ASTM D6388-18

Standard Practice for Tests to Evaluate the Chemical Resistance of Geonets to Liquids

SIGNIFICANCE AND USE
5.1 This practice is intended to provide a list of standard procedures for test programs for investigating the chemical resistance of a geonet with a liquid waste, leachate, or chemical. This practice should be used in the absence of other specifications required for the particular situation being addressed.  
5.2 Chemical resistance, as used in this practice, is not a quantifiable term. This practice is intended to provide a basis of standardization for those wishing to compare or investigate the chemical resistance of a geonet. It should be recognized that chemical resistance is a user judgment evaluation and that this practice does not offer procedures for interpreting the results obtained from test procedures contained herein. As a practice, a test result is not produced.  
5.3 This practice is for the chemical resistance assessment of geonets and is written in parallel to similar practices for geomembranes, geogrids, geotextiles, and geopipes. Each practice is to be considered individually for the geosynthetic under investigation and collectively for all geosynthetics exposed to the potentially harsh chemical environment under consideration.
SCOPE
1.1 This practice describes procedures for testing geonet products for chemical resistance with liquid wastes, prepared chemical solutions, or leachates, or both, derived from solid wastes.  
1.2 This practice describes test methods for measuring changes in mass, dimensions, tensile and hydraulic properties, and other optional physical and mechanical properties caused by immersion in test solutions, which may be representative of anticipated end-use conditions. This practice may be used to assess the extent to which a product's as-manufactured properties are affected by such immersion.  
1.3 This practice is intended to be used in conjunction with Practice D5322 or D5496. The scope of this practice is limited to testing and reporting procedures for unexposed and exposed geonet samples.  
1.4 Evaluation or interpretation of test data is beyond the scope of this practice.  
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. See Section 7 for specific hazards statements.  
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: 14-Mar-2018
• ICS: 13.030.40 - Installations and equipment for waste disposal and treatment
• Technical Committee: D35 - Geosynthetics
• Drafting Committee: D35.02 - Endurance Properties

Relations

• Replaces: ASTM D6388-99(2012) - Standard Practice for Tests to Evaluate the Chemical Resistance of Geonets to Liquids
• Effective Date: 15-Mar-2018
• Refers: ASTM D4439-24 - Standard Terminology for Geosynthetics
• Effective Date: 01-Feb-2024
• Refers: ASTM D1238-23a - Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
• Effective Date: 15-Nov-2023
• Refers: ASTM D5322-23 - Standard Practice for Laboratory Immersion Procedures for Evaluating the Chemical Resistance of Geosynthetics to Liquids
• Effective Date: 01-Sep-2023
• Refers: ASTM D5397-20 - Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test
• Effective Date: 01-Jun-2020
• Refers: ASTM D5397-19a - Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test
• Effective Date: 15-Oct-2019
• Refers: ASTM D5035-11(2019) - Standard Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
• Effective Date: 01-Jul-2019
• Refers: ASTM D5199-12(2019) - Standard Test Method for Measuring the Nominal Thickness of Geosynthetics
• Effective Date: 15-Jun-2019
• Refers: ASTM D5397-19 - Standard Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile Load Test
• Effective Date: 01-Jan-2019
• Refers: ASTM D4439-18 - Standard Terminology for Geosynthetics
• Effective Date: 15-Apr-2018
• Refers: ASTM D4439-17 - Standard Terminology for Geosynthetics
• Effective Date: 01-Aug-2017
• Refers: ASTM D5322-17 - Standard Practice for Laboratory Immersion Procedures for Evaluating the Chemical Resistance of Geosynthetics to Liquids
• Effective Date: 01-Jun-2017
• Refers: ASTM D123-17 - Standard Terminology Relating to Textiles
• Effective Date: 01-Mar-2017
• Refers: ASTM D123-15b - Standard Terminology Relating to Textiles
• Effective Date: 15-Sep-2015
• Refers: ASTM D4439-15a - Standard Terminology for Geosynthetics
• Effective Date: 01-Sep-2015

Overview

ASTM D6388-18: Standard Practice for Tests to Evaluate the Chemical Resistance of Geonets to Liquids provides a standardized approach for assessing how geonets withstand exposure to various liquid wastes, leachates, and chemicals. Developed by ASTM International, this practice supports users in designing appropriate test programs for evaluating geonet chemical resistance, especially in the context of landfill liners, environmental protection, and waste containment systems.

