Fitting compatibility and proper assembly are crucial for leak-free performance.
• Installation Guidance: Recommendations include proper storage, cutting, joining, support spacing, and allowance for thermal expansion and freezing conditions.

Quality Assurance and Marking

• Testing and Sampling: Detailed procedures for sampling, conditioning, and retesting ensure compliance.
• Pipe Marking: Clear, legible marking every 5 feet with product, manufacturer, standard reference, size, and series information.

Applications

ASTM F891-24 pipes are optimized for a variety of nonpressure fluid handling applications, including:

• Residential and Commercial DWV Systems: Reliable drainage, waste, and vent piping in new construction and renovations.
• Underground Sewer and Drain: Sewer mains, drainage laterals, and highway underdrain for effective water conveyance.
• Communication Conduit: Protective conduit for underground telecommunications cabling, not to be used for electrical power distribution.
• Stormwater Management: Ideal for gravity flow applications requiring lightweight yet structurally resilient piping.
• Other Nonpressure Utility Uses: Where standardized performance, durability, and ease of installation are required.

Properly installed coextruded cellular core PVC pipes deliver cost-effective, high-performance solutions for long-lasting municipal, commercial, and residential infrastructure.

Related Standards

Several ASTM and ANSI standards are closely related to ASTM F891-24, supporting materials, testing, and joining systems:

• ASTM D2665: PVC plastic drain, waste, and vent pipe and fittings
• ASTM D2729 & D3034: PVC sewer pipe and fittings
• ASTM F512 & F758: PVC conduit and underdrain systems
• ASTM F477 & D3212: Elastomeric seals for joining plastic pipes
• ASTM D2122, D2152, D2412, D2444, D2564: Test methods and solvent cement specifications for PVC pipes and fittings
• ANSI Z34.1 & Z34.2: Third-party and self-certification programs

ASTM F891-24 references and complements these standards to ensure holistic quality, safety, and performance in plastic piping systems. For comprehensive compliance and compatibility, users should consult all applicable standards for their specific projects and jurisdictions.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F891 − 24 An American National Standard
Standard Specification for
Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With a
Cellular Core
This standard is issued under the fixed designation F891; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers coextruded poly(vinyl chlo-
ization established in the Decision on Principles for the
ride) (PVC) plastic pipe with a cellular core and concentric
Development of International Standards, Guides and Recom-
inner and outer solid layers, and is produced using a multilayer
mendations issued by the World Trade Organization Technical
coextrusion die for nonpressure use in three series: an IPS
Barriers to Trade (TBT) Committee.
Schedule 40 series for DWV; a PS series with an iron pipe size
(IPS) outside diameter with varying wall thickness as required
2. Referenced Documents
for pipe stiffnesses of 25, 50, and 100 for communication
2.1 ASTM Standards:
conduit, and a sewer and drain series.
D618 Practice for Conditioning Plastics for Testing
1.2 The function of this specification is to provide standard-
D1600 Terminology for Abbreviated Terms Relating to Plas-
ization of product-technical data and serve as a purchasing
tics (Withdrawn 2024)
guide.
D2122 Test Method for Determining Dimensions of Ther-
1.3 The text of this specification references notes, footnotes,
moplastic Pipe and Fittings
and appendixes which provide explanatory material. The notes
D2152 Test Method for Adequacy of Fusion of Extruded
and footnotes (excluding those in tables and figures) shall not
Poly(Vinyl Chloride) (PVC) Pipe and Molded Fittings by
be considered as requirements of the specification.
Acetone Immersion
D2321 Practice for Underground Installation of Thermoplas-
NOTE 1—All the pipe series covered by this specification are permitted
tic Pipe for Sewers and Other Gravity-Flow Applications
to be perforated or belled for joining by solvent cement or belled for
joining by an elastomeric seal (gasket). Because this pipe is OD
D2412 Test Method for Determination of External Loading
controlled, the inside diameter will vary, and therefore, the pipe ID is not
Characteristics of Plastic Pipe by Parallel-Plate Loading
suitable for use as a socket. (For more information see Specification
D2444 Practice for Determination of the Impact Resistance
D2672.)
of Thermoplastic Pipe and Fittings by Means of a Tup
NOTE 2—This standard specifies dimensional, performance and test
(Falling Weight)
requirements for plumbing and fluid handling applications, but does not
address venting of combustion gases.
D2564 Specification for Solvent Cements for Poly(Vinyl
Chloride) (PVC) Plastic Piping Systems
1.4 The values stated in inch-pound units are to be regarded
D2665 Specification for Poly(Vinyl Chloride) (PVC) Plastic
as standard. The values given in parentheses are mathematical
Drain, Waste, and Vent Pipe and Fittings
conversions to SI units that are provided for information only
D2672 Specification for Joints for IPS PVC Pipe Using
and are not considered standard.
Solvent Cement
NOTE 3—Specifications related to this specification are as follows:
D2729 Specification for Poly(Vinyl Chloride) (PVC) Sewer
D2665, D2729, D3034, F512, F758, and F789.
