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The temperature at which plastics begin to become softer and defer under a load is known as _________

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in Engineering Material & Metallurgy by (773k points)
The temperature at which plastics begin to become softer and defer under a load is known as _________

(a) Softening point

(b) Melting point

(c) Eutectic point

(d) Heat distortion point

This question was posed to me by my school principal while I was bunking the class.

The question is from Thermal Properties in section Properties of Engineering Materials of Engineering Material & Metallurgy

1 Answer

+1 vote
by (1.3m points)
The correct choice is (d) Heat distortion point

Easy explanation: Heat distortion point is the temperature at which plastics begin to become softer and defer under a load. The softening point is the temperature at which a flat-ended needle of 1 mm^2 penetrates the test same at 1 mm^2 depth. Eutectic point the temperature at which a mixture freezes or melts. The melting point is the temperature at which the state of the body changes from solid to liquid.

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