This standard is particularly valuable when other specifications are not available and aims to offer a basis for comparing the chemical resistance of different geonet products under immersion in potentially aggressive liquids. While the standard outlines the test procedures and required reporting, it does not interpret the results - leaving such evaluations to technical experts.

Key Topics

• Chemical Resistance Evaluation: The standard explains procedures for testing geonets’ ability to maintain their physical and chemical properties after exposure to liquid wastes, chemical solutions, or leachates. Chemical resistance is defined as a material’s capacity to retain original properties after immersion.

• Test Procedures: ASTM D6388-18 covers detailed sampling, conditioning, immersion, and property measurement steps for geonet specimens. Tests are performed on both unexposed (baseline) and exposed samples.

• Measured Properties: Required tests include:

  • Changes in weight, length, width, and thickness
  • Visual observations for color change, swelling, or deformation
  • Tensile properties (strength and elongation)
  • Hydraulic transmissivity
  • Compressive load/deflection
  • Volatiles and extractables content
  • Specific gravity

• Recommended Tests: Additional tests can include wide-width tensile properties, melt index, and oxidative induction time, facilitating a more comprehensive assessment.

• Safety Considerations: Emphasizes adherence to safety, health, and environmental protocols when handling potentially hazardous chemicals, wastes, and immersion solutions.

• Reporting: Requires detailed documentation of sampling methods, procedures, raw data, deviations from protocol, and percent changes pre- and post-immersion.

Applications

ASTM D6388-18 finds practical use in several sectors:

• Waste Containment and Environmental Protection: Used to assess geonets destined for landfill liners, leachate collection systems, and containment facilities exposed to corrosive liquids.
• Product Comparison: Provides a basis for comparing different geonet products' resistance under standardized conditions, aiding in material selection for engineering projects.
• Quality Control and Regulatory Compliance: Supports manufacturers, designers, and owners in verifying compliance with site-specific or regulatory requirements.
• Research and Development: Useful for product development and benchmarking new materials against industry standards.
• Parallel Use with Other Geosynthetic Standards: Should be used alongside standards like ASTM D5322 or D5496, ensuring comprehensive evaluation across geosynthetics such as geomembranes, geogrids, geotextiles, and geopipes.

Related Standards

For complete chemical resistance testing and analysis, use ASTM D6388-18 in conjunction with the following standards and references:

• ASTM D5322: Laboratory Immersion Procedures for Evaluating the Chemical Resistance of Geosynthetics to Liquids
• ASTM D5496: In-Field Immersion Testing of Geosynthetics
• ASTM D4716/D4716M: Test Method for Determining Hydraulic Transmissivity of Geosynthetics
• ASTM D5035: Breaking Force and Elongation of Textile Fabrics
• EPA 9090: Compatibility Test for Wastes and Membrane Liners
• ASTM D123, D792, D1238, D1621, D3895, D4595, D5199, D5397, D5747, D5885: Various referenced test methods for geosynthetic properties

Keywords: ASTM D6388-18, geonet chemical resistance, geosynthetics, liquid waste testing, environmental containment, leachate compatibility, hydraulic transmissivity, geosynthetic standards.

