ASTM D3122-21

Standard Specification for Solvent Cements for Styrene-Rubber (SR) Plastic Pipe and Fittings

ABSTRACT
This specification provides general requirements for styrene-rubber solvent cements used in joining styrene-rubber (SR) plastic pipe and fittings. A recommended procedure for joining styrene-rubber pipe and fittings is given. The materials shall meet the required resin content, dissolution, viscosity, and lap shear strength.
SCOPE
1.1 This specification provides general requirements for styrene-rubber solvent cements to be used in joining styrene-rubber (SR) plastic pipe and fittings.  
1.2 A recommended procedure for joining styrene-rubber pipe and fittings is given in the appendix.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.4 The following safety hazards caveat pertains only to the test methods portion, Section 6, of this specification: 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.  
1.5 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-Oct-2021
• ICS: 83.180 - Adhesives
• Technical Committee: F17 - Plastic Piping Systems
• Drafting Committee: F17.20 - Joining

Relations

• Refers: ASTM F412-20 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Apr-2020
• Refers: ASTM E1953-20 - Standard Practice for Description of Thermal Analysis and Rheology Apparatus
• Effective Date: 15-Mar-2020
• Refers: ASTM F412-19 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Jan-2019
• Refers: ASTM D1600-18 - Standard Terminology for Abbreviated Terms Relating to Plastics (Withdrawn 2024)
• Effective Date: 01-Jan-2018
• Refers: ASTM F412-17a - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Aug-2017
• Refers: ASTM F412-17 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Feb-2017
• Refers: ASTM F412-16a - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 15-Nov-2016
• Refers: ASTM F412-16 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Aug-2016
• Refers: ASTM F412-15 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 01-Jun-2015
• Refers: ASTM F493-14 - Standard Specification for Solvent Cements for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe and Fittings
• Effective Date: 01-Nov-2014
• Refers: ASTM E1953-14 - Standard Practice for Description of Thermal Analysis and Rheology Apparatus
• Effective Date: 01-Mar-2014
• Refers: ASTM D1600-14 - Standard Terminology for Abbreviated Terms Relating to Plastics
• Effective Date: 01-Feb-2014
• Refers: ASTM D1600-13 - Standard Terminology for Abbreviated Terms Relating to Plastics
• Effective Date: 15-Apr-2013
• Refers: ASTM E1953-07(2013) - Standard Practice for Description of Thermal Analysis and Rheology Apparatus
• Effective Date: 01-Mar-2013
• Refers: ASTM F412-13 - Standard Terminology Relating to Plastic Piping Systems
• Effective Date: 15-Feb-2013

Overview

ASTM D3122-21 is the standard specification developed by ASTM International for solvent cements used with styrene-rubber (SR) plastic pipe and fittings. This specification sets general requirements for the composition, properties, and application of solvent cements utilized in joining SR plastic piping systems. The standard includes guidelines for material content, product performance, handling practices, labeling, and a recommended joining procedure. Adherence to ASTM D3122-21 ensures that solvent cements deliver reliable joint integrity, chemical resistance, and long-term performance in piping installations.

Key Topics

• Material Requirements: Solvent cements must be formulated from styrene-rubber (SR) plastic compounds that meet specific minimum content requirements for resin and rubber. Approved solvents include methyl ethyl ketone and toluene.
• Product Properties: Cements must exhibit satisfactory dissolution, viscosity, and lap shear strength, ensuring effective bonding and mechanical reliability. The standard specifies acceptable test methods and minimum performance values.
• Application Procedures: A recommended process for joining SR plastic pipe and fittings is provided, addressing surface preparation, cement application, and assembly techniques to maximize bond strength.
• Safety Guidance: The standard emphasizes the need for safe handling, ventilation, and appropriate labeling, especially given the flammability and potential hazards associated with solvent-based cements.
• Labeling and Quality: Containers must be properly labeled with product information, safety warnings, and certification claims. Manufacturers must ensure quality control and, upon request, supply documentation affirming compliance with the specification.

Applications

ASTM D3122-21 is primarily used in the fabrication and installation of non-pressure piping systems where styrene-rubber plastic pipe and fittings require dependable joining. Practical application areas include:

• Drainage Systems: Joining SR plastic pipes in residential, commercial, or industrial drainage installations.
• Wastewater and Vent Systems: Bonding pipes and fittings for waste disposal, vent lines, and similar plumbing applications.
• Repair and Maintenance: Providing an effective adhesive solution for repairing existing SR plastic piping networks.
• Fabrication of Custom Pipe Assemblies: Ensuring secure, chemically resistant joints in factory-assembled or field-assembled piping configurations.