Pipe and Fittings
1.5 This standard does not purport to address all of the
D2855 Practice for the Two-Step (Primer and Solvent Ce-
safety concerns, if any, associated with its use. It is the
ment) Method of Joining Poly (Vinyl Chloride) (PVC) or
responsibility of the user of this standard to establish appro-
Chlorinated Poly (Vinyl Chloride) (CPVC) Pipe and
priate safety, health, and environmental practices and deter-
Piping Components with Tapered Sockets
mine the applicability of regulatory limitations prior to use.
1 2
This specification is under the jurisdiction of ASTM Committee F17 on Plastic For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Piping Systems and is the direct responsibility of Subcommittee F17.25 on Vinyl contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Based Pipe. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved April 1, 2024. Published April 2024. Originally the ASTM website.
approved in 1985. Last previous edition approved in 2023 as F891 – 23. DOI: The last approved version of this historical standard is referenced on
10.1520/F0891-24. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F891 − 24
D3034 Specification for Type PSM Poly(Vinyl Chloride) 3.2.3 coextrusion—a process whereby two or more heated
(PVC) Sewer Pipe and Fittings or unheated plastic material streams, forced through one or
D3212 Specification for Joints for Drain and Sewer Plastic more shaping orifice(s), become one continuously formed
Pipes Using Flexible Elastomeric Seals piece.
D3311 Specification for Drain, Waste, and Vent (DWV)
3.3 Definitions of Terms Specific to This Standard:
Plastic Fittings Patterns
3.3.1 lot—a lot shall consist of all pipe of the same size
D4396 Specification for Rigid Poly(Vinyl Chloride) (PVC)
produced from one extrusion line during one designated shift.
and Chlorinated Poly(Vinyl Chloride) (CPVC) Com-
3.3.2 IPS Schedule 40 Series—pipe produced to an iron pipe
pounds for Plastic Pipe and Fittings Used in Nonpressure
size (IPS) outside diameter (OD) with a Schedule 40 wall
Applications
thickness for use as drain, waste, and vent pipe.
F402 Practice for Safe Handling of Solvent Cements,
3.3.3 PS Series— pipe produced to an IPS outside diameter
Primers, and Cleaners Used for Joining Thermoplastic
and having the required wall thickness to meet a designated
Pipe and Fittings
pipe stiffness for use as communication conduit.
F412 Terminology Relating to Plastic Piping Systems
F477 Specification for Elastomeric Seals (Gaskets) for Join-
3.3.4 sewer and drain series—pipe produced to a sewer and
ing Plastic Pipe
drain outside diameter and having a minimum wall thickness to
F512 Specification for Smooth-Wall Poly(Vinyl Chloride)
meet a designated pipe stiffness. for use as sewer and drain
(PVC) Conduit and Fittings for Underground Installation
pipe.
F545 Specification for PVC and ABS Injected Solvent Ce-
4. Classification by Application
mented Plastic Pipe Joints (Withdrawn 2001)
F656 Specification for Primers for Use in Solvent Cement
4.1 Coextruded PVC plastic pipe, in an IPS Schedule 40
Joints of Poly(Vinyl Chloride) (PVC) Plastic Pipe and
series, for use as shown in 4.4, is referenced in Table 1.
Fittings
4.2 Coextruded PVC plastic pipe in a PS series with an IPS
F758 Specification for Smooth-Wall Poly(Vinyl Chloride)
OD and varying wall thicknesses as required for pipe stiff-
(PVC) Plastic Underdrain Systems for Highway, Airport,
nesses of 25 psi, 50 psi, and 100 psi, for use as shown in 4.5 is
and Similar Drainage
referenced in Table 2.
F789 Specification for Type PS-46 and Type PS-115 Poly-
(Vinyl Chloride) (PVC) Plastic Gravity Flow Sewer Pipe 4.3 Coextruded PVC plastic pipe in a sewer and drain series
for use as shown in 4.6 and 4.7 is referenced in Table 2.
and Fittings (Withdrawn 2004)
2.2 Federal Standard:
4.4 Drain, waste, and vent pipe in IPS Schedule 40 series.
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
4.5 Underground communication conduit in PS series, not
2.3 Military Standard:
for underground electrical power distribution usage.
MIL-STD-129 Marking for Shipment and Storage
4.6 Nonpressure sewer and drain pipe for underground
2.4 ANSI Standards:
burial outside of the building.
Z34.1 American National Standard for Certification-Third-
4.7 Highway underdrain in sewer and drain series.
Party Certification Program
Z34.2 American National Standard for Certification-Self- 4.8 Recommendations for storage, joining, and installation
Certification by Producer or Supplier
are provided in Appendix X1, Appendix X2, and Appendix
X3, respectively.
3. Terminology
NOTE 4—Before installing pipe for industrial waste disposal use, the
3.1 Definitions—Definitions are in accordance with Termi- approval of the cognizant building code authority must be obtained, as
conditions not commonly found in normal use may be encountered.
nology F412, and abbreviations are in accordance with Termi-
nology D1600, unless otherwise specified. The abbreviation for
poly(vinyl chloride) plastic is PVC.
