ASTM_D_1283_-_05_2013.pdf

Designation:D128305(Reapproved 2013)Standard Test Method forAlkali-Solubility of Wools1This standard is issued under the fixed designation D1283;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 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 covers a chemical procedure fordetermination of the amount of wool substance soluble in alkaliunder standard conditions and is applicable to wool in scouredfiber form,or as fiber obtained from yarn or from woven ornonwoven fabric.1.2 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.NOTE1This test method is applicable to other animal fibers althoughthe level of alkali-solubility may be different from wool.With individualanimal fibers,undamaged solubility should be determined before attempt-ing to assess damage on an unknown sample.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 appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1060 Practice for Core Sampling of Raw Wool in Packagesfor Determination of Percentage of Clean Wool FiberPresentD1193 Specification for Reagent WaterD4845 Terminology Relating to WoolE1 Specification for ASTM Liquid-in-Glass ThermometersE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Terminology3.1 For all terminology relating to D13.13,Wool and WoolFelt,refer to Terminology D4845.3.1.1 The following terms are relevant to this standard:alkali-solubility,wool.3.2 For all other terminology related to textiles,see Termi-nology D123.4.Summary of Test Method4.1 Specimens are maintained at a stipulated constant tem-perature in a caustic solution for a specified period of time.Thepercentage of alkali-solubility is calculated from the loss inmass of the specimen.5.Significance and Use5.1 Alkali-solubility is an indication of the degree of dam-age to wool resulting from certain chemical treatments,par-ticularly when test results on the same wool,before suchtreatment,are available.5.1.1 Undamaged scoured wool has typical alkali-solubilityin the range of 9 to 15%.Fine,undamaged wool normally willexhibit higher solubility than coarse wool,because of greatersurface area per unit mass of fiber.5.2 This test method is not recommended for use on woolknown to have sustained alkali damage.5.2.1 Alkali-damaged wool has had material solubilized thatordinarily would be included in the alkali-solubility test results.5.3 Although results in one laboratory cannot usually beverified in another laboratory,this test method is consideredsatisfactory for acceptance testing because it has been usedextensively in the trade for this purpose and because it is theonly available method for assessing damage to wool by analkali solubility procedure.Comparative tests as directed in5.3.1 are advisable before Test Method D1283 is used foracceptance testing.5.3.1 In case of a dispute arising from differences inreported test results when using Test Method D1283 foracceptance testing of commercial shipments,the purchaser andthe supplier should conduct comparative tests to determine ifthere is a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens which are as homogeneous as possible and whichare from a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average result from the two1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.13 on Wool and Felt.Current edition approved Jan.1,2013.Published January 2013.Originallyapproved in 1953.Last previous edition approved in 2005 as D1283 05.DOI:10.1520/D1283-05R13.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 laboratories should be compared using Students t-test forunpaired data and an acceptable probability level chosen by thetwo parties before testing is begun.If a bias is found,either itscause must be found and corrected or the purchaser and thesupplier must agree to interpret future test results in th