ASTM C581-20
(Practice)Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
SIGNIFICANCE AND USE
4.1 The results obtained by this practice shall serve as a guide in, but not as the sole basis for, selection of a thermosetting resin used in an RTP structure. No attempt has been made to incorporate into the practice all the various factors that will potentially affect the serviceability of an RTP structure when subjected to chemical environments. These factors will potentially include stress, different resin-to-glass ratios, and multiple veils.
SCOPE
1.1 This practice is designed to evaluate, in an unstressed state, the chemical resistance of thermosetting resins used in the fabrication of reinforced thermosetting plastic (RTP) laminates. This practice provides for the determination of changes in the properties, described as follows, of the test specimens and test reagent after exposure of the specimens to the reagent: hardness of specimens, weight change thickness, appearance of specimens, appearance of immersion media, and flexural strength and modulus.
1.1.1 This practice is also useful to evaluate other factors, such as surfacing veils and the effect of resin additives, on the chemical resistance of the resin.
1.2 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 1: There is no known ISO equivalent to this standard.
1.3 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.
1.4 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.
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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: C581 − 20
Standard Practice for
Determining Chemical Resistance of Thermosetting Resins
Used in Glass-Fiber-Reinforced Structures Intended for
1
Liquid Service
This standard is issued under the fixed designation C581; 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* 2. Referenced Documents
2
1.1 This practice is designed to evaluate, in an unstressed 2.1 ASTM Standards:
state, the chemical resistance of thermosetting resins used in D790 Test Methods for Flexural Properties of Unreinforced
the fabrication of reinforced thermosetting plastic (RTP) lami- and Reinforced Plastics and Electrical Insulating Materi-
nates. This practice provides for the determination of changes als
in the properties, described as follows, of the test specimens D883 Terminology Relating to Plastics
and test reagent after exposure of the specimens to the reagent: D2563 Practice for Classifying Visual Defects in Glass-
hardnessofspecimens,weightchangethickness,appearanceof Reinforced Plastic Laminate Parts
specimens, appearance of immersion media, and flexural D2583 Test Method for Indentation Hardness of Rigid Plas-
strength and modulus. tics by Means of a Barcol Impressor
1.1.1 This practice is also useful to evaluate other factors, D2584 Test Method for Ignition Loss of Cured Reinforced
such as surfacing veils and the effect of resin additives, on the Resins
chemical resistance of the resin.
3. Terminology
1.2 The values stated in inch-pound units are to be regarded
3.1 Definitions of Terms:
as standard. The values given in parentheses are mathematical
3.1.1 For definitions of terms associated with plastic
conversions to SI units that are provided for information only
and are not considered standard. materials, see Terminology D883.
NOTE 1—There is no known ISO equivalent to this standard.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 The results obtained by this practice shall serve as a
safety concerns, if any, associated with its use. It is the
guide in, but not as the sole basis for, selection of a thermo-
responsibility of the user of this standard to establish appro-
setting resin used in an RTP structure. No attempt has been
priate safety, health, and environmental practices and deter-
madetoincorporateintothepracticeallthevariousfactorsthat
mine the applicability of regulatory limitations prior to use.
will potentially affect the serviceability of an RTP structure
1.4 This international standard was developed in accor-
when subjected to chemical environments. These factors will
dance with internationally recognized principles on standard-
potentially include stress, different resin-to-glass ratios, and
ization established in the Decision on Principles for the
multiple veils.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Apparatus
Barriers to Trade (TBT) Committee.
5.1 HardnessTestingInstrument—Thisshallbeasdescribed
in Test Method D2583.
1
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand
is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping
2
Systems and Chemical Equipment. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Feb. 15, 2020. Published March 2020. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1965. Last previous edition approved in 2015 as C581 – 15. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0581-20. 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
1
---------------------- Page: 1 ----------------------
C581 − 20
5.2 Flexural Properties Testing Apparatus, in accordance 7.2.1 Laminate Size—A suitable laminate size has been
with Test Methods D790. found to be 26 by 33 in. (660 by 838 mm) after trimming. This
laminate size is not restrictive and other dimensions are
5.3 Thickness Measurement—A micrometer suitable for
acceptable.
measurement to 0.001 in. (0.025 mm).
7.2.2 Thickness—The thickness of the cured standard lami-
5.4 Containers, of sufficient size, capacity, and inertness to
nate shall
...
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: C581 − 15 C581 − 20 An American National Standard
Standard Practice for
Determining Chemical Resistance of Thermosetting Resins
Used in Glass-Fiber-Reinforced Structures Intended for
1
Liquid Service
This standard is issued under the fixed designation C581; 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 Scope*
1.1 This practice is designed to evaluate, in an unstressed state, the chemical resistance of thermosetting resins used in the
fabrication of reinforced thermosetting plastic (RTP) laminates. This practice provides for the determination of changes in the
properties, described as follows, of the test specimens and test reagent after exposure of the specimens to the reagent: hardness
of specimens, weight change thickness, appearance of specimens, appearance of immersion media, and flexural strength and
modulus.
1.1.1 This practice is also useful to evaluate other factors, such as surfacing veils and the effect of resin additives, on the
chemical resistance of the resin.
1.2 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 1—There is no known ISO equivalent to this standard.
1.3 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.
1.4 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
2.1 ASTM Standards:
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D883 Terminology Relating to Plastics
D2563 Practice for Classifying Visual Defects in Glass-Reinforced Plastic Laminate Parts
D2583 Test Method for Indentation Hardness of Rigid Plastics by Means of a Barcol Impressor
D2584 Test Method for Ignition Loss of Cured Reinforced Resins
3. Terminology
3.1 Definitions of Terms:
3.1.1 For definitions of terms associated with plastic materials, see Terminology D883.
4. Significance and Use
4.1 The results obtained by this practice shall serve as a guide in, but not as the sole basis for, selection of a thermosetting resin
used in an RTP structure. No attempt has been made to incorporate into the practice all the various factors that will potentially affect
1
This practice is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping Systems
and Chemical Equipment.
Current edition approved Dec. 1, 2015Feb. 15, 2020. Published January 2016March 2020. Originally approved in 1965. Last previous edition approved in 20082015 as
ɛ1
C581 – 03C581 – 15.(2008) . DOI: 10.1520/C0581-15.10.1520/C0581-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. 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
1
---------------------- Page: 1 ----------------------
C581 − 20
the serviceability of an RTP structure when subjected to chemical environments. These factors will potentially include stress,
different resin-to-glass ratios, and multiple veils.
5. Apparatus
5.1 Hardness Testing Instrument—This shall be as described in Test Method D2583.
5.2 Flexural Properties Testing Apparatus, in accordance with Test Methods D790.
5.3 Thickness Measurement—A micrometer suitable for measurement to 0.001 in. (0.025 mm).
5.4 Containers, of sufficient size, capacity, and inertn
...
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