1、Designation: D4907 10Standard Test Method forNitrocellulose in Finish on Leather1This standard is issued under the fixed designation D4907; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in pare
2、ntheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is intended for use in identifyingnitrocellulose in the finish on all types of leathers. This testmethod does not apply to wet blue.
3、1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard 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 appr
4、o-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Significance and Use2.1 This test method is used to identify nitrocellulose infinishes on all types of leathers.3. Apparatus3.1 Borosilicate Glass Watch Glass, 100 mm diameter.3.2 Reagent
5、Bottles, two, (4 fl oz each) equipped with glassjoint dropping pipet.4. Reagents4.1 Indicator solution prepared by dissolving 0.1 g diphe-nylamine in solution containing 100 mL of sulfuric acid and 30mL of distilled water.4.2 Blank solution comprising 100 mL of sulfuric acid and30 mL of distilled wa
6、ter.4.3 Acetone, C.P.4.4 Hazards StatementAll reagents and chemicals shouldbe handled with care. Before using any chemical, read andfollow all safety precautions and instructions on the manufac-turers label or MSDS (Material Safety Data Sheet).5. Test Specimen5.1 The test specimen shall be approxima
7、tely 1 cm2of thefinished leather.6. Procedure6.1 Place the test specimen in the watch glass with the finishside up. Apply one or 2 mL of indicator solution on the finishand allow to run over the side of the leather on to the watchglass. After 3 min, if the indicator solution does not develop adark b
8、lue color, then nitrocellulose is not present in the finish.If the indicator solution develops a dark blue color after contactwith the finish, it indicates the presence of nitrocellulose or hasdeveloped color from colored finish components, or both.6.2 Repeat the above procedure except that the blan
9、ksolution is employed instead of the indicator solution. If a darkblue color does not develop, whereas it does when the indicatorsolution is applied, then nitrocellulose is present in the finishand colored finishing materials do not interfere.6.3 If colored finish material develops a dark blue color
10、 inthe presence of the blank solution, then place the specimenfinish side up in a watch glass and pour acetone on thespecimen, until completely covered, for dissolving any nitro-cellulose present in the specimen. After allowing the specimento soak in acetone for approximately 2 min, remove thespecim
11、en from the watch glass and the evaporate acetone in thewatch glass on the steam oven to dryness. When cooled toroom temperature, place a few drops of indicator solution onone side of the watch glass near the rim and allow the drops torun downward. At another location on the watch glass, place afew
12、drops of blank solution near the rim and allow to rundownward. If nitrocellulose is present in the finish, a dark bluecolor will develop as the indicator solution runs downward intothe watch glass whereas the blank solution will not show anycolor development.7. Report7.1 The indicator method for tes
13、ting the presence of nitro-cellulose in finish on the leather shall be reported as positive ornegative.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on Chemical Analysis Thistest method was developed in cooperation
14、 with the American Leather ChemistsAssn. (Method K 5-1956).Current edition approved Nov. 1, 2010. Published December 2010. Originallyapproved in 1989. Last previous edition approved in 2005 as D4907 00(2005).DOI: 10.1520/D4907-10.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, Wes
15、t Conshohocken, PA 19428-2959, United States.8. Precision and Bias8.1 This test method is adopted from the procedures of theAmerican Leather Chemists Association where it has been inuse and where it was approved for publication before theinclusion of precision and bias statements were mandated. Theo
16、riginal interlaboratory test data is no longer available. Theuser is cautioned to verify by the use of reference materials, ifavailable, that the precision and bias of this method is adequatefor the contemplated use.9. Keywords9.1 finish; leather; nitrocelluloseASTM International takes no position r
17、especting 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 riskof infringement of such rights, are entirely their own responsibility.Thi
18、s 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 this standard or for additional standardsand should be addressed to ASTM Inte
19、rnational 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 shouldmake your views known to the ASTM Committee on Standards, at the address shown
20、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 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/).D4907 102
