ASTM D3676-18

Standard Specification for Rubber Cellular Cushion Used for Carpet or Rug Underlay

ABSTRACT
This specification covers material and dimensional requirements for high-density rubber cellular cushion adhered to carpet, rugs, or various substrates intended for use as a separate underlay. However, this specification does not include requirements for burning characteristics. Material covered in this specification comprises Class A and Class B flexible, cellular, high-density rubber. Tests for compression set, compression resistance or compression force deflection, delaminations strength, tensile strength, and accelerated aging shall be performed and shall conform to the requirements specified.
SIGNIFICANCE AND USE
5.1 The purpose of this specification is to provide meaningful tests for rubber cellular cushion used for carpet or rug underlay.
SCOPE
1.1 This specification covers high-density cellular rubber adhered to carpet and rugs. This specification can also be applied to various substrates, such as blown sponge rubber, used independently as carpet underlay.  
1.2 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.
Note 1: There is no known ISO equivalent to this standard.  
1.3 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-Jul-2018
• ICS: 83.100 - Cellular materials
• ICS: 97.150 - Floor coverings
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.22 - Cellular Materials - Plastics and Elastomers

Relations

• Replaces: ASTM D3676-13 - Standard Specification for Rubber Cellular Cushion Used for Carpet or Rug Underlay
• Effective Date: 01-Aug-2018
• Refers: ASTM D883-24 - Standard Terminology Relating to Plastics
• Effective Date: 01-Feb-2024
• Refers: ASTM D883-23 - Standard Terminology Relating to Plastics
• Effective Date: 01-Nov-2023
• Refers: ASTM D883-20 - Standard Terminology Relating to Plastics
• Effective Date: 01-Jan-2020
• Refers: ASTM D883-19c - Standard Terminology Relating to Plastics
• Effective Date: 01-Aug-2019
• Refers: ASTM D883-19a - Standard Terminology Relating to Plastics
• Effective Date: 15-Apr-2019
• Refers: ASTM D883-19 - Standard Terminology Relating to Plastics
• Effective Date: 01-Feb-2019
• Refers: ASTM D883-18a - Standard Terminology Relating to Plastics
• Effective Date: 01-Dec-2018
• Refers: ASTM D883-18 - Standard Terminology Relating to Plastics
• Effective Date: 01-Nov-2018
• Refers: ASTM D883-17 - Standard Terminology Relating to Plastics
• Effective Date: 15-Aug-2017
• Refers: ASTM D3574-17 - Standard Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
• Effective Date: 01-Mar-2017
• Refers: ASTM D3574-16 - Standard Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
• Effective Date: 01-Nov-2016
• Refers: ASTM D6576-13 - Standard Specification for Flexible Cellular Rubber Chemically Blown
• Effective Date: 15-Nov-2013
• Refers: ASTM D883-12e1 - Standard Terminology Relating to Plastics
• Effective Date: 15-Nov-2012
• Refers: ASTM D3574-11 - Standard Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
• Effective Date: 01-Dec-2011

Overview

ASTM D3676-18 is the authoritative standard specification for rubber cellular cushion products used as underlays for carpets and rugs. Developed by ASTM International, this standard outlines material and dimensional requirements for high-density, flexible rubber cushions adhered to or used under flooring surfaces. Its primary aim is to set quality assurance benchmarks for both manufacturers and users, facilitating reliable performance in commercial, residential, and public facility installations.

This specification covers two main classes:

• Class A - Designed for moderate traffic in residential settings and dwelling units.
• Class B - Intended for heavy traffic areas such as lobbies, corridors, and other public spaces.

The standard clearly defines test procedures and criteria but does not address burning characteristics; separate flammability standards may apply.

Key Topics

Material Requirements and Classifications

• Applies to high-density rubber cushions, including both open cell (sponge rubber) and closed cell structures.
• Specifies minimum mass per unit area, thickness, and density for cushions, depending on the class.
• Differentiates between flexible, cellular materials (as defined in ASTM D883) for resilience and performance.

Physical and Mechanical Properties

• Details standardized test methods for evaluating properties such as:
  • Compression set (ASTM D395)
  • Compression resistance and deflection (ASTM D1056, D3574)
  • Delamination strength (ASTM D751, Federal Standard 191)
  • Tensile strength
  • Accelerated aging (ASTM D573)

Sampling and Testing

• Procedures for representative sample selection and preparation.
• Directions for area density, thickness, and volume density measurements.

Acceptance and Inspection

• Guidelines for pre-shipment testing at place of manufacture.
• Procedures for resampling and final product rejection if test requirements are not met.