A
TABLE 1 Minimum Wall Thickness, Pipe Stiffness, and Impact
Strength for IPS Schedule 40 Series
3.2 Definitions:
Nominal Pipe Wall Thickness, Pipe Stiffness, Impact Strength,
3.2.1 cellular plastic—a plastic containing numerous cells,
Size in. lbf/in. ft·lbf
intentionally introduced, interconnecting or not, distributed
1 ⁄4 0.140 600 40
throughout the mass.
1 ⁄2 0.145 600 50
2 0.154 300 80
3.2.2 coextruded pipe—pipe consisting of two or more
3 0.216 300 100
concentric layers of material bonded together in processing by
3 ⁄2 0.226 250 100
any combination of temperature, pressure, grafting,
4 0.237 200 100
5 0.258 120 100
crosslinking, or adhesion.
6 0.280 120 120
8 0.322 100 120
10 0.365 60 120
4 12 0.406 50 120
DLA Document Services Building 4/D 700 Robbins Avenue Philadelphia, PA
A
19111-5094 http://quicksearch.dla.mil/
The maximum wall thickness shall not be greater than 1.25 times the minimum
Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
wall thickness.
4th Floor, New York, NY 10036, http://www.ansi.org.
F891 − 24
A
TABLE 2 Minimum Wall Thickness for PS Series or Sewer and Drain Series for Minimum Pipe Stiffness
Wall Thickness, in.
Nominal
PS Series Sewer and Drain Series
Pipe Size
PS 25 PS 50 PS 100 PS 12.5 PS 25 PS 50 PS 100
2 . . . . . . 0.100 . . . . . . . . . . . .
3 . . . 0.103 0.130 . . . . . . 0.100 0.120
3 ⁄2 0.100 0.118 0.148 . . . . . . . . . . . .
4 0.106 0.133 0.167 . . . 0.100 0.124 0.156
5 0.131 0.164 0.206 . . . . . . . . . . . .
6 0.156 0.195 0.245 0.118 0.148 0.185 0.232
8 . . . . . . . . . . . . 0.198 0.248 0.310
10 . . . . . . . . . . . . . . . 0.310 0.388
12 . . . . . . . . . . . . . . . 0.369 0.462
15 . . . . . . . . . . . . . . . 0.452 0.565
18 . . . . . . . . . . . . . . . 0.548 0.691
A
The maximum wall thickness shall not be greater than 1.25 times the minimum wall thickness.
NOTE 5—This specification does not include requirements for pipe and
6.2.1 Outside Diameter—The outside diameter and toler-
fittings intended to be used to vent combustion gases.
ances for the IPS Schedule 40 series, PS series, and the sewer
and drain series shall meet the requirements of Table 3 when
5. Material
measured in accordance with Test Method D2122. The toler-
5.1 Material Specification—The PVC material for all layers
ances for out-of-roundness shall apply to the pipe prior to
shall conform to the requirements prescribed in Specification
shipment.
D4396 with a cell class of 11432. PVC material, which has a
6.2.2 Wall Thickness—The wall thickness for the IPS
higher cell class than those listed, is acceptable.
Schedule 40 series shall equal or exceed the minimum dimen-
5.2 Rework Material—The manufacturer shall use only his
sions in Table 1, and for the PS series and sewer and drain
own clean rework pipe material conforming with these cell series it shall equal or exceed the minimum dimensions in
class requirements. It shall be used only in the core layer if it
Table 2, when measured in accordance with Test Method
contains any residual blowing agent. The pipe produced shall D2122.
meet all requirements of this specification.
6.2.3 Length—The pipe length may be 10 or 20 ft with a
tolerance on length of + ⁄2, −0 in., unless otherwise specified.
5.3 Cellular Material—Cellular PVC used in the core layer
shall be of a closed cell structure when tested in accordance
6.3 Performance Requirements:
with 6.3.6.
6.3.1 Pipe Stiffness—The minimum pipe stiffness values at
5 % deflection when measure in accordance with Test Method
6. Requirements
D2412, shall equal or exceed the value in Table 1 for IPS
6.1 Workmanship—The pipe shall be homogeneous
Schedule 40 series, or the value in Table 2 or PS series and
throughout and free of visible cracks, holes, foreign inclusions,
sewer and drain series. Three specimens shall be tested. If all
or other defects. The pipe shall be as uniform as commercially
three meet this requirement, the sample meets this requirement.
practicable in color, opacity, density, and other physical prop-
If one or two fail, additional testing shall be conducted in
erties.
accordance with 6.3.1.1. If all three fail, the sample does not
6.2 Dimensions and Tolerances: meet the requirement.
TABLE 3 Outside Diameter and Tolerances
Outside Diameter Out-of-Roundness Maxi-
mum Diameter Minus
Tolerance on Average
IPS Schedule 40
Nominal Pipe Size
Sewer and Drain
Minimum Diameter, in.
Outside Diameter, in.
Series, in. PS
Series, in.
Series, in.
