Which of the following statements is/are CORRECT?
1)Thermoplastics are a class of polymers that will not decompose at temperatures as great as 700 $\circ$ C.
2)Thermosetting plastics harden when heated,but they regain their elasticity when cooled.
3)Elastomers are materials that spring back to their original shape when stretched.
A) 1 only
B) 2 only
C) 3 only
D) 1 and 2
E) 1,2,and 3

Question

Quizplus · Accepted Answer

Statement 1 is incorrect because thermoplastics can decompose at temperatures as low as 400°F (204°C). Statement 2 is incorrect because thermosetting plastics do not regain their elasticity when cooled, they become permanently hardened. Statement 3 is correct, elastomers are known for their ability to return to their original shape after being stretched. Therefore, only statement 3 is correct, making choice C the best answer.

Which of the Following Statements Is/are CORRECT? 1)Thermoplastics Are a Class

Which of the Following Statements Is/are CORRECT?
1)Thermoplastics Are a Class