Applications

ASTM D3676-18 is widely used by:

• Carpet and rug manufacturers to ensure quality and durability of underlays used in their products.
• Construction and flooring professionals in residential, commercial, and high-traffic public environments to specify underlayments that meet performance and longevity requirements.
• Facilities management for retrofits or new installations, promoting comfort, noise reduction, and extended carpet life.
• Procurement specialists seeking verified, reliable material for use in public spaces, hotels, care facilities, and residential buildings.

By adhering to this standard, stakeholders ensure that rubber carpet underlays deliver essential resilience, provide proper support, and withstand environmental and usage stresses.

Related Standards

• ASTM D1056 - Specification for flexible cellular rubber products, often referenced for compression and density testing protocols.
• ASTM D395 - Methods for testing compression set in rubber materials.
• ASTM D3574 - Slab, bonded, and molded urethane foam test methods, especially Compression Force Deflection (CFD) testing.
• ASTM D873 - Test method for evaluating rubber deterioration under accelerated aging.
• Flammability Standards (FFC1-70, FF2-70) - Govern surface flammability of carpets and rugs, relevant when underlayments are integral.
• Federal Standard 191 - Textile test methods, including those for delamination and strength.

There is currently no ISO equivalent to ASTM D3676-18.

Practical Value

Utilizing ASTM D3676-18 helps ensure that rubber underlay cushions under carpets or rugs meet rigorous, internationally recognized quality and durability standards. This results in:

• Enhanced underfoot comfort and support
• Improved carpet longevity and protection from substrate wear
• Reliable product performance across all intended installation scenarios
• Confidence in material sourcing, testing, and specification compliance

By referencing this standard, manufacturers and buyers help maintain consistency, safety, and performance across carpet and rug installations in diverse environments.

