Discussion
Match the following compounding ingredients in plastic technology with their respective functions:
| Compounding ingredients | Functions |
|---|---|
| P. Tricresyl phosphate | 1. Filler |
| Q. Calcium carbonate | 2. UV stabilizer |
| R. Azodicarbonamide | 3. Plasticizer |
| S. o-Hydroxybenzophenone | 4. Blowing agent |
Answer: A
The match is P-3, Q-1, R-4, S-2.
- Tricresyl phosphate is a plasticiser, used especially in PVC, where it also adds flame retardance.
- Calcium carbonate is the most common inexpensive filler.
- Azodicarbonamide decomposes on heating to release nitrogen and other gases, so it is a chemical blowing agent for foams.
- o-Hydroxybenzophenones absorb ultraviolet light and release it harmlessly as heat, so they are UV stabilisers.
The other options mismatch these well-known roles, for example making azodicarbonamide a plasticiser or calcium carbonate a blowing agent.
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