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If a plastic film has high OTR, it will have a high WVTR too.

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+1 vote
in Food Packaging Technology by (63.0k points)
If a plastic film has high OTR, it will have a high WVTR too.

(a) True

(b) False

I have been asked this question in an online interview.

This is a very interesting question from Diffusivity and Permeability in Plastics topic in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Correct option is (b) False

Easiest explanation: The given statement is false. There are many plastics which act as a good water vapour barrier and a poor gas barrier. It is because of different Water Vapour Transmission and Oxygen Transmission rates. For example, EVOH has low Oxygen Transmission Rate but higher Water Vapour Transmission Rate.

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