By following ASTM D3122-21, contractors, manufacturers, and facility managers can trust the reliability and performance of SR solvent cements, resulting in leak-resistant joints and reduced maintenance requirements.

Related Standards

Several other ASTM standards are referenced or closely related to ASTM D3122-21, further supporting best practices for plastic piping systems and solvent cement usage:

• ASTM D2852: Specification for Styrene-Rubber (SR) Plastic Drain Pipe and Fittings, which defines requirements for the pipes and fittings joined using D3122-compliant cements.
• ASTM D1084: Test Methods for Viscosity of Adhesives, guiding consistent evaluation of solvent cement fluidity.
• ASTM F402: Practice for Safe Handling of Solvent Cements, Primers, and Cleaners Used for Joining Thermoplastic Pipe and Fittings, providing safety procedures.
• ASTM F412: Terminology Relating to Plastic Piping Systems.
• ASTM F493: Specification for Solvent Cements for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe and Fittings, for users of other plastic piping solutions.

Summary

ASTM D3122-21 offers comprehensive requirements for solvent cements used with styrene-rubber plastic pipe and fittings, supporting durable, effective, and safe pipe joining. Adoption of this standard by manufacturers, installers, and specifiers promotes consistency, regulatory compliance, and product safety in SR piping system applications. For optimal performance, always follow the procedures and recommendations outlined in the latest version of ASTM D3122.

