1、Designation:D178420Standard Classification System and Basis for Specification forRigid Poly(Vinyl Chloride)(PVC)Compounds andChlorinated Poly(Vinyl Chloride)(CPVC)Compounds1This standard is issued under the fixed designation D1784;the number immediately following the designation indicates the year o
2、foriginal 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 U.S.Department of
3、 Defense.1.Scope*1.1 This classification system standard covers rigid PVCand CPVC compounds intended for general purpose use inextruded or molded formincluding fittings and both pressureand nonpressure piping applicationscomposed of poly(vinylchloride),chlorinated poly(vinyl chloride),or vinyl chlor
4、idecopolymers containing at least 80%vinyl chloride,and thenecessary compounding ingredients.The compounding ingre-dients shall be permitted to consist of lubricants,stabilizers,non-poly(vinyl chloride)resin modifiers,pigments,and inor-ganic fillers.NOTE1Selection of specific compounds for particula
5、r end uses orapplications requires consideration of other characteristics such as thermalproperties,optical properties,weather resistance,etc.Specific require-ments and test methods for these properties should be by mutualagreement between the purchaser and the seller.NOTE2Selection of compounds for
6、 pressure piping applicationsrequires consideration of material stress ratings that are required fordetermining pressure ratings,but are not addressed in this specification.Requirements for long-term material stress ratings in accordance withrecognized stress rating standards,such as HDB in accordan
7、ce with TestMethod D2837 for pressure piping,should be included in specificationsfor pressure piping products or systems.NOTE3The list of compounding ingredients in 1.1 is not meant to bean exhaustive list of allowable compound ingredients.In addition to thecompounding ingredients listed,others may
8、also be used.The list ofcompounding ingredients in 1.1 does not imply that every ingredient listedis a required ingredient.Some compounds may not contain all theingredients listed in 1.1.1.2 For applications involving special chemical resistancesee Classification D5260.1.3 The requirements in this c
9、lassification system standardare intended for the quality control of compounds used tomanufacture finished products.These properties are based ondata obtained using standard test specimens tested underspecified conditions.They are not directly applicable to fin-ished products.See the applicableASTM
10、standards for require-ments for finished products.1.4 The text of this classification system standard referencesnotes and footnotes that provide explanatory material.Thesenotes and footnotes(excluding those in tables and figures)shallnot be considered as requirements of this specification.1.5 Some r
11、igid PVC applications have the option to containrecycled PVC plastics that meet the requirements of thisclassification system standard.Refer to the specific require-ments in the materials and manufacture section of the appli-cable product standard.1.6 The values stated in SI units are to be regarded
12、 asstandard.The values given in parentheses are for informationonly.1.7 The following safety hazards caveat pertains only to thetest methods portion,Section 11,of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsib
13、ility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory limitations prior to use.NOTE4This specification is similar in content(but not technicallyequivalent)to ISO 1163-1:1985 and ISO 1163-2:1980.1.8 This intern
14、ational standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Commi
15、ttee.2.Referenced Documents2.1 ASTM Standards:2D256 Test Methods for Determining the Izod PendulumImpact Resistance of PlasticsD618 Practice for Conditioning Plastics for Testing1This classification system standard is under the jurisdiction of ASTM Commit-tee D20 on Plastics and is the direct respon
16、sibility of Subcommittee D20.15 onThermoplastic Materials.Current edition approved Jan.15,2020.Published February 2020.Originallyapproved in 1960.Last previous edition approved in 2011 as D1784 11.DOI:10.1520/D1784-20.2For 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.*A Summary of Changes section appears at the end
