Specific gravity of plastics is usually less than specific gravity of metals - Manufacturing Processes - 1

Q.  Specific gravity of the plastics is usually
- Published on 03 Aug 15

a. less than the specific gravity of metals
b. more than the specific gravity of metals
c. similar to the specific gravity of metals
d. Unpredictable

ANSWER: less than the specific gravity of metals

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    Discussion

  • Pankaj   -Posted on 30 Oct 15
    - Specific gravity is one of the characteristics of plastics which depend upon molecular structures and degree of polymerization of the plastic.

    - Specific gravity of the plastic is usually less than that of the metals.

    - Generally, plastics are lighter and have specific gravity between 0.9 to 3.0 compared to 3.0 to 12.0 for metals.

    - The strength to weight ratio of plastics compared favourably with many light alloys.

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