1、Designation: E785 81 (Reapproved 2017)Standard Specification forCrucibles, Ignition, Laboratory, Metal1This standard is issued under the fixed designation E785; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis
2、ion. 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 specification covers two types of met
3、al ignitioncrucibles, nickel or platinum, complete with covers, for labo-ratory use.2. Referenced Documents2.1 ASTM Standards:2B162 Specification for Nickel Plate, Sheet, and Strip2.2 Federal Standards:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)2.3 Military Standards:3MIL-STD-105 Sampli
4、ng Procedures and Tables for Inspec-tion by AttributesMIL-STD-129 Marking for Shipment and StorageMIL-STD-1188 Commercial Packaging of Supplies andEquipment3. Classification3.1 Types and CapacitiesThe crucibles shall be furnishedin one or more of the following types or capacities as specified(see S2
5、.1).3.1.1 Type INickel.Capacity: 100 mL250 mL3.1.2 Type IIPlatinum.Capacity: 20 mL4. Materials4.1 Type ICrucibles and covers shall be made from99.4 % nickel, spun and hardened in conformance with Speci-fication B162.4.2 Type IICrucibles and covers shall be made from99.9 % platinum plus iridium, with
6、 the iridium content of notmore than 0.4 %.5. Physical Requirements5.1 Crucibles shall have a standard shape with a flat base togive a firm and stable resting surface. The side wall shall forma sloping and convex surface extending up to the brim.Crucibles shall be of one-piece construction.5.2 Cover
7、s shall be flat, sunken in the center, and shall havean extension to serve as a handle. The sunken area in the centershall fit inside the crucible.6. Dimensions, Mass, and Permissible Variations6.1 Type I crucibles and covers shall conform to the require-ments of Table 1.6.2 Type II Crucibles and Co
8、vers:6.2.1 Type II crucibles shall conform to the requirements ofTable 2.6.2.2 Type II covers shall conform to the requirements ofTable 3.7. Workmanship7.1 Crucibles and covers shall be free of defects (scratches,dents, discolorations) or contamination (grease, oil, foreignmatter) that detract from
9、their appearance or that impair theirserviceability.8. Keywords8.1 crucibles; ignition; nickel; platinum1This specification is under the jurisdiction of ASTM Committee E41 onLaboratory Apparatus and is the direct responsibility of Subcommittee E41.01 onLaboratory Ware and Supplies.Current edition ap
10、proved Jan. 1, 2017. Published February 2017. Originallyapproved in 1981. Last previous edition approved in 2011 as E785 81 (2011).DOI: 10.1520/E0785-81R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AST
11、MStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.Copyright ASTM International, 100 Barr Harbor Drive
12、, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issu
13、ed by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1SUPPLEMENTARY REQUIREMENTSThe following supplementary requirements are binding when this specification is used by theDepartment of Defense and the Federal Government for the procurement of platinum evaporatingdishes.S1.
