1、Designation:C39008(Reapproved 2013)Standard Practice forSampling and Acceptance of Thermal Insulation Lots1This standard is issued under the fixed designation C390;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 Defense.1.Scope1.1 This practice covers criteria for establishing
3、the accept-ability of lots of shipments of preformed board,preformedblock and pipe,and batts and blanket thermal insulation basedon sampling and inspection.1.2 This practice is intended for use in conjunction withappropriate ASTM material specifications that classify anddescribe the specific physica
4、l requirements for the product interms of qualification requirements and inspection require-ments.Determination of nonconformity shall be based on thetolerances for individual sample test values prescribed in thematerial specification.1.3 This practice may require inspection substantially dif-ferent
5、 from that performed in the normal course of production.If the purchaser requires sampling and acceptance inspection inaccordance with this practice,he shall so specify in the order orcontract.1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are
6、 mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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
7、health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationE2234 Practice for Sampling a Stream of Product by Attri-butes Indexed by AQL3.Terminology3.1 DefinitionsDefinitions perta
8、ining to thermal insulat-ing materials are defined in Terminology C168.3.1.1 acceptable quality level(AQL)when a continuousseries of lots is considered,the quality level which for purposesof sampling inspection is the limit of a satisfactory processaverage.The listed AQL(AQL=10%)is the maximum perce
9、ntdefective level accepted 95%of the time by the sampling plan.3.1.2 acceptance numberthe maximum number of thenonconformities or nonconforming units in the sample that willpermit acceptance of the inspected lot or batch.3.1.3 inspectionthe process of measuring,examining,testing,gaging,or otherwise
10、comparing the unit with theapplicable requirements.3.1.4 inspection lota collection of units of product fromwhich a sample is drawn and inspected to determine confor-mance with the acceptability criteria.3.1.4.1 DiscussionAn inspection lot may differ from a lotdefined for other purposes.3.1.5 inspec
11、tion,normalinspection that is used in accor-dance with an acceptance sampling scheme when a process isconsidered to be operating at,or slightly better than,itsacceptable quality level.3.1.6 inspection,tighteneda feature of a sampling schemeusing stricter acceptance criteria than those used in normal
12、inspection.Tightened inspection is used in some samplingschemes as a protective measure to increase the probability ofrejecting lots when experience shows the level of submittedquality has deteriorated significantly.3.1.6.1 DiscussionIt is expected that the higher rate ofrejections inherent with tig
13、htened inspection will lead thesupplier to improve the quality of the submitted product.Thecriteria for determining when quality has deteriorated signifi-cantly must be defined in objective terms for any givensampling scheme.3.1.7 lot(batch)a definite quantity of some product manu-factured under con
14、ditions of production that are considereduniform.3.1.8 lot sizethe number of units in a lot or inspection lot.1This practice is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.31 on Chemical andPhysical Properties.Current edition
15、 approved Nov.1,2013.Published March 2014.Originallyapproved in 1957.Last previous edition approved 2008 as C390 081.DOI:10.1520/C0390-08R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume i
16、nformation,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.9 nonconforming unita unit of product or servicecontaining at least one nonconformity.3.1.10 nonconformitya departure of a quality characteris-tic from its intended level or state that occurs with a severitysufficient to cause the product or service not to meet aspecification requirement.3.1.11 samplea group o
