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Significance and Use
5.1 Test Method D1113 is considered satisfactory for acceptance testing of commercial shipments, and the procedure has been used extensively in the trade for this purpose, particularly in connection with the determination of clean wool fiber present by Test Method D584. The procedure in Test Method D1113 is used by the U.S. Customs Service for the determination of the vegetable matter in importations of raw wool on which the allowance for loss of wool during commercial cleaning is based in part.3
5.1.1 In case of a dispute arising from differences in reported test results when using Test Method D1113 for acceptance testing of commercial shipments, the purchaser and the supplier should conduct comparative tests to determine if there is a statistical bias between their laboratories. Competent statistical assistance is recommended for the investigation of bias. As a minimum, the two parties should take a group of test specimens that are as homogeneous as possible and that are from a lot of material of the type in question. The test specimens should then be randomly assigned in equal numbers to each laboratory for testing. The average results from the two laboratories should be compared using Students t-test for unpaired data and an acceptable probability level chosen by the two parties before the testing is begun. If a bias is found, either its cause must be found and corrected or the purchaser and the supplier must agree to interpret future test results in light of the known bias.
1.1 This test method covers the determination of the content of oven-dried, ash-free, alcohol extractive-free vegetable matter and other alkali-insoluble impurities present in scoured wool. It is also applicable to “related fibers” such as the hair from the goat, camel, alpaca, and other animals.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific safety hazard statements, see Section 8.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D123 Terminology Relating to Textiles
D584 Test Method for Wool Content of Raw Wool--Laboratory Scale
D1334 Test Method for Wool Content of Raw Wool--Commercial Scale
D2720 Practice for Calculation of Commercial Weight and Yield of Scoured Wool, Top, and Noil for Various Commercial Compositions
D4845 Terminology Relating to Wool
ICS Number Code 59.060.10 (Natural fibres)
UNSPSC Code 11151508(Wool fibers)