ASTM D7477-2008 895 Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water《测定淹没在沸水中蓝湿皮的区域稳定性的标准试验方法》.pdf
《ASTM D7477-2008 895 Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water《测定淹没在沸水中蓝湿皮的区域稳定性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D7477-2008 895 Standard Test Method for Determining the Area Stability of Wet Blue Submersed in Boiling Water《测定淹没在沸水中蓝湿皮的区域稳定性的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 7477 08Standard Test Method forDetermining the Area Stability of Wet Blue Submersed inBoiling Water1This standard is issued under the fixed designation D 7477; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year
2、 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 test method provides a standard procedure fordetermination of the dimensional stability or area shrinkage ofa
3、 specimen of wet blue that is submersed in boiling water fora specified time period. This test method is applicable to alltypes of wet blue.1.2 The values given in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.3 This standard does not
4、 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 ASTM Standards
5、:2D 6659 Practice for Sampling and Preparation of Wet Bluefor Physical and Chemical TestsE 691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE 177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3. Summary of Test Method3.1 A sample cu
6、tting of wet blue is either taken directly outof the tanning drum or else is pre-soaked in water for 30 minor until it is completely re-hydrated (see 9.1 for details onre-hydration). The specimen to be tested is cut out from thisthoroughly hydrated sample cutting. The test specimen is thentotally su
7、bmerged and suspended in boiling water. The testspecimen is removed 3.0 min after the water temperaturereaches 100C and begins to re-boil. As soon as the specimenhas cooled sufficiently to allow comfortable handling the arealoss is determined.4. Significance and Use4.1 Determination of the hydro-the
8、rmal area stability of wetblue provides information concerning the efficacy of thetanning process as well as the adequacy of the wet blue forintended end use applications where area stability is a particu-lar requirement. Relative area stability of chrome-tannedleather is a requirement for many appl
9、ications such as book-binding, shoe and boot components, upholstery, seals andgaskets, etc.4.2 This test method is suitable for use in development workand process control in the tannery and for specification testingof wet blue for domestic and international commercial pur-poses.5. Apparatus5.1 Beake
10、r, standard, IL capacity. Other suitable containersmay be used so long as the dimensions are sufficiently large toenable suspension of the completely immersed test specimenwith no contact occurring with the sides and bottom of thecontainer during the test. Particularly when non-standard testspecimen
11、s are used, the size and shape requirements of thecontainer are dependent on the dimensions of the specimen tobe tested.5.2 Thermometer, with a minimum scale reading to +110C,graduated in 1C, and having a 0.5C tolerance.5.3 Timer, with minimum 3 min capacity and 1.0 s resolu-tion.5.4 Metal die, to c
12、ut specimens. The die should be con-structed of highly corrosion resistant alloy metal and must bemaintained in a clean and sharp condition to minimize distor-tion of the wet blue sample that may occur during the specimencutting operation. The recommended specimen is a square 76.2by 76.2 mm (3.00 by
13、 3.00 in.). However, other size and shapespecimens can be used so long as the requirements of Section8 are met.5.5 Measuring scale, ruler longer than the greatest dimen-sion of the test specimen, divided in millimeters (132 in.).5.6 Marking pen, Suitable water-proof marker or pen formarking the indi
14、cator points, on the hydrated wet blue grainsurface, to be used for measuring the specimen dimensions.1This test method is under the jurisdiction ofASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.02 on Wet Blue.Current edition approved Sept. 1, 2008. Published Septe
15、mber 2008.2For 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.1Copyright ASTM International, 100 Barr Harbor Driv
16、e, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Reagents and Materials6.1 Water, distilled or de-ionized laboratory water should beused, especially if there is any possibility of constituents in theavailable tap water affecting the results of this test.6.2 Glycerin (Glycerol), tec
17、hnical grade is adequate.6.3 Salt (Sodium Chloride), common table salt is adequate.7. Hazards7.1 All reagents and chemicals should be handled with care.Before using any chemical, read and follow all safety precau-tions and instructions on the manufacturers label or MSDS(Material Safety Data Sheet).8
18、. Test Specimen8.1 The original sample cutting to be pre-soaked and the testspecimen cut from it shall be taken from the wet blue accordingto Practice D 6659. Specifically, for a hide or side the cuttingshall be taken from the “a” test area (the kidney area) of a hideor side. The number of samples t
19、o be tested shall be asdescribed in Practice D 6659 and need not be more than 12 per50 000 ft2of wet blue stock.8.2 The sample cutting taken from the wet blue should belarge enough to permit the test specimen to be cut out with afresh edge no closer than 13 mm (0.5 in) to an edge of theoriginal cutt
20、ing. The sample cutting from which the testspecimen should be taken, should have minimum dimensionsof approximately 101 by 101 mm (4 by 4 in.). A cutting takenstraight out of the tanning drum prior to wringing need not bepre-soaked and the test specimen can be cut out directly fromthis sample cuttin
21、g. A cutting taken from wet blue at any pointfrom the wringing operation forward will need to be pre-soaked (see 9.1 for details on re-hydration). The standard testspecimen shall be a square 76.0 mm (3.00 in.) on edge. Othersize and shape specimens can be used. It is recommended thatfor non-standard
22、 test specimens the minimum dimension (for aside of a rectangle or diameter of a circle ) be 51.0 mm (2.0 in.)and the maximum dimension (for a side or diameter ) be 102mm (4.0 in.). Before a test specimen of non-standard dimen-sions may be used with this test method it must be rigorouslydemonstrated
23、 that the non-standard specimen gives identicalresults to that of the standard specimen for the particular wetblue being tested.NOTE 1As an example of a non-standard specimen, a convenient sizefor test specimens could be a square exactly 100 mm on edge. Then, onthis specimen, a loss of 1 mm in each
24、dimension is approximately (but notexactly) equal to 1 % loss in area. For instance, if a specimen experienceda loss of 4 mm in one dimension (actual measurement after the test was96 mm determined by averaging the measured length of the two edgesparallel to that dimension) and a loss of 6 mm in the
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