ASTM C581-15
(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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: C581 − 15 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 D883 Terminology Relating to Plastics
D2563 Practice for Classifying Visual Defects in Glass-
1.1 This practice is designed to evaluate, in an unstressed
Reinforced Plastic Laminate Parts
state, the chemical resistance of thermosetting resins used in
D2583 Test Method for Indentation Hardness of Rigid Plas-
the fabrication of reinforced thermosetting plastic (RTP) lami-
tics by Means of a Barcol Impressor
nates. This practice provides for the determination of changes
D2584 Test Method for Ignition Loss of Cured Reinforced
in the properties, described as follows, of the test specimens
Resins
and test reagent after exposure of the specimens to the reagent:
hardnessofspecimens,weightchangethickness,appearanceof
3. Terminology
specimens, appearance of immersion media, and flexural
strength and modulus. 3.1 Definitions of Terms:
3.1.1 For definitions of terms associated with plastic
1.1.1 This practice is also useful to evaluate other factors,
such as surfacing veils and the effect of resin additives, on the materials, see Terminology D883.
chemical resistance of the resin.
4. Significance and Use
1.2 The values stated in inch-pound units are to be regarded
4.1 The results obtained by this practice shall serve as a
as standard. The values given in parentheses are mathematical
guide in, but not as the sole basis for, selection of a thermo-
conversions to SI units that are provided for information only
setting resin used in an RTP structure. No attempt has been
and are not considered standard.
made to incorporate into the practice all the various factors that
NOTE 1—There is no known ISO equivalent to this standard.
will potentially affect the serviceability of an RTP structure
1.3 This standard does not purport to address all of the
when subjected to chemical environments. These factors will
safety concerns, if any, associated with its use. It is the
potentially include stress, different resin-to-glass ratios, and
responsibility of the user of this standard to establish appro-
multiple veils.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
5.1 Hardness Testing Instrument—Thisshallbeasdescribed
2. Referenced Documents
in Test Method D2583.
2
2.1 ASTM Standards:
5.2 Flexural Properties Testing Apparatus, in accordance
D790 Test Methods for Flexural Properties of Unreinforced
with Test Methods D790.
and Reinforced Plastics and Electrical Insulating Materi-
als
5.3 Thickness Measurement—A micrometer suitable for
measurement to 0.001 in. (0.025 mm).
5.4 Containers, of sufficient size, capacity, and inertness to
1
This practice is under the jurisdiction ofASTM Committee D20 on Plastics and
allow total immersion of reinforced thermosetting plastic
is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping
Systems and Chemical Equipment.
specimens in the specific corrosives chosen for testing. These
Current edition approved Dec. 1, 2015. Published January 2016. Originally
containers shall, when necessary, be capable of maintaining
ɛ1
approved in 1965. Last previous edition approved in 2008 as C581 – 03(2008) .
liquid levels of volatile solutions, that is, solvents. This can be
DOI: 10.1520/C0581-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or accomplished by the use of reflux condensers.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
5.5 Heating Apparatus—Aconstant temperature oven, heat-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. ing mantle, or liquid bath capable of maintaining temperature
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C581 − 15
within range of 64.0°F (62.2°C). Take proper precautions if of resins having different specific gravities will result in
the corrosives selected are flammable liquids. different weight percentages of glass fiber, but the volume
percentage of glass fiber will remain the same. When using
5.6 Analytical Balance, suitable for accurate weighing to
syntheti
...
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.
´1
Designation: C581 − 03 (Reapproved 2008) C581 − 15 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
ε NOTE—Note 2 was editorially revised in August 2008.
1. 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—This practice may also be used to evaluate other factors, such as surfacing veils, the effect of resin additives, and fabrication variables on
the chemical resistance of the resin.
NOTE 2—There is no known ISO equivalent to this 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 and health practices and determine the applicability of regulatory
limitations prior to use.
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 may enter intowill
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 May 1, 2008Dec. 1, 2015. Published August 2008January 2016. Originally approved in 1965. Last previous edition approved in 20032008 as
ɛ1
C581 – 03.C581 – 03(2008) . DOI: 10.1520/C0581-03R08E01.10.1520/C0581-15.
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
C581 − 15
potentially affect the serviceability of an RTP structure when subjected to chemical environments. These factors may 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 inertness to allow total immersion of reinforced thermosetting plastic specimens
in t
...
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