1、Designation: D2987/D2987M 88 (Reapproved 2011)1Standard Test Method forMoisture Content of Asbestos Fiber1This standard is issued under the fixed designation D2987/D2987M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of
2、 last revision. A number in parentheses indicates the year of lastreapproval. A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEUnits information was editorially corrected in February 2012.1. Scope1.1 This test method covers the determination of the mo
3、is-ture content of asbestos fiber.1.2 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions, when working with asbestos-cement products, minimize the dus
4、t that results. For informa-tion on the safe use of chrysotile asbestos, refer to “Safe Use ofChrysotile: A Manual on Preventive and Control Measures.”21.3 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be ex
5、act equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of wh
6、oever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D2590 Test Method for Sampling Chrysotile AsbestosD2946 Terminology for Asbestos and AsbestosCem
7、entProductsD3879 Test Method for Sampling Amphibole Asbestos43. Summary of Test Method3.1 A weighed specimen of fiber is dried in an oven, cooledin a desiccator, and reweighed. The weight loss is used todetermine the percent moisture content of the fiber.4. Significance and Use4.1 This test method w
8、ill give a value of moisture contentobtained under specified conditions. This value should not beconsidered as an absolute moisture content. Results may notcompare with those obtained by the same method underdifferent conditions, or by different methods.5. Apparatus5.1 Drying Oven, capable of mainta
9、ining 105 to 110C 220to 230F.5.2 Balance, with sensitivity of 0.01 g and capacity of atleast 400 g.5.3 Weighing ContainersShallow borosilicate glassdishes or corrosion-resistant metal pans approximately 200 mm8 in. in diameter. Examples of suitable containers are glassculture dishes or sifting sieve
10、 pans.5.4 Desiccator.5.5 Timer, 1 h.6. Sampling and Preparation6.1 Sampling and preparation shall be in accordance withTest Method D2590, omitting Section 6 of that test method, forchrysotile asbestos, and with Test Method D3879 omittingdrying step described in the first sentence of Section 6.3 of t
11、helatter test method, for amphibole asbestos. When unsure of thetype of asbestos to be tested, refer to Terminology D2946 fordetailed descriptions of chrysotile and of the more commontypes of amphibole asbestos fibers. Samples must be containedin moistureproof containers from time of selection to ti
12、me of1This test method is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on Asbestos - Cement Sheet Products and Accessories.Current edition approved Nov. 1, 2011. Published February 2012. Originallyapproved in 1
13、971. Last previous edition approved in 2006 as D2987 88 (2006).DOI: 10.1520/D2987_D2987M-88R11E01.2Available from The Asbestos Institute, http:/ referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volum
14、e information, refer to the standards Document Summary page onthe ASTM website.4Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.testing. Du
15、ring specimen preparation the sample should beconed and quartered without delay to avoid changing therepresentative moisture of the sample at the sampling location.(WarningSee 1.2.)7. Procedure7.1 Weigh out three 50-g test specimens to the nearest 0.01g simultaneously and spread them evenly into pre
16、viously taredweighing containers. Record the weight of the containers plusweight of fiber as W1.7.2 Dry the specimens in an oven at 105 to 110C 220 to230F for 1 h.7.3 Remove the dried specimen from the oven and cool toroom temperature in a desiccator. Weigh the container anddried fiber to the neares
17、t 0.01 g and record as W2.NOTE 1Weigh the dried specimens without delay to minimize thegain in weight caused by the rapid absorption of atmospheric moisture dueto the hygroscopic nature of dried asbestos. Alternatively, weighing maybe carried out in an airtight weighing container.8. Calculation8.1 C
18、alculate the percentage moisture as follows:Moisture, percent 5 W12 W2!/50.00 3 100where:W1= weight of tared container plus 50.00 g of fiberspecimen, andW2= weight of tared container plus dried fiber.9. Report9.1 Report the average of three determinations as thepercent moisture content of the fiber
19、sample tested.NOTE 2The atmospheric humidity and temperature at the samplinglocation may be reported to define the conditions for the test result moreclearly.10. Precision and Bias10.1 PrecisionThe single-sample, multiple operator in-tralaboratory precision is within 1 % of the average in 95 % ofcas
20、es.10.2 BiasThe moisture content of asbestos fiber at equi-librium with the surrounding atmosphere is a function ofatmospheric temperature, barometric pressure and relativehumidity5. Thus, different values will be obtained with differ-ent conditions. Generally, this variation will not be significant
21、for normal atmospheric changes.11. Keywords11.1 asbestos; fiber; moisture; moisture contentASTM 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
22、 of the validity of any such patent rights, and the riskof infringement of 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 withdraw
23、n. Your comments are invited either for revision of this standard or for additional 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 co
24、mments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single o
25、r multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).5International Critical Tables, Vol 2, p. 323.D2987/D2987M 88 (2011)12
