1、Designation:E 1437 98Standard Practice forHandling Silicon Carbide Whiskers1This standard is issued under the fixed designation E 1437;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
2、indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers recommended procedures to reducehealth and safety problems which may arise during handling ofrespirable silicon carbide whiskers.Respirable
3、 silicon carbidewhiskers are a crystalline silicon carbide(SiC)fiber,approxi-mately cylindrical in shape with a diameter less than 3.0 mand an aspect ratio equal to or greater than 5:1.1.2 Fragments of longer silicon carbide fibers that meet thesize definition of respirable silicon carbide whiskers
4、arecovered by this practice.1.3 Mixtures of respirable and non-respirable whiskers orfibers,or both,are covered by this practice.1.4 The information contained in this practice may beconsidered for use in a material safety data sheet(MSDS)forsilicon carbide whiskers.1.5 Other materials may be present
5、 in the final product(forexample,crystalline silica);information specific to these addi-tional materials should be included in each manufacturersMSDS.1.6 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 sta
6、ndard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specific hazardand precaution statements,see Sections 5,7,9,and 10.2.Referenced Documents2.1 ASTM Standards:D 6056 Test Method for Determining the Concentration ofA
7、irborne Single-Crystal Ceramic Whiskers in the Work-place Environment by Transmission Electron Microscopy2D 6057 Test Method for Determining the Concentration ofAirborne Single-Crystal Ceramic Whiskers in the Work-place Environment by Phase Contrast Microscopy2D 6058 Test Method for Determining the
8、Concentration ofAirborne Single-Crystal Ceramic Whiskers in the Work-place Environment2D 6059 Test Method for Determining the Concentration ofAirborne Single-Crystal Ceramic Whiskers in the Work-place Environment by Scanning Electron Microscopy2E 1435 Practice for Handling Densified Articles of Alum
9、i-num Oxide Reinforced with Silicon Carbide Whiskers2E 1451 Guide for Disposal of Wastes Containing RespirableSilicon Carbide Whiskers2E 1516 Guide for Packaging of Unbound Respirable SiliconCarbide Whiskers2E 1576 Guide for Medical Surveillance Program for Work-ers with Occupational Exposure to Air
10、borne Silicon Car-bide Whiskers and Fibers2E 1716 Guide for Selection and Use of Personal ProtectiveEquipment for Humans Working with Respirable SiliconCarbide Whiskers2E 1717 Guide for Personnel Training for Health and SafetyAspects of Working in Environments Containing Respi-rable Silicon Carbide
11、Whiskers2E 1718 Guide for Administrative and Engineering Controlsfor Silicon Carbide Whisker Work Areas22.2American National Standards Institute(ANSI)Stan-dards:3ANSI Z88.21992,Respiratory ProtectionANSI Z9.21979,Fundamentals Governing the Designand Operation of Local Exhaust Systems2.3Occupational
12、Safety and Health Administration(OSHA)Standard:4U.S.Code of Federal Regulations(CFR)29 CFR 1910.134,Respiratory Protection3.Terminology3.1 Definitions:3.1.1 aspect ratio,nratio of whisker length to whiskerdiameter.3.1.2 HEPA,ndisposable extended media dry-type,high-efficiency,particulate air filter
13、with a particulate removal of noless than 99.97%for 0.3 m diameter particles.51This practice is under the jurisdiction of ASTM Committee E34 on Occupa-tional Health and Safety and is the direct responsibility of Subcommittee E34.70 onSingle Crystal Ceramic Whiskers.Current edition approved April 10,
14、1998.Published June 1998.Originallypublished as E 1437 91.Last previous edition E 1437 91.2Annual Book of ASTM Standards,Vol 11.03.3Available from American National Standards Institute,11 W.42nd St.,13thFloor,New York,NY 10038.4Available from Superintendent of Documents,U.S.Government PrintingOffice
15、,Washington,DC 20402.5Fundamentals of Industrial Hygiene,4th ed.,National Safety Council,1121Spring Lake Dr.,Itasca,IL 60143-3201.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.3.1.3 respirable silicon carbide whiskers,na crystallinesili
16、con carbide fiber,approximately cylindrical in shape,with adiameter less than 3.0 m and an aspect ratio equal to or greaterthan 5:1.4.Significance and Use4.1 Workers may be exposed to respirable SiC whiskersduring handling,processing,or use of SiC whiskers or pow-dered blends containing SiC whiskers.Exposure may alsooccur during(re)finishing of consolidated or densified articleswhen respirable SiC whiskers are released.4.2 This practice provides guidance for handling,process-ing,or use of SiC wh