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: D6388 − 18
Standard Practice for
Tests to Evaluate the Chemical Resistance of Geonets to
Liquids
This standard is issued under the fixed designation D6388; 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 2. Referenced Documents
1.1 This practice describes procedures for testing geonet 2.1 ASTM Standards:
products for chemical resistance with liquid wastes, prepared D123 Terminology Relating to Textiles
chemical solutions, or leachates, or both, derived from solid D792 Test Methods for Density and Specific Gravity (Rela-
wastes. tive Density) of Plastics by Displacement
D1238 Test Method for Melt Flow Rates of Thermoplastics
1.2 This practice describes test methods for measuring
by Extrusion Plastometer
changes in mass, dimensions, tensile and hydraulic properties,
D1621 Test Method for Compressive Properties of Rigid
and other optional physical and mechanical properties caused
Cellular Plastics
by immersion in test solutions, which may be representative of
D3895 Test Method for Oxidative-Induction Time of Poly-
anticipated end-use conditions. This practice may be used to
olefins by Differential Scanning Calorimetry
assess the extent to which a product’s as-manufactured prop-
D4439 Terminology for Geosynthetics
erties are affected by such immersion.
D4595 Test Method for Tensile Properties of Geotextiles by
1.3 This practice is intended to be used in conjunction with
the Wide-Width Strip Method
Practice D5322 or D5496. The scope of this practice is limited
D4716/D4716M Test Method for Determining the (In-plane)
to testing and reporting procedures for unexposed and exposed
Flow Rate per Unit Width and Hydraulic Transmissivity
geonet samples.
of a Geosynthetic Using a Constant Head
D5035 Test Method for Breaking Force and Elongation of
1.4 Evaluation or interpretation of test data is beyond the
scope of this practice. Textile Fabrics (Strip Method)
D5199 Test Method for Measuring the Nominal Thickness
1.5 This standard does not purport to address all of the
of Geosynthetics
safety concerns, if any, associated with its use. It is the
D5322 Practice for Laboratory Immersion Procedures for
responsibility of the user of this standard to establish appro-
Evaluating the Chemical Resistance of Geosynthetics to
priate safety, health, and environmental practices and deter-
Liquids
mine the applicability of regulatory limitations prior to use.
D5397 Test Method for Evaluation of Stress Crack Resis-
See Section 7 for specific hazards statements.
tance of Polyolefin Geomembranes Using Notched Con-
1.6 This international standard was developed in accor-
stant Tensile Load Test
dance with internationally recognized principles on standard-
D5496 Practice for In Field Immersion Testing of Geosyn-
ization established in the Decision on Principles for the
thetics
Development of International Standards, Guides and Recom-
D5747/D5747M Practice for Tests to Evaluate the Chemical
mendations issued by the World Trade Organization Technical
Resistance of Geomembranes to Liquids
Barriers to Trade (TBT) Committee.
D5885/D5885M Test Method for Oxidative Induction Time
of Polyolefin Geosynthetics by High-Pressure Differential
This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-
thetics and is the direct responsibility of Subcommittee D35.02 on Endurance
Properties. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 15, 2018. Published April 2018. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1999. Last previous edition approved in 2012 as D6388 – 99 (2012). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D6388-18. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6388 − 18
Scanning Calorimetry 5.3 This practice is for the chemical resistance assessment
2.2 EPA Standards: of geonets and is written in parallel to similar practices for
geomembranes,geogrids,geotextiles,andgeopipes.Eachprac-
EPA/600/2–88/052 Lining of Waste Containment and Other
Impoundment Facilities tice is to be considered individually for the geosynthetic under
investigation and collectively for all geosynthetics exposed to
EPA 9090 Compatibility Test for Wastes and Membrane
Liners the potentially harsh chemical environment under consider-
ation.
3. Terminology
6. Apparatus
3.1 Definitions:
3.1.1 chemical resistance, n—for geosynthetics, the extent
6.1 Analytical Balance, capable of weighing to an accuracy
to which a material or product retains its original physical and
of 0.001 g.
chemical characteristics as a function of immersion in, or
6.2 Measuring Equipment, such as scales or calipers, suit-
contact with, a foreign substance (see Practice D5747/
able for determining dimensions of geonet specimens.
D5747M).