1 ⁄4 1.660 . . . ±0.005 0.060
1 ⁄2 1.900 . . . ±0.006 0.060
2 2.375 . . . ±0.006 0.060
3 3.500 3.250 ±0.008 0.060
3 ⁄2 4.000 . . . ±0.008 0.100
4 4.500 4.215 ±0.009 0.100
5 5.563 . . . ±0.010 0.100
6 6.625 6.275 ±0.011 0.100
8 8.625 8.400 ±0.015 0.150
10 10.750 10.500 ±0.015 0.150
12 12.750 12.500 ±0.015 0.150
15 . . . 15.300 ±0.023 0.150
18 . . . 18.700 ±0.028 0.200
F891 − 24
TABLE 4 Minimum Impact Strength for PS Series or Sewer and
6.3.1.1 Pipe Stiffness and Lower Confidence Limit—In the
Drain Series
event that one or two of the specimens tested in 6.3.1 fail to
Minimum Impact Strength, ft·lbf
Nominal Pipe
meet the minimum requirement, the average pipe stiffness of
Size
PS 12.5 PS 25 PS 50 PS 100
11 specimens shall meet or exceed the minimum requirement
2 . . . . . . . . . 80
given in Table 1 for IPS Schedule 40 series pipe, and Table 2
3 . . . 80 80 100
for PS Series and Sewer and Drain pipe. The 99 % lower
3 ⁄2 . . . 80 80 100
4 . . . 80 100 100
confidence limit (LCL) shall be within 15 % of the average
5 . . . 100 100 100
value. The LCL shall be calculated using the Student’s “t”
6 70 100 100 120
distribution, with N-1 degrees of freedom, where N is the
8 . . . 140 140 140
10 . . . 160 160 160
number of specimens (11). The critical t value shall be used to
12 . . . 200 200 200
at least three significant digits. Alternatively, if the LCL
15 . . . . . . 220 . . .
exceeds the minimum PS requirement in the applicable table, 18 . . . . . . 220 . . .
but is not within 15 % of the average, the sample meets the
requirements of the pipe stiffness testing. The 11 specimens
include the three tested under 6.3.1, and an additional eight
with rotation by 35°, as specified in D2412, continuing
6.3.3.2 Failure of the test specimen shall be shattering or
throughout the remaining specimens.
any crack or break extending entirely through the pipe wall and
The LCL based on testing eleven specimens is calculated as
visible to the unaided eye.
follows:
6.3.4 Bond—The bond between layers shall be strong and
uniform. It shall not be possible to separate any two layers with
LCL 5 ~avg PS! 2 $2.76 ~std. dev.!/=~N!%
a probe or the point of a knife blade so that the layers separate
where:
cleanly, nor shall separation of the bond occur between layers
during testing performed under the requirements of this speci-
N = 11
(avg PS) = [∑(PS )]/(11)
fication.
i
2 1/2
PS 2~ PS! /N
(std.dev.) = ( (
6.3.5 Extrusion Quality—The pipe shall meet the require-
F G
N21
ments of Test Method D2152.
The 15 % requirement is calculated as follows:
6.3.6 Cellular Structure—The core layer of cellular core
pipe shall not allow the passage of water when tested at 10 6
~avg 2 LCL!/~avg! × 100 # 15 %
1 psig for a minimum of 30 minutes. The test sample shall be
NOTE 6—The 5 % deflection criteria is arbitrarily selected for testing
18 6 0.125 in. long. Create a seal on the O.D. and the I.D. of
convenience. It should not be considered as a limitation with respect to
in-use deflection. The engineer is responsible for establishing the accept- the pipe near one end in a manner that permits the exposed core
able deflection limit.
to be subjected to water pressure (Note 9). Any sign of water
NOTE 7—The strength and load-carrying capabilities of plastic pipe are
emanating from the core at the opposite end after 30 minutes is
measured and reported as pipe stiffness, which is determined in accor-
indication of an open cell structure and the specimen does not
dance with Test Method D2412. The term “crushing strength” is not
meet the requirements of this specification.
applicable to plastic piping.
NOTE 9—The method of sealing against the I.D. and O.D. of the pipe is
6.3.2 Pipe Flattening—There shall be no evidence of
not specified, as several acceptable methods are available. One such
cracking, delamination, or rupture when pipe is deflected 60 %
method uses an elastomeric no-hub adapter clamped to the O.D. and
of the initial inside diameter, when tested in accordance with
pneumatic or mechanical test plug to seal the I.D.
Test Method D2412. Three specimens shall be tested and all
6.4 Other Requirements:
shall pass.
6.4.1 Joining—Coextruded poly(vinyl chloride) PVC plas-
tic pipe produced in IPS Schedule 40 series and PS series are
NOTE 8—This test is intended only for use as a quality control test, and
joined using fittings meeting the requirements of Specifications
not as a simulated service test.
D2665, D3311, or F512. Fittings meeting the requirements of
6.3.3 Impact Resistance—The minimum impact resistance,
Specifications D2729, D3034, or F789 are used with the sewer
when tested at the time of manufacture, shall comply with
and drain series, and Specification F545 are permitted for all
Table 1 for IPS Schedule 40 series and Table 4 for the PS series
series.
and sewer and drain series. Test in accordance with Test
6.4.2 Solvent Cement—In the assembly of solvent cement
Method D2444, using Tup B and Holder B. Use a 20-lb
joints, the safety requirements of Practice F402 shall be
(9.1-kg) tup for testing pipe sizes 4 in. and smaller and a 30-lb
followed and the joint shall be assembled following Practice
(13.6-kg) tup for pipe sizes larger than 4 in.
