Fill in the blanks with appropriate words :
Firemen have coating of ______ plastic to make them flame resistant.

Explanation

**Step-by-Step Solution:**

1. **Understand the Question:** The question asks for a specific type of plastic that firemen use to make their gear flame resistant.

2. **Identify the Characteristics Needed:** The plastic must have properties that allow it to resist flames and heat.

3. **Recall Relevant Information:** From the study of synthetic fibers and plastics, it is known that some plastics are designed to be flame resistant.

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