Standard Terminology Relating to
This standard is issued under the fixed designation D 4845; 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.
acid content, n—of felt, the number of milliequivalents of acid
present per unit weight of felt, measured under prescribed
conditions. D 461
alkali-solubility, n—in wool, the percent of clean wool that is
soluble in a specified alkaline solution under controlled
conditions of temperature and time. D 1283
alpaca, n—the fleece and fiber produced by the alpaca, an
animal of the genus Llama (Lama Glama pacus). The fiber is
obtained from several species, namely, Huacaya and Suri.
DISCUSSION—Alpaca is normally classified according to type, representing particular combinations of characteristics appropriate to a
specific use, or descriptive of geographic origin, breed or species of
animal, or preparation for market.
animal fiber, n—any natural protein-based fiber.
D 1574, D 4510
the aqueous extract, n—in wool testing, the solution obtained by
digesting a material with water or with a sodium chloride
solution to dissolve soluble materials. D 2165
average fiber diameter, n—in wool and other animal fibers,
the average width of a group of fibers when measured on a
projected image. D 2130, D 2252, D 3991, D 3992
black felt, n—those classifications of felt manufactured to
various shades of the color black. D 2475
breaking tenacity, n—the tenacity corresponding to the breaking load. D 1294, D 2524
DISCUSSION—Breaking tenacity is commonly expressed as grams force per tex (GF/tex), grams-force per denier (GF/den), millinewtons per
tex mN/tex), or millinewtons per denier (mN/den). Millinewtons are
numerically equal to grams-force times 9.81.
burr-wool waste, n—waste removed by the burr guard of
cards or burr pickers having a very short fiber and full of
burrs or seeds. D 4845
DISCUSSION—The nature of the waste varies according to the wool
from which the burrs are taken.
carbonized and neutralized wool, n—a term descriptive of
scoured wool processed to destroy cellulosic impurities by
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