Multiple choice

Which of the following compounding ingredients are used as blowing agents for polymers?

  1. Calcium carbonate
  2. Zinc carbonate
  3. 5-phenyltetrazole
  4. Azodicarbonamide Select the correct answer using codes given below:

  1. 1 and 2

  2. 1 and 4

  3. 1, 2 and 3

  4. 2, 3 and 4

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Zinc carbonate is an inorganic chemical blowing agent which decomposes at higher temperature than bicarbonates. 5-phenyltetrazole (5-PT) has been widely used as a blowing agent for foaming high temperature-processing polymers. The principal use of azodicarbonamide is in the production of foamed plastics as a blowing agent.

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