ASTM D2252 - 05(2009)

    Standard Specification for Fineness of Types of Alpaca

    Active Standard ASTM D2252 | Developed by Subcommittee: D13.13

    Book of Standards Volume: 07.01


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    Abstract

    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

    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

    1. Scope

    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.

    ASTM Standards

    D123 Terminology Relating to Textiles

    D2130 Test Method for Diameter of Wool and Other Animal Fibers by Microprojection

    D4845 Terminology Relating to Wool


    ICS Code

    ICS Number Code 59.060.10 (Natural fibres)

    UNSPSC Code

    UNSPSC Code 11151500(Fibers)


    DOI: 10.1520/D2252-05R09

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