Multiple choice

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

  1. Calcium carbonate
  2. Zinc carbonate
  3. 5-phenyltetrazole
  4. Azodicarbonamide

  1. Only 1 and 2

  2. Only 1 and 4

  3. Only 1, 2 and 3

  4. Only 2, 3 and 4

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

Yes, it is correct., as all are used as blowing agent for polymers. 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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