D2855, using a cleaner or primer.
6.3.3.1 Test 10 specimens. When 9 or 10 specimens pass,
6.4.3 Gaskets—Elastomeric seals (gaskets) shall meet the
accept the lot. When 2 or more specimens fail, test 10
requirements of Specification F477.
additional specimens. When 17 of 20 specimens tested pass,
6.4.4 Lubricant—The lubricant used for assembly shall
accept the lot. When 4 or more of 20 specimens fail, test 20
have no detrimental effect on the gasket or on the pipe or
additional specimens. When 32 of 40 specimens pass, accept fitting.
the lot. When 9 or more of 40 specimens fail, the lot does not
6.4.5 Gasket Joints—Gasket joints shall comply with Speci-
meet the requirements of this specification. fication D3212 and be designed so that the gasket inside the
F891 − 24
pipe will be compressed radially on the pipe spigot, when 9. Marking
assembled, to form a water-tight seal.
9.1 Quality of Marking—The marking shall be applied to
6.4.6 Gasket Displacement—The joint shall be designed to
the pipe for end-use application in such a manner that it
avoid displacement of the gasket when installed. The assembly
remains legible (easily read) after installation and inspection.
of the joint shall be in accordance with the manufacturer’s
9.2 Content of Marking—The pipe shall be marked at least
recommendation.
every 5 ft in letters not less than ⁄16 in. high and in a color that
contrasts with the color of the pipe, and shall contain the
7. Sampling and Conditioning
following information:
7.1 Sampling—The selection of the sample or samples of
9.2.1 Manufacturer’s name or trademark.
pipe shall be as agreed upon by the purchaser and seller. In case
9.2.2 This designation, ASTM F891, including the year of
of no prior agreement, any sample selected by the testing lab
issue.
shall be deemed adequate.
9.2.3 The wording “COEXTRUDED CELLULAR CORE
7.2 Conditioning:
PVC PIPE”.
7.2.1 For referee purposes, condition the specimens prior to 9.2.3.1 Typical marking for identification of each series
test at 73 °F 6 4 °F (23 °C
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: F891 − 23 F891 − 24 An American National Standard
Standard Specification for
Coextruded Poly(Vinyl Chloride) (PVC) Plastic Pipe With a
Cellular Core
This standard is issued under the fixed designation F891; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This specification covers coextruded poly(vinyl chloride) (PVC) plastic pipe with a cellular core and concentric inner and outer
solid layers, and is produced using a multilayer coextrusion die for nonpressure use in three series: an IPS Schedule 40 series for
DWV; a PS series with an iron pipe size (IPS) outside diameter with varying wall thickness as required for pipe stiffnesses of 25,
50, and 100 for communication conduit, and a sewer and drain series.
1.2 The function of this specification is to provide standardization of product-technical data and serve as a purchasing guide.
1.3 The text of this specification references notes, footnotes, and appendixes which provide explanatory material. The notes and
footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
NOTE 1—All the pipe series covered by this specification are permitted to be perforated or belled for joining by solvent cement or belled for joining by
an elastomeric seal (gasket). Because this pipe is OD controlled, the inside diameter will vary, and therefore, the pipe ID is not suitable for use as a socket.
(For more information see Specification D2672.)
NOTE 2—This standard specifies dimensional, performance and test requirements for plumbing and fluid handling applications, but does not address
venting of combustion gases.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
NOTE 3—Specifications related to this specification are as follows: D2665, D2729, D3034, F512, F758, and F789.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.25 on Vinyl Based
Pipe.
Current edition approved Sept. 1, 2023April 1, 2024. Published September 2023April 2024. Originally approved in 1985. Last previous edition approved in 20162023 as
F891 – 16.F891 – 23. DOI: 10.1520/F0891-23.10.1520/F0891-24.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F891 − 24
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D1600 Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2152 Test Method for Adequacy of Fusion of Extruded Poly(Vinyl Chloride) (PVC) Pipe and Molded Fittings by Acetone
Immersion
D2321 Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications
D2412 Test Method for Determination of External Loading Characteristics of Plastic Pipe by Parallel-Plate Loading
D2444 Practice for Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling
Weight)
D2564 Specification for Solvent Cements for Poly(Vinyl Chloride) (PVC) Plastic Piping Systems
D2665 Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and Vent Pipe and Fittings
D2672 Specification for Joints for IPS PVC Pipe Using Solvent Cement
D2729 Specification for Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings
D2855 Practice for the Two-Step (Primer and Solvent Cement) Method of Joining Poly (Vinyl Chloride) (PVC) or Chlorinated
Poly (Vinyl Chloride) (CPVC) Pipe and Piping Components with Tapered Sockets
D3034 Specification for Type PSM Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings
D3212 Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals
D3311 Specification for Drain, Waste, and Vent (DWV) Plastic Fittings Patterns
D4396 Specification for Rigid Poly(Vinyl Chloride) (PVC) and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds for
Plastic Pipe and Fittings Used in Nonpressure Applications
F402 Practice for Safe Handling of Solvent Cements, Primers, and Cleaners Used for Joining Thermoplastic Pipe and Fittings
F412 Terminology Relating to Plastic Piping Systems
F477 Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe
F512 Specification for Smooth-Wall Poly(Vinyl Chloride) (PVC) Conduit and Fittings for Underground Installation
F545 Specification for PVC and ABS Injected Solvent Cemented Plastic Pipe Joints (Withdrawn 2001)
F656 Specification for Primers for Use in Solvent Cement Joints of Poly(Vinyl Chloride) (PVC) Plastic Pipe and Fittings
F758 Specification for Smooth-Wall Poly(Vinyl Chloride) (PVC) Plastic Underdrain Systems for Highway, Airport, and Similar
Drainage
F789 Specification for Type PS-46 and Type PS-115 Poly(Vinyl Chloride) (PVC) Plastic Gravity Flow Sewer Pipe and Fittings
(Withdrawn 2004)
2.2 Federal Standard:
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
2.3 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
2.4 ANSI Standards:
Z34.1 American National Standard for Certification-Third-Party Certification Program
Z34.2 American National Standard for Certification-Self-Certification by Producer or Supplier
3. Terminology
3.1 Definitions—Definitions are in accordance with Terminology F412, and abbreviations are in accordance with Terminology
D1600, unless otherwise specified. The abbreviation for poly(vinyl chloride) plastic is PVC.