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:D3676 −18
Standard Specification for
Rubber Cellular Cushion Used for Carpet or Rug Underlay
This standard is issued under the fixed designation D3676; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2.2 Federal Standard:
Fed. Std. No. 191Textile Test Methods, Method5100—
1.1 This specification covers high-density cellular rubber
Breaking Strength and Elongation of Woven Cloth; Grab
adhered to carpet and rugs. This specification can also be
Method
applied to various substrates, such as blown sponge rubber,
used independently as carpet underlay.
3. Terminology
1.2 This standard does not purport to address all of the
3.1 Definitions—For definitions used in this test method,
safety concerns, if any, associated with its use. It is the
refer to Terminology D883.
responsibility of the user of this standard to establish appro-
3.2 Definitions of Terms Specific to This Standard:
priate safety, health, and environmental practices and deter-
3.2.1 rubber—a material that is capable of recovering from
mine the applicability of regulatory limitations prior to use.
largedeformationsquicklyandforcibly,andcanbe,oralready
NOTE 1—There is no known ISO equivalent to this standard.
is, modified to a state in which it is essentially insoluble (but
1.3 This international standard was developed in accor- can swell) in boiling solvent (such as benzene, methyl ethyl
dance with internationally recognized principles on standard-
ketone, and ethanol-toluene azeotrope).
ization established in the Decision on Principles for the
3.2.2 cellular material—a generic term for materials con-
Development of International Standards, Guides and Recom-
taining many cells (either open or closed, or both) dispersed
mendations issued by the World Trade Organization Technical
throughout the mass.
Barriers to Trade (TBT) Committee.
3.2.3 flexible cellular material—a flexible cellular organic
polymeric material that will not rupture within 60 s when a
2. Referenced Documents
specimen 8 by 1 in. (200 by 25 by 25 mm) is bent around a
2.1 ASTM Standards:
1-in. (25-mm) diameter mandrel at a uniform rate of 1 lap/5 s
D395Test Methods for Rubber Property—Compression Set
intheformofahelixatatemperaturebetween65and85°F(18
D573Test Method for Rubber—Deterioration in an Air
and 29°C).
Oven
3.2.4 open cell—a product whose cells are not totally
D751Test Methods for Coated Fabrics
enclosed by its walls and open to the surface, either directly or
D883Terminology Relating to Plastics
by interconnecting with other cells.
D1056 Specification for Flexible Cellular Materials—
3.2.5 closed cell—aproductwhosecellsaretotallyenclosed
Sponge or Expanded Rubber
by its walls and hence not interconnecting with other cells.
D3574Test Methods for Flexible Cellular Materials—Slab,
3.2.6 sponge rubber—cellular rubber consisting predomi-
Bonded, and Molded Urethane Foams
nantly of open cells made from a solid rubber compound.
D3767Practice for Rubber—Measurement of Dimensions
D6576Specification for Flexible Cellular Rubber Chemi-
4. Summary of Test Method
cally Blown
4.1 This specification provides material and dimensional
requirements and test methods for specific properties of com-
pression set, compression resistance or compression force
This specification is under the jurisdiction of ASTM Committee D20 on
deflection, delamination strength, and accelerated aging.
Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular
Materials - Plastics and Elastomers.
NOTE 2—This specification does not include requirements for burning
Current edition approved Aug. 1, 2018. Published August 2018. Originally
characteristics. It shall be noted that Flammable Fabrics Act Regulations
approved in 1978. Last previous edition approved in 2013 as D3676- 13. DOI:
FF1-70, Standard for the Surface Flammability of Carpets and Rugs, and
10.1520/D3676-18.
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 AvailablefromStandardizationDocumentsOrderDesk,Bldg.4SectionD,700
the ASTM website. Robbins Ave., Philadelphia, PA 19111–5094, Attn: NPODS.
*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
D3676−18
FF2-70, Standard for the Surface Flammability of Small Carpets and
8.3 Mark off 150 mm from the outer edges of the sample
Rugs,4 shall be applicable for carpets and rugs with integral backing of
andcutallspecimensfrominsidetheselines.Dividethisinside
rubber cellular cushion.
width into three approximately equal parts. After cutting the
specimens, identify the originating area on the foam side.
5. Significance and Use
8.4 Cut three 50 61mmby150 6 3-mm specimens from
5.1 The purpose of this specification is to provide meaning-
the sample, one from each side area and one from the center
ful tests for rubber cellular cushion used for carpet or rug
and label each specimen distinguishing as such. Cut the long
underlay.
dimension parallel to the warp threads of the carpet or rug, if
applicable.
6. Classification
8.5 Die-cut six 100 62mmby100 6 2-mm specimens,
6.1 The following classes of flexible, cellular, high-density
two from each side area and two from the center. Die-cut the
rubbereitheradheredtocarpetsandrugsorusedindependently
specimens with the foam side against the cutting die.
as carpet underlay are covered.
8.6 Cut at least one 50 61mmby100 6 2-mm specimen
6.1.1 Class A, for moderate traffic use within one and two
from the remaining sample.
family, multi-family, and care-type dwelling units. Moderate
traffic areas are areas such as living rooms, dining rooms,
9. Test Methods
bedrooms, and recreation rooms.
6.1.2 Class B, for heavy traffic use for public areas such as 9.1 Unless specifically stated otherwise, all tests shall be
made in accordance with the methods specified in Sections 11
lobbies and corridors of multifamily and care-type facilities;
entrances, stairways, and elevators. –18.
10. Inspection and Rejection
7. Physical Requirements
10.1 All tests and inspection shall be made at the place of
7.1 The material shall conform to the requirements for
manufacture prior to shipment unless otherwise specified.
physical properties prescribed in Table 1.
10.2 It is acceptable for any material that fails in one or
8. Sampling and Sample Preparation
more of the test requirements to be resampled from another
area and retested. Failure of the retest shall be cause for final
8.1 Select representative samples of the lot being examined
rejection.
at random as required.
10.3 The manufacturer shall certify that the material is in
8.2 Each sample shall consist of a 200 6 10-mm wide strip
compliance with this specification.
taken across the full width of the finished rug, carpet, or
underlayment, or other substrate. For narrow products such as
11. Test Conditions
runners,itwilloccasionallybenecessarytouseastrip300mm
11.1 Condition the specimens for a minimum of 24 h at 23
or more to furnish all the test specimens. If the product is not
62°Cand50 610%relativehumidity.Ifotherconditionsare
homogeneous across the full width, reject the sample and
used, note these conditions in the report.
obtain another sample. Prior to cutting, read the sample
requirements so as to plan the cutting pattern properly.
12. Area Density of Foam Backing
12.1 Procedure—Weigh the six 100 mm by 100-mm speci-
mens separately and record the mass to the nearest 0.01 g.
TABLE 1 Using suitable equipment, for example, an electric carving
knife and supporting guides, separate the foam backing from
Characteristic Class A Class B ASTM Method
the primary carpet backing by cutting at the line where the
Mass per unit area, min, 1.3 (38.0) 1.6 (46.0) Section 12 of D3676
textilecomponentmeetsthefoamcomponent.Cutascloselyas
2 2
kg/m (oz/yd )
possible without damaging the primary carpet backing. Keep
Thickness, min, mm (in.) 3 (0.12) 3 (0.12) Section 13 of D3676
the foam specimens for further tests. Remove any remaining
Density, min, kg/m 270 (17) 320 (20) Section 14 of D3676
(lb/ft )
foam from the primary carpet backing by brushing it with a
Compression Resist- 21 (3) 31 (4.5) Section 15 of D3676
stiff wire-bristle brush.Weigh each carpet specimen separately
ance, min, kPa (psi)
Constant deflection 15 15 D395, Method B with and record the mass to the nearest 0.01 g.
compression set, changes as in Section
12.2 Calculation—For each specimen, calculate the mass
max, % 16 of D3676
Delamination resistance, 350 (2) 350 (2) Section 17 of D3676
(M) of the foam as the difference between the total mass and
min, N/min (lbf/in.)
the mass of the carpet with foam backing removed. Report the
Accelerated aging Samples D573 with changes as
average of th
...

