Norm

ASTM D2816-05(2009)

Standard Test Method for Cashmere Coarse-Hair Content in Cashmere

48,24

Over deze norm

Status Definitief
Aantal pagina's 3
Commissie D13.13
Gepubliceerd op 01-07-2009
Taal Engels

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 D 2817.

Note 2—For 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 SpecificationsA

Number of Fi-
bers Counted
Specification, Length %B
0.20.30.40.50.60.70.80.91.0
ARARARARARARARARAR
1 000...C17...18...19...20...21...22...23... 24... 25
2 000...19...21...23...25...27...29 131 3 33 5 35
3 000...21...24...27 030 333 636 93912 4215 45
4 000...23...27 131 535 9391343174721 5125 55
5 000...25 030 535104015452050255530 6035 65
6 000...27 333 939154521512757336339 6945 75
7 000...29 6361343205027573464417148 7755 85
8 000131 9391747255533634171497957 8665 95
9 00033312422151306039694878578766 9575105
10 0005351545255535654575558565957510485115

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):



where:
M= mass percent of cashmere coarse-hair, and
S= specified maximum coarse-hair content in length percent (0.2 S 1.0).

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.

Details

ICS-code 59.060.10
Nederlandse titel Standard Test Method for Cashmere Coarse-Hair Content in Cashmere
Engelse titel Standard Test Method for Cashmere Coarse-Hair Content in Cashmere

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