ASTM C421-2005 Standard Test Method for Tumbling Friability of Preformed Block-Type Thermal Insulation《预制块型隔热材料翻滚时易碎性的标准试验方法》.pdf

《ASTM C421-2005 Standard Test Method for Tumbling Friability of Preformed Block-Type Thermal Insulation《预制块型隔热材料翻滚时易碎性的标准试验方法》.pdf》由会员分享，可在线阅读，更多相关《ASTM C421-2005 Standard Test Method for Tumbling Friability of Preformed Block-Type Thermal Insulation《预制块型隔热材料翻滚时易碎性的标准试验方法》.pdf（2页珍藏版）》请在麦多课文档分享上搜索。

1、Designation: C 421 05Standard Test Method forTumbling Friability of Preformed Block-Type ThermalInsulation1This standard is issued under the fixed designation C 421; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last

2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method covers determination of

3、the mass lossof preformed block-type thermal insulation as a result of acombination of abrasion and impact produced by a laboratorytumbling mechanism.1.2 The values stated in inch-pound units are to be regardedas the standard. The values in parentheses are provided forinformation only.1.3 This stand

4、ard 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 health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 AS

5、TM Standards:2C 167 Test Methods for Thickness and Density of Blanketor Batt Thermal InsulationsC 168 Terminology Relating to Thermal InsulationC 303 Test Method for Dimensions and Density of Pre-formed Block and Broad-Type Thermal Insulation3. Terminology3.1 DefinitionsDefinitions pertaining to the

6、rmal insulat-ing materials are defined in Terminology C 168.4. Significance and Use4.1 Several test methods for measuring mass loss by abra-sion and impact of preformed block-type thermal insulationhave been used to some extent in the past. It is believed that nosingle test method completely covers

7、all factors involving suchforces for different kinds of materials, but this test method isintended to provide a procedure that gives reproducible results.It is used for comparing the mass loss by tumbling before andafter a specific treatment of the insulation, as agreed upon bythe purchaser and the

8、manufacturer.5. Apparatus5.1 BoxA cubical box of oak wood, having inside dimen-sions of 712 by 734 by 734 in. (190 by 197 by 197 mm),mounted rigidly at the center of one 734 by 734 in. (197 by 197mm) end, so that the axis normal to a face of the box is that ofa rotatable horizontal shaft. One side o

9、f the box shall be hingedas a door and shall be gasketed to be dust-tight. The box shaftshall be motor driven at a constant speed of 60 6 2 r/min.5.2 CubesTwenty-four room-dry, solid oak,34 6132-in.(19 6 0.8-mm) cubes shall be placed in the box with the testspecimens. The specific gravity of the oak

10、 cubes shall beapproximately 0.65; white oak meets this requirement.NOTE 1Number each group of wood cubes 1 through 24. At the endof every 600-revolution test, remove one “used” cube (follow the numbersequence and remove the oldest cube) and replace with a correspondinglynumbered “new” cube. In this

11、 manner, cube wear is eliminated as anuncontrolled variable in the test method. When the corners of the woodcubes have been worn so that the radius of curvature is greater than116 in.(1.6 mm) or the cubes have become altered so as not to be comparablewith new cubes, they shall be discarded and new o

12、nes used. A conven-tional machinists radius gage is used for checking the edge wear.6. Test Specimens6.1 Cut the insulation with a fine-tooth saw (similar to a16-tooth band saw) into 1 6116-in. (25.4 6 1.6-mm) cubes.6.2 Test twelve cubes at a time cut from one piece ofinsulation. When flat insulatio

13、n has special surfaces due totreatment or molding, cut each cube to include such specialsurfaces as one face, except that the edges and corners of theinsulation shall not be used.6.3 Dry and condition specimens prior to test, followingapplicable specifications for the material. If the material isadv

14、ersely affected by oven temperatures, then condition speci-mens for not less than 40 h at 73.46 1.8F (23 6 1C), and 506 5 % relative humidity before testing. In the absence ofdefinitive drying specifications, dry specimens in an oven at215 to 250F (102 to 121C) to constant mass, and hold in adesicca

