Standard Specifications for
The fineness of Wool Top or Mohair Top and Assignment of
Grade1
This standard is issued under the fixed designation D 3992; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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
1.1 These specifications are applicable in the classification,
by fineness grade, of the fiber in the wool top, mohair top, wool
yarns, mohair yarns, wool fabrics, and mohair fabrics of the
worsted type.
NOTE 1—For fineness specifications for wool, mohair, and alpaca, refer
to Specifications D 3991 and D 2252.
2. Referenced Documents
2.1 ASTM Standards:
D 123 Terminology Relating to Textiles2
D 2130 Test Method for Diameter of Wool and Other
Animal Fibers by Microprojection2
D 2252 Specification for Fineness of Types of Alpaca2
D 3991 Specifications for Fineness of Wool or Mohair and
Assignment of Grade3
2.2 Federal Standards:
Official Standards of the United States for Grades of Wool
Top, Section 31.1004
Measurement Method for Determining Grade of Wool Top,
Section 31.3014
Official Standards of the United States for Grades of Mohair
Top, Section 32.1005
Measurement Method for Determining Grade of Mohair
Top, Section 32.3025
3. Terminology
3.1 Definitions:
3.1.1 average fiber, diameter, n— in wool and another animal
fibers, the average width of a group of fibers when measured on
a projected image.
3.1.2 fineness, n—of textile fibers, a relative measure of
size, diameter, linear density, or mass per unit length expressed
in a variety of units.
Click below to download Astm D 3992 – 94 (Reapproved 2000) pdf free
