1、Designation:C58115An American National StandardStandard Practice forDetermining Chemical Resistance of Thermosetting ResinsUsed in Glass-Fiber-Reinforced Structures Intended forLiquid Service1This standard is issued under the fixed designation C581;the number immediately following the designation in
2、dicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the
3、 U.S.Department of Defense.1.Scope1.1 This practice is designed to evaluate,in an unstressedstate,the chemical resistance of thermosetting resins used inthe fabrication of reinforced thermosetting plastic(RTP)lami-nates.This practice provides for the determination of changesin the properties,describ
4、ed as follows,of the test specimensand test reagent after exposure of the specimens to the reagent:hardness of specimens,weight change thickness,appearance ofspecimens,appearance of immersion media,and flexuralstrength and modulus.1.1.1 This practice is also useful to evaluate other factors,such as
5、surfacing veils and the effect of resin additives,on thechemical resistance of the resin.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standa
6、rd.NOTE1There is no known ISO equivalent to this standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility
7、 of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D790 Test Methods for Flexural Properties of Unreinforcedand Reinforced Plastics and Electrical Insulating Materi-alsD883 Terminology Relating to PlasticsD2563 Practice for Classifying Visual Defects in Glass-Reinforce
8、d Plastic Laminate PartsD2583 Test Method for Indentation Hardness of Rigid Plas-tics by Means of a Barcol ImpressorD2584 Test Method for Ignition Loss of Cured ReinforcedResins3.Terminology3.1 Definitions of Terms:3.1.1 For definitions of terms associated with plasticmaterials,see Terminology D883.
9、4.Significance and Use4.1 The results obtained by this practice shall serve as aguide in,but not as the sole basis for,selection of a thermo-setting resin used in an RTP structure.No attempt has beenmade to incorporate into the practice all the various factors thatwill potentially affect the service
10、ability of an RTP structurewhen subjected to chemical environments.These factors willpotentially include stress,different resin-to-glass ratios,andmultiple veils.5.Apparatus5.1 Hardness Testing InstrumentThis shall be as describedin Test Method D2583.5.2 Flexural Properties Testing Apparatus,in acco
11、rdancewith Test Methods D790.5.3 Thickness MeasurementA micrometer suitable formeasurement to 0.001 in.(0.025 mm).5.4 Containers,of sufficient size,capacity,and inertness toallow total immersion of reinforced thermosetting plasticspecimens in the specific corrosives chosen for testing.Thesecontainer
12、s shall,when necessary,be capable of maintainingliquid levels of volatile solutions,that is,solvents.This can beaccomplished by the use of reflux condensers.5.5 Heating ApparatusA constant temperature oven,heat-ing mantle,or liquid bath capable of maintaining temperature1This practice is under the j
13、urisdiction ofASTM Committee D20 on Plastics andis the direct responsibility of Subcommittee D20.23 on Reinforced Plastic PipingSystems and Chemical Equipment.Current edition approved Dec.1,2015.Published January 2016.Originallyapproved in 1965.Last previous edition approved in 2008 as C581 03(2008)
14、1.DOI:10.1520/C0581-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbo
15、r Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 within range of 64.0F(62.2C).Take proper precautions ifthe corrosives selected are flammable liquids.5.6 Analytical Balance,suitable for accurate weighing to0.001 g.6.Reagents6.1 The test media shall consist of the reagents or soluti
16、onsto which the RTP laminates are to be exposed.7.Test Specimens7.1 Standard LaminatesPrepare standard fiber-reinforcedlaminates using identical reinforcement in all of the laminates.The laminates shall be constructed of the following materials:7.1.1 Surfacing Mat(Veil)A thin mat of fine fibers usedprimarily to produce a smooth,resin-rich surface on a rein-forced plastic.The surfacing veil helps determine the thicknessof the resin-rich layer,reduces microcracking and provides anon-wicking chemic