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: D3676 − 13 D3676 − 18
Standard Specification for
Rubber Cellular Cushion Used for Carpet or Rug Underlay
This standard is issued under the fixed designation D3676; 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 high-density cellular rubber adhered to carpet, rugs, or various substrates for use as separate
underlay. It is also acceptable to use this standard as a specification for separately blown sponge used carpet and rugs. This
specification can also be applied to various substrates, such as blown sponge rubber, used independently as carpet underlay.
1.2 This specification provides material and dimensional requirements and test methods for specific properties of compression
set, compression resistance or compression force deflection, delamination strength, and accelerated aging.
NOTE 1—This specification does not include requirements for burning characteristics. It shall be noted that Flammable Fabrics Act Regulations FF1-70,
Standard for the Surface Flammability of Carpets and Rugs, and FF2-70, Standard for the Surface Flammability of Small Carpets and Rugs, may be
applicable for carpets and rugs with integral backing of rubber cellular cushion.
1.2 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—There is no known ISO equivalent to this standard.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
D395 Test Methods for Rubber Property—Compression Set
D573 Test Method for Rubber—Deterioration in an Air Oven
D751 Test Methods for Coated Fabrics
D883 Terminology Relating to Plastics
D1056 Specification for Flexible Cellular Materials—Sponge or Expanded Rubber
D3574 Test Methods for Flexible Cellular Materials—Slab, Bonded, and Molded Urethane Foams
D3767 Practice for Rubber—Measurement of Dimensions
D6576 Specification for Flexible Cellular Rubber Chemically Blown
2.2 Federal Standard:
Fed. Std. No. 191 Textile Test Methods, Method 5100—Breaking Strength and Elongation of Woven Cloth; Grab Method
3. Terminology
3.1 Definitions—For definitions used in this test method, refer to Terminology D883.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 rubber—a material that is capable of recovering from large deformations quickly and forcibly, and can be, or already is,
modified to a state in which it is essentially insoluble (but can swell) in boiling solvent (such as benzene, methyl ethyl ketone, and
ethanol-toluene azeotrope).
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.22 on Cellular Materials - Plastics
and Elastomers.
Current edition approved April 15, 2013Aug. 1, 2018. Published April 2013August 2018. Originally approved in 1978. Last previous edition approved in 20072013 as
D3676 - 01.D3676 - 13. DOI: 10.1520/D3676-13.10.1520/D3676-18.
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.
Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111–5094, Attn: NPODS.
*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
D3676 − 18
3.2.2 cellular material—a generic term for materials containing many cells (either open or closed, or both) dispersed throughout
the mass.
3.2.3 flexible cellular material—a flexible cellular organic polymeric material that will not rupture within 60 s when a specimen
8 by 1 in. (200 by 25 by 25 mm) is bent around a 1-in. (25-mm) diameter mandrel at a uniform rate of 1 lap/5 s in the form of
a helix at a temperature between 65 and 85°F (18 and 29°C).
3.2.4 open cell—a product whose cells are not totally enclosed by its walls and open to the surface, either directly or by
interconnecting with other cells.
3.2.5 closed cell—a product whose cells are totally enclosed by its walls and hence not interconnecting with other cells.
3.2.6 sponge rubber—cellular rubber consisting predominantly of open cells made from a solid rubber compound.
4. Summary of Test Method
4.1 This specification provides material and dimensional requirements and test methods for specific properties of compression
set, compression resistance or compression force deflection, delamination strength, and accelerated aging.
NOTE 2—This specification does not include requirements for burning characteristics. It shall be noted that Flammable Fabrics Act Regulations FF1-70,
Standard for the Surface Flammability of Carpets and Rugs, and FF2-70, Standard for the Surface Flammability of Small Carpets and Rugs,4 shall be
applicable for carpets and rugs with integral backing of rubber cellular cushion.
