Question

post-test
which of the following identifies a material as a thermoplastic?
a. it burns when it is welded.
b. it has a pp or tpo mark.
c. it retains its form when heated.
d. it powders when you grind it.

Explanation:

To determine a thermoplastic, we analyze each option:

• Option A: Burning during welding isn't a defining trait of thermoplastics.
• Option B: PP (Polypropylene) and TPO (Thermoplastic Olefin) are types of thermoplastics. So a material with PP or TPO mark is a thermoplastic.
• Option C: Thermoplastics soften on heating, thermosets retain form. So this is incorrect.
• Option D: Powdering on grinding isn't a specific thermoplastic identifier.

Answer:

B. It has a PP or TPO mark.