Exorcise
22nd October 2007, 02:45
Rubber trees are trapped-that is, cuts are made in the bark so that the latex, a milk-like juice, containing 30-40% rubber, can be obtained. The latex is then processed by exposing it to heat and wood smoke, or by mechanical means, so as to seperate the rubber from the water, mineral salts, sugars, resinds and protein matters. The rubber obtained in this way is known as crude. Latex is extensively used in industry for making pure rubber products, footwear, dolls etc. Untreated crude rubber is naturally soft and lacks the required strenght for making into manufactured articles. To improve its strenght and usefulness, it is vulcanised, or heated with sulphur, and the proportion of sulphur used determines the hardness and elasticity of the rubber.
From its description, we can say that latex ................ .
a)is a hard substance similar to rubber
b)must be fairly thin, white liquid
c)is almost entirely pure rubber
d)is by-product of rubber
e)is less useful than crude rubber
els
sebebini açıklayarak analtırsanız sevinirim
From its description, we can say that latex ................ .
a)is a hard substance similar to rubber
b)must be fairly thin, white liquid
c)is almost entirely pure rubber
d)is by-product of rubber
e)is less useful than crude rubber
els
sebebini açıklayarak analtırsanız sevinirim