14、SamplingS1.1 Sampling for nondestructive examination shall beconducted in accordance with MIL-STD-105.S2. Ordering InformationS2.1 Procurement documents should specify the following:S2.1.1 Title, number, and date of this ASTM specification.S2.1.2 Level of packaging and packing required,S2.1.3 Type a
15、nd capacity of crucible required, andS2.1.4 Number of unit packages per intermediate packagesrequired.S2.2 Suppliers ResponsibilityThe supplier is responsiblefor the performance of all inspection requirements as specifiedherein. Except as otherwise specified, the supplier may use hisown or any other
16、 inspection facilities and services acceptableto the Government. Inspection records of the examination andtests shall be kept complete and available to the Government asspecified in the contract or order. The Government reserves theright to perform any of the inspections set forth in thespecificatio
17、n where such inspections are deemed necessary toensure that supplies and services conform to prescribed re-quirements.S2.3 Transportation DescriptionTransportation descrip-tion applicable to this item is:S2.3.1 Type INickel:S2.3.1.1 Crucibles, not otherwise indexed by name. Car-load minimum weight 2
18、4 000 lb. Subject to Rule 34, UniformFreight Classification3S2.3.1.2 Crucibles, not otherwise indexed. Motor volumeminimum weight 24 000 lb.S2.3.2 Type IIPlatinum. Not taken by freight. Ship via UPSor parcel post.S3. Lotting and SamplingS3.1 A lot shall consist of the crucibles and covers of thesame
19、 type and capacity offered for acceptance at one time,which has been produced by one manufacturer under essen-tially the same manufacturing conditions.S3.2 Sampling shall be conducted in accordance with Sec-tion S1.1S4. InspectionS4.1 Special Provisions:S4.1.1 Alternative Inspection (Including Testi
20、ng)ProceduresThe supplier may use any alternative inspectionprocedures that will ensure equal or better quality by submit-ting a written proposal with justification and obtaining writtenapproval from the Government prior to instituting the proce-dure. In case of dispute, the procedures of this speci
21、ficationwill govern.S4.2 Supplemental EvidenceThe supplier shall provideevidence acceptable to the contracting officer that the require-ments of 6.1 and 6.2 and S7, have been satisfied (see S2.1).S4.3 ExaminationSample crucibles, covers, and Level Aand commercial packaging requirements shall be exam
22、ined inaccordance with the classification of defects and with MIL-STD-105.TABLE 1 Crucible Dimensions (Type I)Capacity,mLOutsideDiameter, mmBottom ODA,mmHeight, mmWallThicknessB,mmODAExclusiveofHandle, mmLengthAincl.Handle, mmInsideBDiameter ofSunken Section, mmWallAThickness,mm100 60 30 64 0.625 67
23、 92 58 0.625250 83 50 83 0.625 92 116 83 0.625ATolerance 2 mm.BTolerance 0.25 mm.TABLE 2 Crucible Dimensions (Type II)Capacity,mLTop InsideDiameter, mmBottom InsideDiameter, mmHeight, mmThickness ofSide, mmThickness ofBottom, mmWeight, g20 32.40.8 191.0 34.52.0 0.220.05 0.250.05 161.0TABLE 3 Cover R
24、equirements (Type II)Thickness, mmOutside DiameterExcluding Handle,mmLength IncludingHandle, mmDiameter of Sun-ken Section, mmDepth of SunkenSection, mmWeight, g0.1370.01 36.40.2 470.5 31.50.5 3.00.3E785 81 (Reapproved 2017)2S4.3.1 Classification of defects, shall be in accordance withTable S4.1 and
25、 Table S4.2.S5. Rejection CriteriaS5.1 The sample must pass all physical and chemicalrequirements when tested as specified to be accepted. Any testfailure will result in the rejection of the lot.S6. CertificationS6.1 Compliance with all stipulations of this specificationregarding fill, closure, mark
26、ing and other requirements notinvolving tests will be certified by the supplier.S7. MarkingS7.1 Civil AgenciesIn addition to any special markingrequired by the contract or order, interior packages and exteriorshipping containers shall be marked in accordance with Fed.Std. No. 123.S7.2 Military Agenc
27、iesIn addition to any special markingrequired by the contract or order, interior packages and exteriorshipping containers shall be marked in accordance with MIL-STD-129.S7.3 Commercial In addition to any special markingrequired by the contract or order, marking shall be accom-plished in accordance w
28、ith MIL-STD-1188.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of
29、 such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for a
30、dditional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to
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33、p:/ S4.1 Classification of Defects of Crucibles and CoversCategories DefectsCritical: none defined.Major: AQL 4.0 % defective.101 dimensions incorrect.102 defects (scratches, dents, discoloration).103 contamination (oil, grease, or foreign matter).104 marking missing, illegible, or incorrect.TABLE S
34、4.2 Classification of Defects of Level A andCommercial PackagingCategories DefectsCritical: none defined.Major: AQL 1.5 % defective.101 unit, intermediate, or shipping container not asspecified.102 number of crucibles per unit or intermediate containernot as specified.103 closure of unit, intermediate, or shipping container notas specified.104 unit, intermediate, or shipping container closure notas specified.E785 81 (Reapproved 2017)3
