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UF
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See: Ultrafiltration.
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Ultrafiltration (UF)
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Process based on separation by
membranes, which retains particles of between 0,001 micron and
0,1 micron, making it possible to produce extremely pure drinking
water.
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Ultraviolet (UV)
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Ultraviolet radiation.
The light of the wavelength in spectrum region below the blue
visible light.
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Unborn lambskin (new-born)
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Skin of an unborn, or new-born,
lamb, usable as fur.
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Underfur dyeing
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Dyeing of the layer of fine,
closely packed, soft hair forming the insulating layer of the
fur coat of fur-bearing animals.
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Undressed leather
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Leather which, after tanning,
has not been further processed and may be in the wet or dry
state.
Note: In Western Europe this
leather is known as "Leather, simply tanned".
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Undyed
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Not having been subjected to
the action of a dye.
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Uneven finish
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General
term used to describe a patchy, blotchy, unlevel appearance
to the surface finish.
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Unhair (v); unhairing
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Removal of hair or wool from
hides or skins by any method.
See: Depilation.
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Unhairing before flaying
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Removal of the hair from the
carcass before the hide is opened up to remove the meat.
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Unhairing knife
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Mechanical instrument for manual
unhairing.
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Unhairing, hair-burning/destroying/dissolving/pulping
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Method of dehairing whereby the
hair is destroyed.
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Unsaponifiable
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Substances which cannot be converted
into a soap by the action of an alkaline solution. Note: In
liming operation.
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Unsaponifiable fatty matter
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Portion of oil, fat, wax, or
grease, which is not converted into soap on boiling with alkali
solution and is soluble in a solvent such as diethyl ether.
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Unsaturated acid
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Fatty acid derived
from the unsaturated series of aliphatic hydrocarbons, containing
one or more unsaturated bonds.
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Unsaturated brine
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Solution of water and salt (brine)
that has, at 25 oC, a specific gravity under 1,198
or contains less than
36,0 g of salt per
100,0 g of water.
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Unsaturated fatty acid
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Fatty acid which has one or more
double bonds in the carbon chain. Organic compound with the
chemical formula Cn H2n-1 COOH, Cn
H2n-3 COOH, etc.
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Unstrain (v); unstraining
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Removal of dried, strained leather
from the straining boards or frames.
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Upholstery leather
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Leather for covering furniture
and seats of all kinds; mainly large, chrome tanned, or chrome
retanned, grain split cattle hide leather.
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Upper leather
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Leather produced for the outside
upper part of footwear.
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Uppers
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Outer part of footwear above
the sole and enveloping the foot.
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Urine damage
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Urine
can damage the grain giving it an unevenly roughened, velvet-like
texture instead of the normal smooth grain. This is particularly
prominent in calf skins.
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UV
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See: Ultraviolet.
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UV stability
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Resistance to any
modification by ultraviolet radiation, for example, colour change
in leather.
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