5. Significance and Use
5.1 The purpose of this specification is to provide meaningful tests for rubber cellular cushion used for carpet or rug underlay.
6. Classification
6.1 The following classes of flexible, cellular, high-density rubber either adhered to carpets, rugs, and separate substrates carpets
and rugs or used independently as carpet underlay are covered.
6.1.1 Class A, for moderate traffic use within one and two family, multi-family, and care-type dwelling units. Moderate traffic
areas are areas such as living rooms, dining rooms, bedrooms, and recreation rooms.
6.1.2 Class B, for heavy traffic use for public areas such as lobbies and corridors of multifamily and care-type facilities;
entrances, stairways, and elevators.
7. Physical Requirements
7.1 The material shall conform to the requirements for physical properties prescribed in Table 1.
8. Sampling and Sample Preparation
8.1 Select representative samples of the lot being examined at random as required.
8.2 Each sample shall consist of a 200 6 10-mm wide strip taken across the full width of the finished rug, carpet, or
underlayment, or other substrate. For narrow products such as runners, it will occasionally be necessary to use a strip 300 mm or
more to furnish all the test specimens. If the product is not homogeneous across the full width, reject the sample and obtain another
sample. Prior to cutting, read the sample requirements so as to plan the cutting pattern properly.
8.3 Mark off 150 mm from the outer edges of the sample and cut all specimens from inside these lines. Divide this inside width
into three approximately equal parts. After cutting the specimens, identify the originating area on the foam side.
8.4 Cut three 50 6 1 mm by 150 6 3-mm specimens from the sample, one from each side area and one from the center. center
and label each specimen distinguishing as such. Cut the long dimension parallel to the warp threads of the carpet or rug, if
applicable.
8.5 Die-cut six 100 6 2 mm by 100 6 2-mm specimens, two from each side area and two from the center. Die-cut the specimens
with the foam side against the cutting die.
8.6 Cut at least one 50 6 1 mm by 100 6 2-mm specimen from the remaining sample.
9. Test Methods
9.1 Unless specifically stated otherwise, all tests shall be made in accordance with the methods specified in Sections 911 – 1618.
10. Inspection and Rejection
10.1 All tests and inspection shall be made at the place of manufacture prior to shipment unless otherwise specified.
10.2 It is acceptable for any material that fails in one or more of the test requirements to be resampled atfrom another area and
retested. Failure of the retest shall be cause for final rejection.
10.3 The manufacturer shall certify that the material is in compliance with this specification.
D3676 − 18
TABLE 1
Characteristic Class A Class B ASTM Method
Mass per unit area, min, 1.3 (38.0) 1.6 (46.0) Section 10 of D3676
2 2
kg/m (oz/yd )
Mass per unit area, min, 1.3 (38.0) 1.6 (46.0) Section 12 of D3676
2 2
kg/m (oz/yd )
Thickness, min, mm (in.) 3 (0.12) 3 (0.12) Section 11 of D3676
Thickness, min, mm (in.) 3 (0.12) 3 (0.12) Section 13 of D3676
Density, min, kg/m 270 (17) 320 (20) Section 12 of D3676
(lb/ft )
Density, min, kg/m 270 (17) 320 (20) Section 14 of D3676
(lb/ft )
Compression Resist- 21 (3) 31 (4.5) Section 13 of D3676
ance, min, kPa (psi)
Compression Resist- 21 (3) 31 (4.5) Section 15 of D3676
ance, min, kPa (psi)
Constant deflection 15 15 D395, Method B with
compression set, changes as in Section
max, % 14 of D3676
Constant deflection 15 15 D395, Method B with
compression set, changes as in Section
max, % 16 of D3676
Delamination resistance, 350 (2) 350 (2) Section 15 of D3676
min, N/min (lbf/in.)
Delamination resistance, 350 (2) 350 (2) Section 17 of D3676
min, N/min (lbf/in.)
Accelerated aging Samples D573 with changes as
shall pass in Section 16 of D3676
the stated
requirements
Accelerated aging Samples D573 with changes as
shall pass in Section 18 of D3676
the stated
requirements
Tensile strength, min, kPa 55 (8) 55 (8) D3574
(psi)
Compression Force — — D3574
Deflection, KPa (psi) — —
11. Test Conditions
11.1 Condition the specimens for a minimum of 24 h at 23 6 2°C and 50 6 10 % relative humidity. If other conditions are used,
note these conditions in the report.
12. Area Density of Foam Backing
12.1 Procedur
...