SHORTCOMINGS
OF PLASTIC
Though the plastics have found a
wider application range, plastics do have some shortcomings. These are….
1. Lower
Melting point and low heat resistance: Most of the plastics have low melting
point and, have low heat resistance. Due
to this, hot liquids/hot foods cannot be stored. Also plastic articles are
needed to be protected form hot materials or fire.
2. Lower Hardness:
The plastics are not that hard and have low scratch resistance.
3. Gradual disintegration:
The plastics gradually disintegrate and become dull over a period of time. This
disintegration is due to atmospheric effects of sun, rain, wind and temperature
variations. Due to this disintegration,
the luster of surface finish is lost and the article looses its attractive
appearance.
4. Creep: The
plastics exhibit high creep. In other words, plastics deform due to frequent
loads it sustains.
5. Thermal expansion:
The coefficient of thermal expansion for plastics is high and due to this,
moderate temperature variations will affect the size and shape of articles.
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