1、Designation:D178621Standard Specification forToluene Diisocyanate1This standard is issued under the fixed designation D1786;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates t
2、he year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers toluene diisocyanate used asan ingredient in the production of polyurethane materials.NOTE1The properties included in this specification are thos
3、e requiredto characterize toluene diisocyanate.Other requirements are possible andwill be added as the necessary test methods become available.1.2 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 t
4、o establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.NOTE2There is no known ISO equivalent to this standard.1.3 This international standard was developed in accor-dance with internationally recognized principles on
5、 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)Committee.2.Referenced Documents2.1 ASTM Standards:2D883 Terminology Relating to PlasticsD4660 T
6、est Methods for Polyurethane Raw Materials:De-termination of the Isomer Content of ToluenediisocyanateD4661 Test Methods for Polyurethane Raw Materials:De-termination of Total Chlorine in IsocyanatesD4663 Test Method for Polyurethane Raw Materials:Deter-mination of Hydrolyzable Chlorine of Isocyanat
7、esD4877 Test Method for Polyurethane Raw Materials:Deter-mination of APHA Color in IsocyanatesD5155 Test Methods for Polyurethane Raw Materials:De-termination of the Isocyanate Content ofAromatic Isocya-natesD5629 Test Method for Polyurethane Raw Materials:Deter-mination of Acidity in Low-Acidity Ar
8、omatic Isocyanatesand Polyurethane Prepolymers2.2 Federal Standard:49 CFR Transportation Part 172.0133.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,see Terminology D883.4.Classification4.1 This specification covers three classes of toluenediisocyanates,based on isomer
9、 ratio as described in Table 1.4.2 Each class is subdivided into three types on the basis ofacidity and hydrolyzable chloride differences as follows:4.2.1 Type I or AAcidity shall be less than 0.005 ex-pressed as percent HCl.Hydrolyzable chloride shall be lessthan 0.01%.4.2.2 Type II or BAcidity sha
10、ll be between 0.0070 and0.012 expressed as percent HCl.Hydrolyzable chloride shall beless than 0.015%.4.2.3 Type III or CAcidity shall be greater than 0.012expressed as percent HCl.Hydrolyzable chloride limits are setat the convenience of the supplier and purchaser.4.2.4 Toluene diisocyanate that ha
11、s an acidity value thatfalls between Type I(Type A)and Type II(Type B)is notcurrently included in this specification.5.Requirements5.1 These materials shall conform to the requirementsprescribed in Table 1.6.Sampling and Test Methods6.1 The materials shall be sampled and tested in accordancewith Tes
12、t Methods D4660,D4661,D4663,D4877,D5155,andD5629.7.Retest and Rejection7.1 If any failure occurs,it is acceptable to retest thematerial to establish conformity to the specification approvedby the purchaser and the supplier.1This specification is under the jurisdiction of ASTM Committee D20 onPlastic
13、s and is the direct responsibility of Subcommittee D20.22 on CellularMaterials-Plastics and Elastomers.Current edition approved July 1,2021.Published July 2021.Originally approvedin 1960.Last previous edition approved in 2016 as D1786-16.DOI:10.1520/D1786-21.2For referenced ASTM standards,visit the
14、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.3Code of Federal Regulation is available from U.S.Government Printing OfficeSuperintendent of Documents,732
15、 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationall
16、y recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.18.Packaging and Package Marking8.1 PackagingThe material shall be packaged in standardcommercial containers so constructed as to ensure compliancewith Department of Transportation standards for such contain-ers and shall be suitable for safe transportation at
