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ASTM C581-03

(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
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 into the serviceability of an RTP structure when subjected to chemical environments. These factors may 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.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are given for information only.
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 similar or equivalent ISO 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.

General Information

Status
Historical
Publication Date
09-Jul-2003
Technical Committee
D20 - Plastics
Drafting Committee
D20.23 - Reinforced Thermosetting Resin Piping Systems and Chemical Equipment
Current Stage
Ref Project

Relations

Replaces
ASTM C581-00 - Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
Effective Date
10-Jul-2003
Replaced By
ASTM C581-03(2008)e1 - Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
Effective Date
01-May-2008
Referred By
ASTM D4762-18 - Standard Guide for Testing Polymer Matrix Composite Materials
Effective Date
10-Jul-2003
Referred By
ASTM D6041-23 - Standard Specification for Contact-Molded “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Corrosion Resistant Pipe and Fittings
Effective Date
10-Jul-2003
Referred By
ASTM D3753-20 - Standard Specification for Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Manholes and Wetwells
Effective Date
10-Jul-2003
Referred By
ASTM D5364-14(2019) - Standard Guide for Design, Fabrication, and Erection of Fiberglass Reinforced (FRP) Plastic Chimney Liners with Coal-Fired Units
Effective Date
10-Jul-2003
Referred By
ASTM D3982-21 - Standard Specification for Contact Molded “Fiberglass” (Glass Fiber Reinforced Thermosetting Resin) Ducts
Effective Date
10-Jul-2003
Referred By
ASTM D4097-19 - Standard Specification for Contact-Molded Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks
Effective Date
10-Jul-2003
Referred By
ASTM C582-23 - Standard Specification for Contact-Molded Reinforced Thermosetting Plastic (RTP) Laminates for Corrosion-Resistant Equipment
Effective Date
10-Jul-2003
Referred By
ASTM D3754-19 - Standard Specification for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer and Industrial Pressure Pipe
Effective Date
10-Jul-2003
Referred By
ASTM D3299-18 - Standard Specification for Filament-Wound Glass-Fiber-Reinforced Thermoset Resin Corrosion-Resistant Tanks
Effective Date
10-Jul-2003

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ASTM C581-03 - Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid ServiceASTM C581-03 - Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
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ASTM C581-03 - Standard Practice for Determining Chemical Resistance of Thermosetting Resins Used in Glass-Fiber-Reinforced Structures Intended for Liquid Service
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:C 581–03
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 C 581; 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 (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
3
1. Scope Reinforced Plastic Laminate Parts
D 2583 Test Method for Indentation Hardness of Rigid
1.1 This practice is designed to evaluate, in an unstressed
3
Plastics by Means of a Barcol Impressor
state, the chemical resistance of thermosetting resins used in
D 2584 Test Method for Ignition Loss of Cured Reinforced
the fabrication of reinforced thermosetting plastic (RTP) lami-
3
Resins
nates. This practice provides for the determination of changes
in the properties, described as follows, of the test specimens
3. Significance and Use
and test reagent after exposure of the specimens to the reagent:
3.1 The results obtained by this practice shall serve as a
hardnessofspecimens,weightchangethickness,appearanceof
guide in, but not as the sole basis for, selection of a thermo-
specimens, appearance of immersion media, and flexural
setting resin used in an RTP structure. No attempt has been
strength and modulus.
made to incorporate into the practice all the various factors that
1.2 The values stated in inch-pound units are to be regarded
may enter into the serviceability of an RTP structure when
as the standard. The values in parentheses are given for
subjectedtochemicalenvironments.Thesefactorsmayinclude
information only.
stress, different resin-to-glass ratios, and multiple veils.
NOTE 1—This practice may also be used to evaluate other factors, such
assurfacingveils,theeffectofresinadditives,andfabricationvariableson
4. Apparatus
the chemical resistance of the resin.
4.1 Hardness Testing Instrument—This shall be as de-
NOTE 2—There is no similar or equivalent ISO standard.
scribed in Test Method D 2583.
1.3 This standard does not purport to address all of the
4.2 Flexural Properties Testing Apparatus, in accordance
safety concerns, if any, associated with its use. It is the
with Test Methods D 790.
responsibility of the user of this standard to establish appro-
4.3 Thickness Measurement—A micrometer suitable for
priate safety and health practices and determine the applica-
measurement to 0.001 in. (0.025 mm).
bility of regulatory limitations prior to use.
4.4 Containers, of sufficient size, capacity, and inertness to
allow total immersion of reinforced thermosetting plastic
2. Referenced Documents
specimens in the specific corrosives chosen for testing. These
2.1 ASTM Standards:
containers shall, when necessary, be capable of maintaining
D 790 TestMethodsforFlexuralPropertiesofUnreinforced
liquid levels of volatile solutions, that is, solvents. This can be
and Reinforced Plastics and Electrical Insulating Materi-
accomplished by the use of reflux condensers.
2
als
4.5 HeatingApparatus—Aconstanttemperatureoven,heat-
D 2563 Practice for Classifying Visual Defects in Glass-
ing mantle, or liquid bath capable of maintaining temperature
within range of 64.0°F (62.2°C). Proper precautions should
be taken if the corrosives selected are flammable liquids.
1
ThispracticeisunderthejurisdictionofASTMCommitteeD20onPlasticsand
4.6 Analytical Balance, suitable for accurate weighing to
is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping
Systems and Chemical Equipment. 0.001 g.
Current edition approved July 10, 2003. Published August 2003. Originally
approved in 1965. Last previous edition approved in 2000 as C 581 – 00.
2
3
Annual Book of ASTM Standards, Vol 08.01.
Annual Book of ASTM Standards, Vol 08.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C581–03
5. Reagents significantly lower hardness values. The hardness value will
vary with the type of resin and number of plies of synthetic
5.1 The test media shall consist of the reagents or solutions
veil. The resin manufacturer should be contacted for the
to which the RTP laminates are to be exposed.
allowable Barcol hardness value of a laminate containing
synthetic veils with the specific resin.
6. Test Specimens
6.2.5 Laminate Condition—The laminate shall meetAccep-
6.1 Standard Laminates—Prepare standard fiber-reinforced
tance Level I of Table I of Practice D 2563.
laminates using identical reinforcement in all of the laminates
...

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7.4  
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7.5  
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Note 1: Specific test methods are applicable only to certain types of joint fillers, as stated herein.  
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