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: D3122 −21 An American National Standard
Standard Specification for
Solvent Cements for Styrene-Rubber (SR) Plastic Pipe and
Fittings
This standard is issued under the fixed designation D3122; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* E1953 Practice for Description of Thermal Analysis and
Rheology Apparatus
1.1 This specification provides general requirements for
F402 Practice for Safe Handling of Solvent Cements,
styrene-rubber solvent cements to be used in joining styrene-
Primers, and Cleaners Used for Joining Thermoplastic
rubber (SR) plastic pipe and fittings.
Pipe and Fittings
1.2 A recommended procedure for joining styrene-rubber
F412 Terminology Relating to Plastic Piping Systems
pipe and fittings is given in the appendix.
F493 Specification for Solvent Cements for Chlorinated
Poly(Vinyl Chloride) (CPVC) Plastic Pipe and Fittings
1.3 The values stated in SI units are to be regarded as
standard. The values given in parentheses after SI units are
provided for information only and are not considered standard. 3. Terminology
1.4 The following safety hazards caveat pertains only to the
3.1 Definitions—Definitions are in accordance with Termi-
test methods portion, Section 6, of this specification: This
nology F412, and abbreviations are in accordance with Termi-
standard does not purport to address all of the safety concerns,
nology D1600, unless otherwise specified.
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety, health, and
4. General Requirements
environmental practices and determine the applicability of
4.1 The solvent cement shall be a solution of styrene-rubber
regulatory limitations prior to use.
(SR) plastic compound or resin meeting the following require-
1.5 This international standard was developed in accor-
ments.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the 4.1.1 The SR plastic compounds or resin shall contain at
least 50 % styrene plastics, combined with rubbers to a
Development of International Standards, Guides and Recom-
minimum rubber content of 5 %, and compounding materials
mendations issued by the World Trade Organization Technical
such as antioxidants and lubricants, and may contain up to
Barriers to Trade (TBT) Committee.
15 % acrylonitrile combined in the styrene plastics or rubbers,
2. Referenced Documents orboth.Therubbersshallbeofthepolybutadieneorbutadiene-
2 styrene type, or both, with a maximum styrene content of 25 %
2.1 ASTM Standards:
or nitrile type or both. The combined styrene plastics and
D618 Practice for Conditioning Plastics for Testing
rubber content shall be not less than 90 %. No filler may be
D1084 Test Methods for Viscosity of Adhesives
used. (See Specification D2852.)
D1600 Terminology forAbbreviatedTerms Relating to Plas-
tics
4.2 Either virgin or clean rework material may be used
D2852 Specification for Styrene-Rubber (SR) Plastic Drain
provided that the rework material is generated from the solvent
Pipe and Fittings
cement manufacturer’s own production, is compatible with
virgin material, and will produce a cement that meets the
requirements of this specification.
This specification is under the jurisdiction ofASTM Committee F17 on Plastic
Piping Systems and is the direct responsibility of Subcommittee F17.20 on Joining. 4.3 The cement shall be free-flowing and shall not contain
Current edition approved Nov. 1, 2021. Published November 2021. Originally
lumps, macroscopic undissolved particles, or any foreign
approved in 1972. Last previous edition approved in 2015 as D3122 – 15. DOI:
matter that will adversely affect the ultimate joint strength or
10.1520/D3122-21.
2 chemical resistance of the cement.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
4.4 The cement shall show no gelatin. It shall show no
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. stratification or separation that cannot be removed by stirring.
*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
D3122 − 21
4.5 The cement shall be a solution of styrene-rubber (SR) 6.3.1 Apparatus:
plastic compound or resin meeting the requirements of 4.1.1 6.3.1.1 Ointment Tins—StyleNo.12,30mL(1oz)allmetal.
dissolved in one of the following solvents: 6.3.1.2 Vacuum Oven.
