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ASTM D2816-18
Standard Test Method for Cashmere Coarse-Hair Content in Cashmere
NORMA vydaná dňa 1.7.2018
Informácie o norme:
Označenie normy: ASTM D2816-18
Dátum vydania normy: 1.7.2018
Kód tovaru: NS-856836
Počet strán: 3
Približná hmotnosť: 9 g (0.02 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Kategórie - podobné normy:
Anotácia textu normy ASTM D2816-18 :
Keywords:
animal fibers (except wool), content,, ICS Number Code 59.060.10 (Natural fibres)
Doplňujúce informácie
| Significance and Use | ||||||||||
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5.1 This test method may be used for determining compliance with a specification for maximum cashmere coarse-hair content and is required to be used for determining compliance with Specification D2817. 5.1.1 In case of a dispute arising from differences in reported test results when using Test Method D2816 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 Student's 5.2 When the product being tested has a cashmere coarse-hair content that departs significantly either way from the specified amount, the sequential test procedure described herein will result in a substantial reduction in the number of observations required for a decision at the stated level of confidence. On the other hand, when the product being tested has a cashmere coarse-hair content that approaches the specified amount, the sequential procedure ensures that the necessary increased number of observations shall be made to secure a correct decision at the stated level of confidence. |
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| 1. Scope | ||||||||||
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1.1 This test method covers a sequential procedure for determining whether or not the cashmere coarse-hair content of a sample exceeds a specified value. Note 1: For the maximum allowable cashmere coarse-hair content
in cashmere, refer to Specification D2817.
Note 2: For the quantitative analysis of cashmere hair and
blends of cashmere hair and other fibers, refer to Test Methods
D629.
1.2 This test method is applicable only to cashmere hair in the form of roving, yarn, or fabric, and to the cashmere hair content of blends with other fibers, where the expected cashmere coarse-hair content is not more than five mass percent (see Footnote C of Table 1). For greater expected mass percentages of cashmere coarse-hair, see Test Methods D629. The data from these studies are on file with the Secretary of Subcommittee D13.13, Committee D13 of ASTM. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||||
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