ASTM-D2816:2009 Edition

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D2816-05(2009) Standard Test Method for Cashmere Coarse-Hair Content in Cashmere

Published By	Publication Date	Number of Pages
ASTM	2009	3

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Categories: 59.060.10 - Natural fibres, ASTM

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Description

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 1For the maximum allowable cashmere coarse-hair content in cashmere, refer to Specification D 2817 .

Note 2For the quantitative analysis of cashmere hair and blends of cashmere hair and other fibers, refer to Test Methods D 629 .

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 D 629 .

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 and health practices and determine the applicability of regulatory limitations prior to use.

TABLE 1 Sequential Accept-Reject Numbers for Selected Specifications ^A

^A These accept-reject numbers are based on the following conditions:

(1) The probability of accepting a lot that exceeds the specifications by 10 % or more of the specification percent is 0.05.

(2) The probability of rejecting a lot that is 10 % or more of the specification percent below the specification is also 0.05.

^B Extensive interlaboratory tests have shown that, for the concentration of cashmere coarse-hair covered in Table 1, the relationship between Specification, Length Percent and mass percent of cashmere coarse-hair is approximately linear, as shown in (Eq 1):

The data from these studies are on file with the Secretary of Subcommittee D13.13, Committee D13 of ASTM.

^C Blanks correspond to a theoretical number less than zero. No decision to accept can be made until a number of fibers corresponding to the first nonblank entry has been classified.