This specification is applicable in the classification of alpaca into types according to fineness. Five types of alpaca have been classified according to its average diameter limit, namely Type T Extra, Type T, Type X, Type AA, Type A, Type SK, and Type LP.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
Significance and Use
This specification for fineness is intended as a guide for production, preparation, and marketing (Note 1) by comparing the average fiber diameter of a measured specimen with the fineness specifications for the various types listed in Table 1. The standard deviation which expresses measured variability of a specimen may be compared with the average shown in Table X2.1.
Note 1—Test Method D 2130 does not include any values for the precision to be expected in the testing of alpaca fibers. In an interlaboratory test in which six laboratories each made one test on each of six type samples, HTB-CB, HAXB-CB, HAAB-CB, HAB-CB, HLPB-CL, and HSKB-CL, the coefficient of variation of the average fiber diameters between laboratories, including test variation, was 3.2, 4.7, 3.8, 4.5, 2.2, and 0.93 % for the respective alpaca types.
TABLE 1 Fineness Specifications for Types of Alpaca
| Type||Average Diameter, μm|
|T Extra|| under 22.00|
|T|| 22.00 to 24.99|
|X|| 22.00 to 24.99|
|AA|| 25.00 to 29.99|
|A|| 30.00 to 35.99|
|SK|| over 30.00|
|LP|| over 30.00|
1.1 This specification is applicable in the classification of alpaca into types according to fineness.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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.
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
D2130 Test Method for Diameter of Wool and Other Animal Fibers by Microprojection
D4845 Terminology Relating to Wool
alpaca; animal fibers (except wool); fineness; Alpaca; Animal fibers; Fineness--grade assignment; Grading--textiles; Textile fabrics/fibers--specifications; Yarn number;
ICS Number Code 59.060.10 (Natural fibres)
ASTM International is a member of CrossRef.
Citing ASTM Standards
[Back to Top]