Thermoplastic materials are those materials which

[A].	are formed into shape under heat and pressure and results in a permanently hard product
[B].	do not become hard with the application of heat and pressure and no chemical change occurs
[C].	are flexible and can withstand considerable wear under suitable conditions
[D].	are used as a friction lining for clutches and brakes

Answer: Option B

Explanation:

No answer description available for this question.