a) 5-25 mNm-1
b) 29-45 mNm-1
c) 45-55 mNm-1
d) 10-25 mNm-1
Answer: b
Explanation: Polymers used for packaging films must have a surface energy- 29-45 mNm-1. The standard is set by ASTM. Also, the surface energy of the substrate should be 7-10 mNm-1 higher than the surface tension of coating being applied.
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