Plastics is made from plastic as main raw
materials processing of living supplies, industrial supplies.
Compared with other materials, plastic has
the performance characteristics of the following aspects:
1. Light weight plastic is lighter
material, relative density distribution is between 0.90 2.2. Obviously, the
plastic can float to the surface of the water? Foamed plastics, in particular,
because there a microporous, quality of a material is lighter, relative density
0.01. This makes the plastic can be used to reduce the weight of the product
production.
2. Excellent chemical stability The vast
majority of plastic of acid, alkali and other chemicals have good corrosion
resistance. Especially commonly known as king plastic for ptfe (F4), its
chemical stability is better than gold, even in the "aqua regia"
boiled over ten hours also can't bad. Because the F4 has excellent chemical
stability, is the ideal of corrosion resistant material. Such as F4 transport
corrosive and viscous liquid can be used as the material.
3. The excellent electrical insulation
properties Common plastic is a poor conductor of electricity, its surface
resistance and volume resistance is very big, with Numbers of up to 109 a 1018
ohms. The breakdown voltage, dielectric loss Angle tangent value is very small.
As a result, the plastic in the electronic industry and mechanical industry has
been widely used. Such as plastic insulated control cables.
4. A poor conductor of heat, with noise
elimination and damping effect Generally speaking, the thermal conductivity of
the plastic is relatively low, quite steel 1/75-1/225, the microporous foam
contains gas, its better heat insulation, sound insulation, shockproof sex.
Such as polyvinyl chloride (PVC) thermal conductivity was only about 1/357 of
the steel, aluminum 1/1250. On insulating ability, single glass window plastic
is 40% higher than the single glass window aluminum, 50% higher than double
glass. Will be combined with hollow glass, plastic form used in residential,
office, room, hotel, save central heating in the winter and summer air
conditioning saving costs, benefits obviously.
5. Wide distribution and high mechanical
strength than strength Some plastic as hard as a stone, steel, and some soft
such as paper, leather; From the plastic hardness, tensile strength, elongation
and impact strength mechanical properties, such as wide distribution, there is
a lot of use of choice. Because of the proportion of plastic small, strength,
and thus has high specific strength. Compared with other materials, plastic
also exists obvious shortcoming, such as easy burning, high stiffness than
metal, aging resistance is poor, no heat, etc.
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