6.3 All other required equipment is specified in the refer-
3.1.2 geonet, n—a geosynthetic consisting of integrally
enced test methods. Refer to the appropriate standards for a
connected parallel sets of ribs overlying similar sets at various
description of the apparatus necessary to perform those tests.
angles for planar drainage of liquids or gases (seeTerminology
D4439).
7. Hazards
3.1.3 geosynthetic, n—a planar product manufactured from
NOTE 1—The solutions used in this practice may contain hazardous
polymeric material used with soil, rock, earth, or other geo- chemicals.Appropriate precautions must be taken when handling hazard-
ous waste, chemicals, and the immersion solutions. Protective equipment
technical engineering related material as an integral part of a
suitable for the chemicals being used must be worn by all personnel
manmade project, structure, or system (see Terminology
handling or exposed to the chemicals. Particular care should be taken
D4439).
when opening storage vessels at elevated temperatures due to the
increased volatility of organics and the increased activity of acids and
3.1.4 specimen, n—a specific portion of a material or
bases. Care also must be taken to prevent the spilling of hazardous
laboratory sample upon which a test is performed or which is
materials, and provisions must be made to clean up any accidental spills
taken for that purpose (see Terminology D4439).
that do occur.
3.1.5 For definitions of terms used in this practice, refer to
7.1 Before carrying out any test, safety precautions and
Terminologies D123 and D4439.
disposal procedures for hazardous waste, chemicals, or immer-
sion solutions, and any contaminated geonet materials, should
4. Summary of Practice
be identified and implemented to provide full protection to all
4.1 This practice defines test methods and procedures for
personnel and to comply with applicable disposal regulations.
evaluating the resistance of geonet to liquid exposure by
monitoring physical and chemical properties of geonet speci-
8. Sampling
mens immersed in a test liquid. The physical condition of the
8.1 Determine the number and dimensions of the test
geonet is monitored as a function of cumulative exposure time
specimens according to the requirements of the dimensional
by means of dimensional measurements and physical and
measurements and physical/polymer property tests to be
chemical property tests.
performed, the duration of the immersion, and the number of
test intervals.
5. Significance and Use
NOTE 2—In contrast to other related chemical resistance test practices,
5.1 This practice is intended to provide a list of standard
this practice provides for the preparation of individual test specimens
procedures for test programs for investigating the chemical
directly from roll materials instead of prepared samples or exposure
resistance of a geonet with a liquid waste, leachate, or
coupons, or both. These test specimens then are used for subsequent
chemical. This practice should be used in the absence of other
exposure and testing.
specifications required for the particular situation being ad-
8.2 Sample in accordance with respective test methods
dressed.
selected.
5.2 Chemical resistance, as used in this practice, is not a
8.3 Cut individual test specimens in both the machine and
quantifiableterm.Thispracticeisintendedtoprovideabasisof
transverse directions from stock roll material.
standardization for those wishing to compare or investigate the
8.4 Mix or shuffle in a random fashion, and then select
chemical resistance of a geonet. It should be recognized that
pre-cut, randomly mixed specimens for assignment to unex-
chemical resistance is a user judgment evaluation and that this
posed (baseline) testing or immersion in test solutions for
practice does not offer procedures for interpreting the results
testing after exposure.
obtained from test procedures contained herein. As a practice,
a test result is not produced.
8.5 Cut individual test specimens for dimension and mass
measurements. Specimens may be of any size for which
accurate and repeatable measurements can be made, compat-
Available from the National Technical Information Service, PB–89–129670.
ible with the immersion tank. Cut specimens from sheet stock
Available from the Superintendent of Documents, U.S. Government Printing
Office, Washington, DC 20402. using a die to ensure consistency of dimensions.
D6388 − 18
NOTE 3—Square specimens 152.4 by 152.4 mm (6 by 6 in.) have been
measurement of weight before and after immersion. Measure
found to be satisfactory for dimensional and mass measurements. The
length and width (in both machine and transverse directions) at
same individual specim
...