15、tor to cool to room temperature before testing. Where1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved Aug. 1, 2005. Published August 2005. Originallyapproved

16、in 1958. Last previous edition approved in 2000 as C 421 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1

17、Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.circumstances or requirements preclude compliance with theseconditioning procedures, exceptions agreed upon by the pur-chaser and the manufacturer may be made, but they shall bespecifica

18、lly listed in the test report.7. Procedure7.1 Conduct the test in the Standard LaboratoryAtmosphereat 73.4 6 1.8F (23 6 1C) and 50 6 5 % relative humidity.NOTE 2Other specimen conditioning procedures or test conditionsmay be selected to simulate actual-use conditions, upon agreementbetween the purch

19、aser and the manufacturer.7.2 Weigh the twelve conditioned test specimens on abalance to within 6 1%.7.3 Place the twelve specimens together with the 24 oakcubes in the clean test box and secure the lid tightly.7.4 Rotate the box at 60 6 2 r/min for 600 6 3 revolutions.7.5 Immediately after the test

20、 period, carefully empty thecontents of the box onto a38-in. (9.5-mm) mesh screen and tapgently to remove dust and small particles. Carefully remove thetwelve largest pieces of insulation from the screen and weighpromptly.7.6 Clean out the box between runs.7.7 If an additional test period is to be r

21、un, replace thetwelve weighed pieces into the box and repeat steps 7.3-7.5.8. Calculation8.1 Calculate the percent mass loss to two significant figuresusing Eq 1:Mass loss, % 5 M12 M2!/M1# 3 100 (1)where:M1= original mass, andM2= final mass.9. Report9.1 The report shall include the following:9.1.1 C

22、omplete description of the material tested, includingtype, source, and density, in accordance with Test MethodsC 167 or C 303, and special surfaces if any,9.1.2 Conditioning or drying procedures followed and spe-cial conditions employed in the test, if any,9.1.3 Date of test,9.1.4 Percent mass loss,

23、 and9.1.5 Comments on the mode and extent of abrasion,erosion, crumbling, cracking, etc.10. Precision and Bias310.1 PrecisionThe precision of this test method is givenin Table 1.10.1.1 Repeatability The difference between successiveresults obtained by the same operator with the same apparatusunder c

24、onstant operating conditions on identical test materialswould exceed the values given for repeatability in Table 1 onlyin one case in twenty.10.1.2 Reproducibility The difference between two singleand independent results obtained by different operators work-ing in different laboratories on identical

25、 material would exceedthe values given for reproducibility in Table 1 only in one casein twenty.10.2 BiasNo information can be presented on the bias ofthe procedure in this test method because no material having anaccepted reference value is available.11. Keywords11.1 mass loss; thermal insulating m

26、aterialsblock/board; tumbling friabilityASTM 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

27、 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 withdrawn. Your comments are invited either for revision of

28、 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 comments have not received a fair hearing you shouldm

29、ake 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 or multiple copies) of this standard may be obtained

30、 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).3Supporting data have been filed at ASTM Headquarters. Request ResearchReport RR:C16-1006.TABLE 1 PrecisionMaterialMassLoss (%)Repeatability

31、Reproducibility6 2.0 Sr6 2.0 Sr(%)6 2.0 SR6 2.0SRA(%)Rigid cellular A 0.11 0.34 309 0.40 364plastic B 1.00 0.65 65.0 0.83 83.0(Specimens = 3, C 5.3 1.6 30.9 4.2 79.3Laboratories = 6) D 31.4 2.6 8.2 8.5 27.1E 48.9 4.5 9.1 11.3 23.2F 49.6 5.3 10.7 10.8 21.8Calcium silicate(Specimen = 6,Laboratories = 4). 9.3 1.3 14.0 1.1 11.8Perlite(Specimens = 3,Laboratories = 5). 54.4 4.2 7.6 9.5 17.5ASr=repeatability standard deviationSR=reproducibility standard deviationC421052