3.2 Definitions:
3.2.1 cellular plastic—a plastic containing numerous cells, intentionally introduced, interconnecting or not, distributed throughout
the mass.
3.2.2 coextruded pipe—pipe consisting of two or more concentric layers of material bonded together in processing by any
combination of temperature, pressure, grafting, crosslinking, or adhesion.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
DLA Document Services Building 4/D 700 Robbins Avenue Philadelphia, PA 19111-5094 http://quicksearch.dla.mil/
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
F891 − 24
3.2.3 coextrusion—a process whereby two or more heated or unheated plastic material streams, forced through one or more
shaping orifice(s), become one continuously formed piece.
3.3 Definitions of Terms Specific to This Standard:
3.3.1 lot—a lot shall consist of all pipe of the same size produced from one extrusion line during one designated shift.
3.3.2 IPS Schedule 40 Series—pipe produced to an iron pipe size (IPS) outside diameter (OD) with a Schedule 40 wall thickness
for use as drain, waste, and vent pipe.
3.3.3 PS Series— pipe produced to an IPS outside diameter and having the required wall thickness to meet a designated pipe
stiffness for use as communication conduit.
3.3.4 sewer and drain series—pipe produced to a sewer and drain outside diameter and having a minimum wall thickness to meet
a designated pipe stiffness. for use as sewer and drain pipe.
4. Classification by Application
4.1 Coextruded PVC plastic pipe, in an IPS Schedule 40 series, for use as shown in 4.4, is referenced in Table 1.
4.2 Coextruded PVC plastic pipe in a PS series with an IPS OD and varying wall thicknesses as required for pipe stiffnesses of
25 psi, 50 psi, and 100 psi, for use as shown in 4.5 is referenced in Table 2.
4.3 Coextruded PVC plastic pipe in a sewer and drain series for use as shown in 4.6 and 4.7 is referenced in Table 2.
4.4 Drain, waste, and vent pipe in IPS Schedule 40 series.
4.5 Underground communication conduit in PS series, not for underground electrical power distribution usage.
4.6 Nonpressure sewer and drain pipe for underground burial outside of the building.
4.7 Highway underdrain in sewer and drain series.
4.8 Recommendations for storage, joining, and installation are provided in Appendix X1, Appendix X2, and Appendix X3,
respectively.
NOTE 4—Before installing pipe for industrial waste disposal use, the approval of the cognizant building code authority must be obtained, as conditions
not commonly found in normal use may be encountered.
A
TABLE 1 Minimum Wall Thickness, Pipe Stiffness, and Impact
Strength for IPS Schedule 40 Series
Nominal Pipe Wall Thickness, Pipe Stiffness, Impact Strength,
Size in. lbf/in. ft·lbf
1 ⁄4 0.140 600 40
1 ⁄2 0.145 600 50
2 0.154 300 80
3 0.216 300 100
3 ⁄2 0.226 250 100
4 0.237 200 100
5 0.258 120 100
6 0.280 120 120
8 0.322 100 120
10 0.365 60 120
12 0.406 50 120
A
The maximum wall thickness shall not be greater than 1.25 times the minimum
wall thickness.
F891 − 24
A
TABLE 2 Minimum Wall Thickness for PS Series or Sewer and Drain Series for Minimum Pipe Stiffness
Wall Thickness, in.
Nominal
PS Series Sewer and Drain Series
Pipe Size
PS 25 PS 50 PS 100 PS 12.5 PS 25 PS 50 PS 100
2 . . . . . . 0.100 . . . . . . . . . . . .
3 . . . 0.103 0.130 . . . . . . 0.100 0.120
3 ⁄2 0.100 0.118 0.148 . . . . . . . . . . . .
4 0.106 0.133 0.167 . . . 0.100 0.124 0.156
5 0.131 0.164 0.206 . . . . . . . . . . . .