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: D6388 − 99 (Reapproved 2012) D6388 − 18
Standard Practice for
Tests to Evaluate the Chemical Resistance of Geonets to
Liquids
This standard is issued under the fixed designation D6388; 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 practice describes procedures for testing geonet products for chemical resistance with liquid wastes, prepared chemical
solutions, or leachates, or both, derived from solid wastes.
1.2 This practice describes test methods for measuring changes in mass, dimensions, tensile and hydraulic properties, and other
optional physical and mechanical properties caused by immersion in test solutions, which may be representative of anticipated end
use end-use conditions. This practice may be used to assess the extent to which a product’s as-manufactured properties are affected
by such immersion.
1.3 This practice is intended to be used in conjunction with PracticesPractice D5322 or D5496. The scope of this practice is
limited to testing and reporting procedures for unexposed and exposed geonet samples.
1.4 Evaluation or interpretation of test data is beyond the scope of this practice.
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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use. See Section 7 for specific hazards statements.
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.
2. Referenced Documents
2.1 ASTM Standards:
D123 Terminology Relating to Textiles
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D1238 Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer
D1621 Test Method for Compressive Properties of Rigid Cellular Plastics
D3895 Test Method for Oxidative-Induction Time of Polyolefins by Differential Scanning Calorimetry
D4439 Terminology for Geosynthetics
D4595 Test Method for Tensile Properties of Geotextiles by the Wide-Width Strip Method
D4716D4716/D4716M Test Method for Determining the (In-plane) Flow Rate per Unit Width and Hydraulic Transmissivity of
a Geosynthetic Using a Constant Head
D5035 Test Method for Breaking Force and Elongation of Textile Fabrics (Strip Method)
D5199 Test Method for Measuring the Nominal Thickness of Geosynthetics
D5322 Practice for Laboratory Immersion Procedures for Evaluating the Chemical Resistance of Geosynthetics to Liquids
D5397 Test Method for Evaluation of Stress Crack Resistance of Polyolefin Geomembranes Using Notched Constant Tensile
Load Test
D5496 Practice for In Field Immersion Testing of Geosynthetics
D5747D5747/D5747M Practice for Tests to Evaluate the Chemical Resistance of Geomembranes to Liquids
This practice is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.02 on Endurance Properties.
Current edition approved July 1, 2012March 15, 2018. Published July 2012. April 2018. Originally approved in 1999. Last previous edition approved in 20052012 as
D6388–99(2005).D6388 – 99 (2012). DOI: 10.1520/D6388-99R12.10.1520/D6388-18.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D6388 − 18
D5885/D5885M Test Method for Oxidative Induction Time of Polyolefin Geosynthetics by High-Pressure Differential Scanning
Calorimetry
2.2 EPA Standards:
EPA/600/2–88/052 Lining of Waste Containment and Other Impoundment Facilities
EPA 9090 Compatibility Test for Wastes and Membrane Liners
3. Terminology
3.1 Definitions:
3.1.1 chemical resistance, n—for geosynthetics, the extent to which a material or product retains its original physical and
chemical characteristics as a function of immersion in, or contact with, a foreign substance (see Practice D5747D5747/D5747M).
3.1.2 geonet, n—a geosynthetic consisting of integrally connected parallel sets of ribs overlying similar sets at various angles
for planar drainage of liquids or gases (see Terminology D4439).
3.1.3 geosynthetic, n—a planar product manufactured from polymeric material used with soil, rock, earth, or other geotechnical
engineering related material as an integral part of a manmade project, structure, or system (see Terminology D4439).
3.1.4 specimen, n—a specific portion of a material or laboratory sample upon which a test is performed or which is taken for
that purpose (see Terminology D4439).
3.1.5 For definitions of terms used in this practice, refer to Terminologies D123 and D4439.
4. Summary of Practice
4.1 This practice defines test methods and procedures for evaluating the resistance of geonet to liquid exposure by monitoring
