1、Designation: D6659 10 (Reapproved 2015)Standard Practice forSampling and Preparation of Wet Blue for Physical andChemical Tests1This standard is issued under the fixed designation D6659; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers the sampling and preparation of wetblue for physical and chemical tests. The prod
3、uct is groupedinto lots that are randomly sampled in such a manner as toproduce a representative sample of the lot. This sample may beused to determine compliance of the lot with applicablespecification requirements, and on the basis of results, the lotmay be accepted or rejected in its entirety.1.2
4、 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associa
5、ted 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 ASTM Standards:2D6658 Test Method for Volatile Matter (Moisture) of WetBlue
6、by Oven Drying3. Terminology3.1 Definitions:3.1.1 lot (or batch), nunits of products from a single type,grade, class, size, and composition, manufactured under essen-tially the same conditions and time.3.1.1.1 DiscussionWet blue in formed lots should beproduced from: (1) Units of product of similar
7、size and type.(2) Chromium tanning material obtained from the same pro-ducer (or functionally equivalent). (3)Asingle product method.(4) Sequential production batches.3.1.2 unit, na piece of wet blue in the form in which it ispurchased, such as a single hide, skin, or any part thereof.4. Significanc
8、e and Use4.1 The sampling procedures described in this practice havebeen designed to ensure random sampling of wet blue forphysical and chemical tests. Wet blue is a natural product andas such is subject to extensive variability. The physical andchemical properties vary considerably depending on loc
9、ationon the hide, side, or skin from which the test sample is taken.Random sampling of specimens from a predefined location andorientation minimizes test bias and variability. This practicedefines these parameters.5. Conditioning5.1 Unless otherwise specified in the applicable test method,specificat
10、ion, or procurement document, samples shall betempered to the ambient laboratory conditions prior to prepa-ration of testing.6. Sampling Procedure6.1 Prior to sampling, identify the product properly as a lotor batch.6.2 Select units from locations scattered throughout the lot,not from the same porti
11、on of the lot, such as a single pallet,carton, layer, etc. Take without regard to quality.6.2.1 The number of samples taken depends on the reliabil-ity of the test results, the deviation of the properties, and theerror of the testing procedure. The number of samples takenmay be at the discretion of
12、the user and the related test methodand should also be recorded on the test report. It is recom-mended that 12 samples be taken for every 50,000 square feetof hide or skin. These 12 shall be considered a lot, or batch.NOTE 1By reason of the high moisture content of wet blue, samplesshould be taken a
13、fter the wringing operation and immediately sealed inairtight plastic wrap. Store in a cool place until used.6.3 The standard location for sampling wet blue is thekidney area (designated as TEST AREA “ a”inFig. 1).Sampling in the belly or shoulder area is only applicable if thatis the end product be
14、ing sold or purchased:6.3.1 SkinsCut the test piece to the size and shape requiredfor the tests to be made, with one edge parallel to and 1 in.1This practice is under the jurisdiction ofASTM Committee D31 on Leather andis the direct responsibility of Subcommittee D31.02 on Wet Blue.Current edition a
15、pproved Dec. 1, 2015. Published December 2015. Originallyapproved in 2001. Last previous edition approved in 2010 as D6659 10. DOI:10.1520/D6659-10R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
16、dards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1(25.4 mm) from the backbone line, beginning 3 in. (76 mm)from the root of the tail. Pieces shall
17、 be cut from only one sideof the backbone of each skin. The test area for skins corre-sponds to area a for cattlehides of Fig. 1.6.3.2 CattlehidesThe location and size of cutting shall beas follows:6.3.2.1 Hides, Sides, Crops, Backs, and BendsCut the testpiece to the size and shape required for the
18、test to be made,with one edge parallel to and 2 in. (51 mm) from the backboneline beginning 5 in. (127 mm) from the root of the tail. In mostinstances, test piece “a” may be cut 8 in. (203 mm) by 8 in.(203 mm). Sample double bends, belting butts, and hides ononly one side of the backbone (see Fig. 1
19、, test area “a”).6.3.2.2 BelliesCut out the test piece, X, 5 in. (127 mm)wide and 7 in. (178 mm) long with one long edge parallel toand 1 in. (25.4 mm) from the belly line, DF,inFig. 1. Locatethe test cutting at the middle of the piece midway betweenpoints D and F.6.3.2.3 Double ShouldersCut out the
20、 test piece, Y,5by7in. (127 by 178 mm) with a long edge parallel to and 1 in. (25.4mm) from the shoulder line, BE. Locate the test cutting at themiddle of the piece between B and E.6.3.2.4 Cut out each test specimen with its long dimensionperpendicular to the backbone line, unless otherwise specifie
21、din the corresponding test method.6.3.2.5 When several specimens are required from eachpiece, cut them out in the following order beginning at the endnearest the tail: tensile strength and elongation (dumbbell),breaking strength (grab), bursting strength, stitch tear, shrink-age temperature, tongue
22、tear, stiffness.6.3.2.6 When cutting specimens for physical tests, areasselected must be free from visual defects such as cuts,scratches, and other obvious flaws.7. Sampling Preparation7.1 Time is crucial in the preparation of wet blue forchemical analysis. The following dicing procedure should bedo
23、ne in 2 min. or less for each individual sample to preventsignificant moisture loss.7.1.1 Samples must be cut on a non-porous, non-absorbinghard surface using a clean sharp cutting tool, preferably with anew razor or scalpel blade. Avoid excess pressure on thesample, which could force moisture out o
24、f the wet blue.NOTE 2Both Method A and Method B are acceptable for thepreparation of wet blue and wet white for chemical tests.7.2 Method AAs received in wet state, diced.7.2.1 Samples should be cut into 3 to 5 mm squares leavingno original cut edges.7.2.2 Immediately place diced samples into an air
25、tight glassor plastic container. This container must be large enough topermit preparation of a composite sample by freely mixing lotsamples, and yet have a minimum amount of airspace toprevent evaporation.7.2.3 Store at room temperature, away from heat or directlight.7.2.4 All chemical analyses shal
26、l be taken from the com-posite sample and be performed in duplicate.7.3 Method BOven or air dried, ground.7.3.1 Samples should be cut into approximately12 by 2 in.(12.7 by 50.8 mm) strips, leaving not original cut edges.NOTE 3If total moisture will be reported for the sample, obtainrepresentative st
27、rips and proceed immediately to Test Method D6658, step7.1 (use pre-dried weighing containers as specified).7.3.2 Dry the remaining strips at 125 6 1C (257 6 1.8F)for 1-4 h or air-dry the strips overnight on the counter.7.3.3 Grind the dried strips in a cutter mill with a 4-mmdiameter mesh sieve. Mi
28、x ground and sieved samplethoroughly, and store this composite sample at room tempera-ture in a clean, dry, and airtight container, away from heat ordirect light, until used for chemical analysis.7.3.4 All chemical analyses shall be taken from the com-posite sample and be performed in duplicate.FIG.
29、 1 Location of Test AreaD6659 10 (2015)28. Keywords8.1 blue stock; chemical tests; lot; physical tests; sampling;unit; wet blue; wet whiteASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this st
30、andard 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 must be reviewed every five years a
31、ndif 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 theresponsible technical committee,
32、 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 C700, West Conshohocken, PA 19428-29
33、59,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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 10 (2015)3
