1、Designation:D258109Standard Classification System forPolybutylene(PB)Plastics Molding and Extrusion Materials1This standard is issued under the fixed designation D2581;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This classification system covers polybutylene plasticsmaterials suitable for molding and extrusion.1.2 This classification sys
3、tem is applicable to all butenehomopolymers and to copolymers of butene with a maximumcontent of other 1-olefinic monomers of less than 50%andwith a content of non-olefinic monomers with functionalgroups up to a maximum of 1%.1.3 This classification system allows for the use of thosepolybutylene pla
4、stic materials that are to be recycled,reconstituted,and reground,provided the following conditionsare met:1.3.1 The requirements as stated in this classification systemand other guideline pertaining to these materials are met,and1.3.2 The material has not been modified in any way to alterits confor
5、mance to water contact regulations or other similarrequirements.1.4 The proportions of recycled,reconstituted,and regrindmaterial used,as well as the nature and the amount of anycontaminant,cannot be practically covered in this classificationsystem.It is the responsibility of the supplier and buyer
6、ofrecycled,reconstituted,and regrind materials to ensure com-pliance.1.5 The properties included in this classification system arethose required to characterize and classify the specific product.Other properties are necessary to identify particular character-istics important to specialized applicati
7、ons.These are specifiedby using suffixes as given in Section 5.Properties shall beselected in such a manner that consistency of different lots orshipments is assured.The tests involved in this classificationsystem are intended to provide information for identifyingmaterials in accordance with types
8、and categories.It is not thefunction of this classification system to provide specific engi-neering data for design purposes.1.6 This classification system and subsequent line callout(specification)are intended to provide a means of calling outplastic materials used in the fabrication of end items o
9、r parts.It is not intended for the selection of materials.Materialselection is to be made by those having expertise in the plasticfield after careful consideration of the design and the perfor-mance required of the part,the environment to which it will beexposed,the fabrication process to be employe
10、d,the costsinvolved,and the inherent properties of the material other thanthose covered by this standard.1.7 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.NOTE1This standard,ISO 8986-1,and ISO 8986-2 address the samesubject ma
11、tter,but differ in technical content.1.8 The following precautionary caveat pertains only to thetest methods portion,Section 11,of this classification system:This standard does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this
12、 standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C177 Test Method for Steady-State Heat Flux Measure-ments and Thermal Transmission Properties by Means ofthe Guarded-Hot-Plate
13、 ApparatusD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity(Dielectric Constant)of Solid Electrical InsulationD257 Test Methods for DC Resista
14、nce or Conductance ofInsulating MaterialsD495 Test Method for High-Voltage,Low-Current,Dry ArcResistance of Solid Electrical InsulationD543 Practices for Evaluating the Resistance of Plastics toChemical ReagentsD570 Test Method for Water Absorption of Plastics1This classification system is under the
15、 jurisdiction ofASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Aug.1,2009.Published August 2009.Originallyapproved in 1967.Last previous edition approved in 2002 as D2581-02.DOI:10.1520/D2581-09.2For referenced
16、 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 of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 D618 Practice for Conditioning Plastics for TestingD635 Test Method for Rate of Burning and/or Extent andT
