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ASTM D2252-05(2009)

Historical Revision

Standard Specification for Fineness of Types of Alpaca

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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.

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 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

TypeAverage 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

SDO ASTM: ASTM International
Document Number D2252
Publication Date July 1, 2009
Language en - English
Page Count 3
Revision Level 05(2009)
Supercedes
Committee D13.13
Publish Date Document Id Type View
July 1, 2018 D2252-18 Revision
July 1, 2009 D2252-05R09 Revision
March 1, 2005 D2252-05 Revision
Dec. 10, 1996 D2252-96 Revision
Jan. 1, 2005 D2252-96R05 Reaffirmation