6 0.156 0.195 0.245 0.118 0.148 0.185 0.232
8 . . . . . . . . . . . . 0.198 0.248 0.310
10 . . . . . . . . . . . . . . . 0.310 0.388
12 . . . . . . . . . . . . . . . 0.369 0.462
15 . . . . . . . . . . . . . . . 0.452 0.565
18 . . . . . . . . . . . . . . . 0.548 0.691
A
The maximum wall thickness shall not be greater than 1.25 times the minimum wall thickness.
NOTE 5—This specification does not include requirements for pipe and fittings intended to be used to vent combustion gases.
5. Material
5.1 Material Specification—The PVC material for all layers shall conform to the requirements prescribed in Specification D4396
with a cell class of 11432. PVC material, which has a higher cell class than those listed, is acceptable.
5.2 Rework Material—The manufacturer shall use only his own clean rework pipe material conforming with these cell class
requirements. It shall be used only in the core layer if it contains any residual blowing agent. The pipe produced shall meet all
requirements of this specification.
5.3 Cellular Material—Cellular PVC used in the core layer shall be of a closed cell structure when tested in accordance with 6.3.6.
6. Requirements
6.1 Workmanship—The pipe shall be homogeneous throughout and free of visible cracks, holes, foreign inclusions, or other
defects. The pipe shall be as uniform as commercially practicable in color, opacity, density, and other physical properties.
6.2 Dimensions and Tolerances:
6.2.1 Outside Diameter—The outside diameter and tolerances for the IPS Schedule 40 series, PS series, and the sewer and drain
series shall meet the requirements of Table 3 when measured in accordance with Test Method D2122. The tolerances for
out-of-roundness shall apply to the pipe prior to shipment.
TABLE 3 Outside Diameter and Tolerances
Outside Diameter Out-of-Roundness Maxi-
mum Diameter Minus
Tolerance on Average
IPS Schedule 40
Nominal Pipe Size
Sewer and Drain
Minimum Diameter, in.
Outside Diameter, in.
Series, in. PS
Series, in.
Series, in.
1 ⁄4 1.660 . . . ±0.005 0.060
1 ⁄2 1.900 . . . ±0.006 0.060
2 2.375 . . . ±0.006 0.060
3 3.500 3.250 ±0.008 0.060
3 ⁄2 4.000 . . . ±0.008 0.100
4 4.500 4.215 ±0.009 0.100
5 5.563 . . . ±0.010 0.100
6 6.625 6.275 ±0.011 0.100
8 8.625 8.400 ±0.015 0.150
10 10.750 10.500 ±0.015 0.150
12 12.750 12.500 ±0.015 0.150
15 . . . 15.300 ±0.023 0.150
18 . . . 18.700 ±0.028 0.200
F891 − 24
6.2.2 Wall Thickness—The wall thickness for the IPS Schedule 40 series shall equal or exceed the minimum dimensions in Table
1, and for the PS series and sewer and drain series it shall equal or exceed the minimum dimensions in Table 2, when measured
in accordance with Test Method D2122.
6.2.3 Length—The pipe length may be 10 or 20 ft with a tolerance on length of + ⁄2, −0 in., unless otherwise specified.
6.3 Performance Requirements:
6.3.1 Pipe Stiffness—The minimum pipe stiffness values at 5 % deflection when measure in accordance with Test Method D2412,
shall equal or exceed the value in Table 1 for IPS Schedule 40 series, or the value in Table 2 or PS series and sewer and drain series.
Three specimens shall be tested. If all three meet this requirement, the sample meets this requirement. If one or two fail, additional
testing shall be conducted in accordance with 6.3.1.1. If all three fail, the sample does not meet the requirement.
6.3.1.1 Pipe Stiffness and Lower Confidence Limit—In the event that one or two of the specimens tested in 6.3.1 fail to meet the
minimum requirement, the average pipe stiffness of 11 specimens shall meet or exceed the minimum requirement given in Table
1 for IPS Schedule 40 series pipe, and Table 2 for PS Series and Sewer and Drain pipe. The 99 % lower confidence limit (LCL)
shall be within 15 % of the average value. The LCL shall be calculated using the Student’s “t” distribution, with N-1 degrees of
freedom, where N is the number of specimens (11). The critical t value shall be used to at least three significant digits. Alternatively,
if the LCL exceeds the minimum PS requirement in the applicable table, but is not within 15 % of the average, the sample meets
the requirements of the pipe stiffness testing. The 11 specimens include the three tested under 6.3.1, and an additional eight with
rotation by 35°, as specified in D2412, continuing throughout the remaining specimens.
The LCL based on testing eleven specimens is calculated as follows:
LCL 5 avg PS 2 2.76 std. dev. /= N
~ ! $ ~ ! ~ !%
where:
N = 11
(avg PS) = [∑(PS )]/(11)
i
2 2 1/2
PS 2 PS /N
(std.dev.) = ~ !
( (
F G
N21
The 15 % requirement is calculated as follows:
avg 2 LCL / avg ×100 # 15 %
~ ! ~ !
NOTE 6—The 5 % deflection criteria is arbitrarily selected for testing convenience. It should not be considered as a limitation with respect to in-use
deflection. The engineer is responsible for establishing the acceptable deflection limit.
NOTE 7—The strength and load-carrying capabilities of plastic pipe are measured and reported as pipe stiffness, which is determined in accordance with
Test Method D2412. The term “crushing strength” is not applicable to plastic piping.
