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Definition of Cashmere

The Cashmere and Camel Hair Manufacturers Institute defines cashmere as:
• The fine (dehaired) undercoat fibers produced by a Cashmere goat (Capra hircus laniger).
• The fiber is generally non-medullated and has a mean diameter not exceeding 19 micron. The co-efficient of variation around the mean shall not exceed 24%. There can be no more than 3% (by weight) of cashmere fibers over 30 micron. (Reference IWTO Test Method 8).

The U.S. Wool Products Labeling Act of 1939, as amended, (U.S.C. 15 Section 68b(a)(6)) defines cashmere as:
(A) the fine (dehaired) undercoat fibers produced by a cashmere goat (capra hircus laniger);
(B) the average diameter of the fiber of such wool product not exceeding 19 microns; and
(C) containing not more than 3 percent (by weight) of cashmere fibers with average diameters that exceed 30 microns.
The average fiber diameter may be subject to a coefficient of variation around the mean that shall not exceed 24 percent.

Definition of Superfine Wool

The International Wool Textile Organization has codified fabric quality definitions relating to the use of "Super S" and "S" descriptions, stating:
Fabric Labelling Code of Practice: Quality Definitions Relating to "Super S" and "S" Description
Pure Wool Fabrics
The word SUPER (as in SUPER 100s for example) can only be used to describe fabrics made from pure new wool, and the "Super S" value is determined by, and must comply with, the Maximum Meam Fibre Diameter values in the following fable:

"Super S" Value Maximum Mean
Fibre Diameter
of Wool
"Super S" Value Maximum Mean
Fibre Diameter
of Wool
SUPER 80s 19.75 µm SUPER 170s 15.25 µm
SUPER 90s 19.25 µm SUPER 180s 14.75 µm
SUPER 100s 18.75 µm SUPER 190s 14.25 µm
SUPER 110s 18.25 µm SUPER 200s 13.75 µm
SUPER 120s 17.75 µm SUPER 210s 13.25 µm
SUPER 130s 17.25 µm SUPER 220s 12.75 µm
SUPER 140s 16.75 µm SUPER 230s 12.25 µm
SUPER 150s 16.25 µm SUPER 240s 11.75 µm
SUPER 160s 15.75 µm SUPER 250s 11.25 µm

The Test Methods to determine the Mean Fibre Diameter values are noted in the Regulation defining the Code of Practice.
Regulatory procedures controlling the operation of this Code of Practice are published in the White Book of IWTO Regulations.


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