ASTM D2252-96(2005)

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Designation: D 2252 – 96 (Reapproved 2005)
Standard Specification for
Fineness of Types of Alpaca
This standard is issued under the fixed designation D 2252; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.3 fineness, n—of fibers, a relative measure of size,
diameter, linear density, or mass per unit length expressed in a
1.1 This specification is applicable in the classification of
variety of units.
alpaca into types according to fineness.
3.1.3.1 Discussion—The fineness of alpaca and other ani-
1.2 The values are stated in SI and inch-pound units. The
mal fibers is expressed as the average fiber width or average
inch-pound units in parentheses are to be regarded as the
fiber diameter in micrometres (µm).
standard. The values in each system are not exact equivalents,
3.1.4 For definitions of other textile terms used in this
therefore,eachsystemshallbeusedindependentlyoftheother.
specification, refer to Terminology D 123.
Combining values from the two systems may result in noncon-
formance with the specification.
4. Significance and Use
1.3 This standard does not purport to address all of the
4.1 This specification for fineness is intended as a guide for
safety concerns, if any, associated with its use. It is the
production, preparation, and marketing (Note 1) by comparing
responsibility of the user of this standard to establish appro-
the average fiber diameter of a measured specimen with the
priate safety and health practices and determine the applica-
fineness specifications for the various types listed in Table 1.
bility of regulatory limitations prior to use.
The standard deviation which expresses measured variability
2. Referenced Documents of a specimen may be compared with the average shown in
Table X2.1.
2.1 ASTM Standards:
D 123 Terminology Relating to Textiles
NOTE 1—Test Method D 2130 does not include any values for the
D 2130 Test Method for Diameter of Wool and Other
precision to be expected in the testing of alpaca fibers. In an interlabora-
tory test in which six laboratories each made one test on each of six type
Animal Fibers by Microprojection
samples, HTB-CB, HAXB-CB, HAAB-CB, HAB-CB, HLPB-CL, and
3. Terminology 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,
3.1 Definitions:
and 0.93 % for the respective alpaca types.
3.1.1 alpaca, n—the fleece and fiber produced by the
alpaca, an animal of the genus Llama (Lama glama pacus).
5. Specification
3.1.1.1 Discussion—There are two varieties of the alpaca
5.1 The fineness of various types of alpaca shall conform to
animal, the Huacaya and Suri. The Suri produces straighter,
the average fiber diameter limits listed in Table 1.
finer, and longer fibers, but most alpaca production is of the
Huacaya variety. Alpaca is normally classified according to
6. Sampling
type, representing particular combinations of characteristics
6.1 Sample the material as directed in Test Method D 2130.
appropriate to a specific use, or descriptive of geographic
origin, breed or species of animal, or preparation for market 7. Test Method
(see Appendix X1).
7.1 Test the material as directed in Test Method D 2130.
3.1.2 average fiber diameter, n—in wool and other animal
Measure at least the minimum number of fibers specified to
fibers,theaveragewidthofagroupoffiberswhenmeasuredon
attain confidence limits of the mean of 60.5 µm at
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