6.3.2 Pipe Flattening—There shall be no evidence of cracking, delamination, or rupture when pipe is deflected 60 % of the initial
inside diameter, when tested in accordance with Test Method D2412. Three specimens shall be tested and all shall pass.
NOTE 8—This test is intended only for use as a quality control test, and not as a simulated service test.
6.3.3 Impact Resistance—The minimum impact resistance, when tested at the time of manufacture, shall comply with Table 1 for
IPS Schedule 40 series and Table 4 for the PS series and sewer and drain series. Test in accordance with Test Method D2444, using
Tup B and Holder B. Use a 20-lb (9.1-kg) tup for testing pipe sizes 4 in. and smaller and a 30-lb (13.6-kg) tup for pipe sizes larger
than 4 in.
6.3.3.1 Test 10 specimens. When 9 or 10 specimens pass, accept the lot. When 2 or more specimens fail, test 10 additional
specimens. When 17 of 20 specimens tested pass, accept the lot. When 4 or more of 20 specimens fail, test 20 additional specimens.
When 32 of 40 specimens pass, accept the lot. When 9 or more of 40 specimens fail, the lot does not meet the requirements of
this specification.
6.3.3.2 Failure of the test specimen shall be shattering or any crack or break extending entirely through the pipe wall and visible
to the unaided eye.
F891 − 24
TABLE 4 Minimum Impact Strength for PS Series or Sewer and
Drain Series
Minimum Impact Strength, ft·lbf
Nominal Pipe
Size
PS 12.5 PS 25 PS 50 PS 100
2 . . . . . . . . . 80
3 . . . 80 80 100
3 ⁄2 . . . 80 80 100
4 . . . 80 100 100
5 . . . 100 100 100
6 70 100 100 120
8 . . . 140 140 140
10 . . . 160 160 160
12 . . . 200 200 200
15 . . . . . . 220 . . .
18 . . . . . . 220 . . .
6.3.4 Bond—The bond between layers shall be strong and uniform. It shall not be possible to separate any two layers with a probe
or the point of a knife blade so that the layers separate cleanly, nor shall separation of the bond occur between layers during testing
performed under the requirements of this specification.
6.3.5 Extrusion Quality—The pipe shall meet the requirements of Test Method D2152.
6.3.6 Cellular Structure—The core layer of cellular core pipe shall not allow the passage of water when tested at 10 6 1 psig for
a minimum of 30 minutes. The test sample shall be 18 6 0.125 in. long. Create a seal on the O.D. and the I.D. of the pipe near
one end in a manner that permits the exposed core to be subjected to water pressure (Note 9). Any sign of water emanating from
the core at the opposite end after 30 minutes is indication of an open cell structure and the specimen does not meet the requirements
of this specification.
NOTE 9—The method of sealing against the I.D. and O.D. of the pipe is not specified, as several acceptable methods are available. One such method uses
an elastomeric no-hub adapter clamped to the O.D. and pneumatic or mechanical test plug to seal the I.D.
6.4 Other Requirements:
6.4.1 Joining—Coextruded poly(vinyl chloride) PVC plastic pipe produced in IPS Schedule 40 series and PS series are joined
using fittings meeting the requirements of Specifications D2665, D3311, or F512. Fittings meeting the requirements of
Specifications D2729, D3034, or F789 are used with the sewer and drain series, and Specification F545 are permitted for all series.
6.4.2 Solvent Cement—In the assembly of solvent cement joints, the safety requirements of Practice F402 shall be followed and
the joint shall be assembled following Practice D2855, using a cleaner or primer.
6.4.3 Gaskets—Elastomeric seals (gaskets) shall meet the requirements of Specification F477.
6.4.4 Lubricant—The lubricant used for assembly shall have no detrimental effect on the gasket or on the pipe or fitting.
6.4.5 Gasket Joints—Gasket joints shall comply with Specification D3212 and be designed so that the gasket inside the pipe will
be compressed radially on the pipe spigot, when assembled, to form a water-tight seal.
6.4.6 Gasket Displacement—The joint shall be designed to avoid displacement of the gasket when installed. The assembly of the
joint shall be in accordance with the manufacturer’s recommendation.
7. Sampling and Conditioning
7.1 Sampling—The selection of the sample or samples of pipe shall be as agreed upon by the purchaser and seller. In case of no
prior agreement, any sample selected by the testing lab shall be deemed adequate.
7.2 Conditioning:
7.2.1 For referee purposes, condition the specimens prior to test at 73 °F 6 4 °F (23 °C 6 2°C) and 50 % 6 10 % relative
humidity in accordance with Practice D618, Procedure A.
F891 − 24
7.2.2 For routine quality control testing, condition the specimens at the temperature and humidity of the manufacturer’s testing
facility for not less than 1 h or until the specimens are at the room temperature.
7.3 Test Conditions:
7.3.1 For referee purposes, conduct tests in the standard laboratory atmosphere of 73 °F 6 4 °F (23 °C 6 2 °C) and 50 % 6 10 %
relative humidity.
7.3.2 For routine quality control testing, conduct tests at the room temperature and humidity of
...