1、Designation: D 2987 88 (Reapproved 2006)Standard Test Method forMoisture Content of Asbestos Fiber1This standard is issued under the fixed designation D 2987; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the determination of the mois-ture content of asbestos fiber.1.2 WarningBreathing of asbestos dust is haz
3、ardous.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 dust that results. For informa-tion on the safe use of chrysotile asbestos, refer
4、 to “Safe Use ofChrysotile: A Manual on Preventive and Control Measures.”21.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices an
5、d deter-mine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D 2590 Test Method of Sampling Chrysotile AsbestosD 2946 Terminology for Asbestos and AsbestosCementProductsD 3879 Test Method for Sampling Amphibole Asbestos3. Summary of Test Method3.1
6、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 will give a value of moisture contentobtained under specified conditions. This value should
7、 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 maintaining 105 to 110C (220to 230F).5.2 Balance, with sensitivity of 0.01 g and capacity of atl
8、east 400 g.5.3 Weighing ContainersShallow borosilicate glassdishes or corrosion-resistant metal pans approximately 200 mm(8 in.) in diameter. Examples of suitable containers are glassculture dishes or sifting sieve pans.5.4 Desiccator.5.5 Timer, 1 h.6. Sampling and Preparation6.1 Sampling and prepar
9、ation shall be in accordance withTest Method D 2590, omitting Section 6 of that test method,for chrysotile asbestos, and with Test Method D 3879 omittingdrying step described in the first sentence of Section 6.3 of thelatter test method, for amphibole asbestos. When unsure of thetype of asbestos to
10、be tested, refer to Terminology D 2946 fordetailed descriptions of chrysotile and of the more commontypes of amphibole asbestos fibers. Samples must be containedin moistureproof containers from time of selection to time oftesting. During specimen preparation the sample should beconed and quartered w
11、ithout 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 previously taredweighing containers. Record the weight of the containe
12、rs 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 nearest 0.01 g and record as W2.NOTE 1Weigh the dried specimens without
13、 delay to minimize thegain in weight caused by the rapid absorption of atmospheric moisture due1This method is under the jurisdiction of ASTM Committee C17 on Fiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on AsbestosCement Sheet Products and Accessories.Curr
14、ent edition approved June 1, 2006. Published June 2006. Originallyapproved in 1971. Last previous edition approved in 2002 as D 2987 88 (2002)e1.2Available from The Asbestos Institute, http:/ referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servicea
15、stm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.to the hygroscopic nature of dried asbestos. Alternatively,
16、 weighing maybe carried out in an airtight weighing container.8. Calculation8.1 Calculate 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
17、 the average of three determinations as thepercent moisture content of the fiber 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, multip
18、le operator in-tralaboratory precision is within 1 % of the average in 95 % ofcases.10.2 BiasThe moisture content of asbestos fiber at equi-librium with the surrounding atmosphere is a function ofatmospheric temperature, barometric pressure and relativehumidity4. Thus, different values will be obtai
19、ned with differ-ent conditions. Generally, this variation will not be significantfor 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 mentioned
20、in this standard. Users of this standard are expressly advised that determination 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 m
21、ust be reviewed every five years andif not revised, either reapproved or withdrawn. 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 t
22、heresponsible technical committee, which you may attend. If you feel that your comments 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 C7
23、00, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or 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).4International Critical Tables, Vol 2, p. 323.D 2987 88 (2006)2