4.5.1 Methyl ethyl ketone. 6.3.1.3 Desiccator.
4.5.2 Toluene. 6.3.1.4 Analytical Balance.
6.3.2 Procedure—Stir the sample thoroughly with a spatula
NOTE 1—It is recommended that solvent cements made to this speci-
before weighing (Note 4). Weigh 3.0 6 0.5 g (0.106 oz. +
fication not be orange since that color is being recommended for use with
0.018 oz.) of the sample to the nearest 1 mg into a tared
CPVC solvent cement under Specification F493.
ointment tin. Place tin into the vacuum oven (Note 5) and heat
5. Detail Requirements
at 120 °C (248 °F) for 45 min (Note 6). Vacuum must be
5.1 Resin Content—The SR resin compound shall be 20 %
continually in operation to draw off flammable solvents and
minimum by mass with methyl ethyl ketone as the solvent or
should be maintained at 15 mm (0.60 in.) maximum. Remove
shall be 15 % minimum by mass with toluene as the solvent,
the tin from the oven and cap immediately. Place in a
when tested in accordance with 6.3.
desiccator until cooled to room temperature. Weigh the tin and
dried sample to the nearest 1 mg.
5.2 Dissolution—The cement shall be capable of dissolving
an additional 10 % by mass of styrene-rubber (SR) resin or
NOTE 4—This material is usually nonhomogeneous and shall be
compound meeting the requirements of 4.1.1 at 23 °C 62°C thoroughly stirred before weighing. The weighing shall also be accom-
plished quickly to avoid loss of solvent by volatilization.
(73.4 °F 6 3.6 °F) without evidence of gelation.
NOTE 5—The use of a vacuum oven is mandatory for drying the
5.3 Viscosity—The minimum viscosity at 23 °C 6 2°C
specimen because this oven has no exposed heating surface nor an open
(73.4 °F 6 3.6 °F) shall be 90 mPa·s (90 cP) when tested in flame, thus avoiding the danger of flashing. The oven also provides an
open vacuum to exhaust solvent fumes.
accordance with 6.2.
NOTE 6—The specimen shall be left in the oven for 45 min and no
NOTE 2—Cements approaching the minimum viscosity of this specifi- longer. Specimens left in for1hor more show a definite increase in
cation generally are not recommended for noninterference-type fit (where
weight.
gap exists between the pipe and fitting socket).
6.3.3 Calculation—Calculate the percentage total solids,
5.4 Lap Shear Strength:
TS, as follows:
5.4.1 The minimum lap shear strength of a cement made
TS,% 5 ~~B 2 A!/~C 2 A!! 3100
with methyl ethyl ketone as the solvent when tested in
accordance with 6.4 shall be 3.5 MPa (500 psi) after a 16-h where:
curing time and 6.0 MPa (900 psi) after a 48-h curing time.
A = weight of ointment tin,
5.4.2 The minimum lap shear strength of a cement made
B = weight of tin and specimen after drying, and
with toluene as the solvent when tested in accordance with 6.4
C = weight of tin and specimen before drying.
shallbe1.6MPa(230psi)aftera16-hcuringtimeand2.4MPa
6.3.4 Precision—Duplicate samples shall be tested for best
(350 psi) after a 48-h curing time.
results. Duplicate results obtained by the same analyst, on the
same material, on the same day, in the same laboratory are
NOTE 3—These values should not be used for designing pipe joints.
suspect if they differ by more than 0.52 % absolute. This
6. Test Methods
procedure has a standard deviation of 0.13.
6.1 The properties enumerated in this specification shall be
6.4 Lap Shear Strength:
determined in accordance with the following methods:
6.4.1 Number of Specimens—Aminimum of five specimens
6.1.1 Conditioning—Condition the test specimens at 23 °C
shall be tested for the requirement specified in 5.4.
6 2 °C (73.4 °F 6 3.6 °F) for not less than 40 h prior to test in
6.4.2 Cut 25 mm by 25 mm (1 in. by 1 in.) and 25 mm by
accordance with Procedure A of Practice D618, for those tests
50 mm (1 in. by 2 in.) sections from a 6 mm ( ⁄4 in.) thick rigid
where conditioning is required.
styrene-rubber plastic (SR) sheet. One section of each size is
6.1.2 Test Conditions—Conduct tests at 23 °C 6 2°C
required for each test specimen (Fig. 1).
(73.4 °F 6 3.6 °F), unless otherwise specified in the test
methods or in this specification.
6.2 Viscosity:
6.2.1 The samples for test shall be representative of the
material under consideration. One sample for every batch shall
be tested in accordance with 6.2.2 unless otherwise agreed
upon by the supplier and the
...

