a) PVC
b) PED
c) DLC
d) GLC
Answer: c
Explanation: DLC (Diamond like Carbon) film is used for improving barrier properties of PET bottles. There is deposition of a very thin DLC film on the inner surface of PET bottle by PECVD mechanism. DLC film provides gas barrier properties, flavour barrier, UV barrier, chemical inertness, recyclability, etc.
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