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%ما هو (من)٪ 1 - تعريف
WIKIMEDIA DISAMBIGUATION PAGE
Urethane (disambiguation); Urethan
urethane
['j??r??e?n, j?'r??e?n]
¦ noun
1. Chemistry ethyl carbamate, a synthetic crystalline compound which is used to make pesticides and fungicides.
2. short for polyurethane.
Origin
Urethane
·noun A white crystalline substance, NH2·CO·OC2H5, produced by the action of ammonia on ethyl carbonate. It is used somewhat in medicine as a hypnotic. By extension, any one of the series of related substances of which urethane proper is the type.
II. Urethane ·add. ·noun A white crystalline substance, NH2·COOC2H5, produced by the action of ammonia on ethyl carbonate or by heating urea nitrate and ethyl alcohol. It is used as a hypnotic, antipyretic, and antispasmodic. Hence, any ester of carbamic acid.
Spar varnish
WOOD-FINISHING VARNISH
Spar urethane; Boat varnish; Yacht varnish
Spar varnish (occasionally also called boat varnish or yacht varnish) is a wood-finishing varnish, originally developed for coating the spars of sailing ships. These formed part of the masts and rigging, and had to withstand rough condition, being flexed by the wind loads they supported, attacked by sea and bad weather, and suffering from UV degradation from long-term exposure to sunlight.
ويكيبيديا
Urethane
Urethane may refer to:
- Ethyl carbamate, a chemical compound which is an ester of carbamic acid
- Polyurethane, a polymer composed of a chain of organic units joined by carbamate (urethane) links
- Carbamate, an organic compound derived from carbamic acid