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: D3122 − 15 D3122 − 21 An American National Standard
Standard Specification for
Solvent Cements for Styrene-Rubber (SR) Plastic Pipe and
Fittings
This standard is issued under the fixed designation D3122; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification provides general requirements for styrene-rubber solvent cements to be used in joining styrene-rubber (SR)
plastic pipe and fittings.
1.2 A recommended procedure for joining styrene-rubber pipe and fittings is given in the appendix.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. after
SI units are provided for information only and are not considered standard.
1.4 The following safety hazards caveat pertains only to the test methods portion, Section 6, of this specification: 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.
1.5 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:
D618 Practice for Conditioning Plastics for Testing
D1084 Test Methods for Viscosity of Adhesives
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2852 Specification for Styrene-Rubber (SR) Plastic Drain Pipe and Fittings
E1953 Practice for Description of Thermal Analysis and Rheology Apparatus
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
F493 Specification for Solvent Cements for Chlorinated Poly(Vinyl Chloride) (CPVC) Plastic Pipe and Fittings
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.20 on Joining.
Current edition approved Aug. 1, 2015Nov. 1, 2021. Published August 2015November 2021. Originally approved in 1972. Last previous edition approved in 20092015
as D3122 – 95D3122 – 15. (2009). DOI: 10.1520/D3122-15.10.1520/D3122-21.
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.
*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
D3122 − 21
3. Terminology
3.1 Definitions—Definitions are in accordance with Terminology F412, and abbreviations are in accordance with Terminology
D1600, unless otherwise specified.
4. General Requirements
4.1 The solvent cement shall be a solution of styrene-rubber (SR) plastic compound or resin meeting the following requirements.
4.1.1 The SR plastic compounds or resin shall contain at least 50 % styrene plastics, combined with rubbers to a minimum rubber
content of 5 %, and compounding materials such as antioxidants and lubricants, and may contain up to 15 % acrylonitrile combined
in the styrene plastics or rubbers, or both. The rubbers shall be of the polybutadiene or butadiene-styrene type, or both, with a
maximum styrene content of 25 % or nitrile type or both. The combined styrene plastics and rubber content shall be not less than
90 %. No filler may be used. (See Specification D2852.)
4.2 Either virgin or clean rework material may be used provided that the rework material is generated from the solvent cement
manufacturer’s own production, is compatible with virgin material, and will produce a cement that meets the requirements of this
specification.
4.3 The cement shall be free-flowing and shall not contain lumps, macroscopic undissolved particles, or any foreign matter that
will adversely affect the ultimate joint strength or chemical resistance of the cement.
4.4 The cement shall show no gelatin. It shall show no stratification or separation that cannot be removed by stirring.
4.5 The cement shall be a solution of styrene-rubber (SR) plastic compound or resin meeting the requirements of 4.1.1 dissolved
in one of the following solvents:
4.5.1 Methyl ethyl ketone.
4.5.2 Toluene.
NOTE 1—It is recommended that solvent cements made to this specification not be orange since that color is being recommended for use with CPVC
solvent cement under Specification F493.
5. Detail Requirements
5.1 Resin Content—The SR resin compound shall be 20 % minimum by mass with methyl ethyl ketone as the solvent or shall be
15 % minimum by mass with toluene as the solvent, when tested in accordance with 6.3.
5.2 Dissolution—The cement shall be capable of dissolving an additional 10 % by mass of styrene-rubber (SR) resin or compound
meeting the requirements of 4.1.1 at 2323 °C 6 2°C (73.42 °C (73.4 °F 6 3.6°F)3.6 °F) without evidence of gelation.
5.3 Viscosity—The minimum viscosity at 2323 °C 6 2°C (73.42 °C (73.4 °F 6 3.6°F)3.6 °F) shall be 90 mPa·s (90 cP) when
tested in accordance with 6.2.
NOTE 2—Cements approaching the minimum viscosity of this specification generally are not recommended for noninterference-type fit (where gap exists
between the pipe and fitting socket).
5.4 Lap Shear Strength:
5.4.1 The minimum lap shear strength of a cement made with methyl ethyl ketone as the solvent when tested in accordance with
6.4 shall be 3.5 MPa (500 psi) after a 16-h curing time and 6.0 MPa (900 psi) after a 48-h curing time.
5.4.2 The minimum lap shear strength of a cement made with toluene as the solvent when tested in accordance with 6.4 shall be
1.6 MPa (230 psi) after a 16-h curing time and 2.4 MPa (350 psi) after a 48-h curing time.
D3122 − 21
NOTE 3—These values should not be used for designing pipe joints.
6. Test Methods
6.1 The properties enumerated in this specification shall be determined in accordance with the following methods:
6.1.1 Conditioning—Condition the test specimens at 2323 °C 6 2°C (73.42 °C (73.4 °F 6 3.6°F)3.6 °F) for not less than 40 h
prior to test in accordance with Procedure A of Practice D618, for those tests where conditioning is required.
6.1.2 Test Conditions—Conduct tests at 2323 °C 6 2°C (73.42 °C (73.4 °F 6 3.6°F),3.6 °F), unless otherwise specified in the test
methods or in this specification.
6.2 Viscosity:
6.2.1 The samples for test shall be representative of the material under consideration. One sample for every batch shall be tested
in accordance with 6.2.2 unless otherwise agreed upon by the supplier and the purchaser.
6.2.2 Measure the viscosity in accordance with Method B of Test Methods D1084, except that conditioning to temperature
equilibrium only is required. Use rotational viscometer with a full scale torque reading of 0.7 mN-m (see E1953), a speed of 10
r/min, and the spindle that, by trial, gives the closest reading to center range of scale for the cement being tested.
6.3 Total Solids:
6.3.1 Apparatus:
6.3.1.1 Ointment Tins—Style No. 12, 30 mL (1 oz) all metal.
6.3.1.2 Vacuum Oven.
6.3.1.3 Desiccator.
6.3.1.4 Analytical Balance.
6.3.2 Procedure—Stir the sample thoroughly with a spatula before weighing (Note 4). Weigh 3.0 6 0.5 g (0.106 oz. + 0.018 oz.)
of the sample to the nearest 1 mg into a tared ointment tin. Place tin into the vacuum oven (Note 5) and heat at 120°C 120 °C (248
°F) for 45 min (Note 6). Vacuum must be continually in operation to draw off flammable solvents and should be maintained at 15
mm Hg(0.60 in.) maximum. Remove the tin from the oven and cap immediately. Place in a desiccator until cooled to room
temperature. Weigh the tin and dried sample to the nearest 1 mg.
NOTE 4—This material is usually nonhomogeneous and shall be thoroughly stirred before weighing. The weighing shall also be accomplished quickly
to avoid loss of solvent by volatilization.
NOTE 5—The use of a vacuum oven is mandatory for drying the specimen because this oven has no exposed heating surface nor an open flame, thus
avoiding the danger of flashing. The oven also provides an open vacuum to exhaust solvent fumes.
NOTE 6—The specimen shall be left in the oven for 45 min and no longer. Specimens left in for 1 h or more show a definite increase in weight.
6.3.3 Calculation—Calculate the percentage total solids, TS, as follows:
TS,%5 ~~B 2 A!/~C 2 A!! 3100
where:
A = weight of ointment tin,
B = weight of tin and specimen after drying, and
C = weight of tin and specimen before drying.
D3122 − 21
6.3.4 Precision—Duplicate samples shall be tested for best results. Duplicate results obtained by the same analyst, on the same
material, on the same day, in the same laboratory are suspect if they differ by more than 0.52 % absolute. This procedure has a
standard deviation of 0.13.
6.4 Lap Shear Strength:
6.4.1 Number of Specimens—A
...