physical and chemical properties of geonet specimens immersed in a test liquid. The physical condition of the geonet is monitored
as a function of cumulative exposure time by means of dimensional measurements and physical and chemical property tests.
5. Significance and Use
5.1 This practice is intended to provide a list of standard procedures for test programs for investigating the chemical resistance
of a geonet with a liquid waste, leachate, or chemical. This practice should be used in the absence of other specifications required
for the particular situation being addressed.
5.2 Chemical resistance, as used in this practice, is not a quantifiable term. This practice is intended to provide a basis of
standardization for those wishing to compare or investigate the chemical resistance of a geonet. It should be recognized that
chemical resistance is a user judgment evaluation and that this practice does not offer procedures for interpreting the results
obtained from test procedures contained herein. As a practice, a test result is not produced.
5.3 This practice is for the chemical resistance assessment of geonets and is written in parallel to similar practices for
geomembranes, geogrids, geotextiles, and geopipes. Each practice is to be considered individually for the geosynthetic under
investigation and collectively for all geosynthetics exposed to the potentially harsh chemical environment under consideration.
6. Apparatus
6.1 Analytical Balance, capable of weighing to an accuracy of 0.001 g.
6.2 Measuring Equipment, such as scales or calipers, suitable for determining dimensions of geonet specimens.
6.3 All other required equipment is specified in the referenced test methods. Refer to the appropriate standards for a description
of the apparatus necessary to perform those tests.
7. Hazards
NOTE 1—Warning:The solutions used in this practice may contain hazardous chemicals. Appropriate precautions must be taken when handling
hazardous waste, chemicals, and the immersion solutions. Protective equipment suitable for the chemicals being used must be worn by all personnel
handling or exposed to the chemicals. Particular care should be taken when opening storage vessels at elevated temperatures due to the increased volatility
of organics and the increased activity of acids and bases. Care also must be taken to prevent the spilling of hazardous materials, and provisions must be
made to clean up any accidental spills that do occur.
7.1 Before carrying out any test, safety precautions and disposal procedures for hazardous waste, chemicals, or immersion
solutions, and any contaminated geonet materials, should be identified and implemented to provide full protection to all personnel
and to comply with applicable disposal regulations.
8. Sampling
8.1 Determine the number and dimensions of the test specimens according to the requirements of the dimensional measurements
and physical/polymer property tests to be performed, the duration of the immersion, and the number of test intervals.
Available from the National Technical Information Service, PB–89–129670.
Available from the Superintendent of Documents, U.S. Government Printing Office, Washington, DC 20402.
D6388 − 18
NOTE 2—In contrast to other related chemical resistance test practices, this practice provides for the preparation of individual test specimens directly
from roll materials instead of prepared samples or exposure coupons, or both. These test specimens then are used for subsequent exposure and testing.
8.2 Sample in accordance with respective test methods selected.
8.3 Cut individual test specimens in eachboth the machine and transverse directions from stock roll material.
8.4 Mix or shuffle in a random fashion, and then select pre-cut, randomly mixed specimens for assignment to unexposed
(baseline) testing or immersion in test solutions for testing after exposure.
8.5 Cut individual test specimens for dimension and mass measurements. Specimens may be of any size for which accurate and
repeatable measurements can be made, compatible with the immersion tank. Cut specimens from sheet stock using a die to
assureensure consistency of dimensions.
NOTE 3—Square specimens 152.4 by 152.4 mm (6 by 6 in.) have been found to be satisfactory for dimensional and mass measurements. The same
individual specimens may be used for length, width, thickness, and weight change measurements, if desired. Multiple dimensional measurements may
b
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