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APET is stable till 230°C.

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+1 vote
in Food Packaging Technology by (63.0k points)
APET is stable till 230°C.

(a) True

(b) False

I got this question in an online interview.

This key question is from Thermoforming topic in division Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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The correct answer is (b) False

Easy explanation: The given statement is false. CPET (Crystalline PET) is stable till 230°C. Whereas, APET (Amorphous PET) softens over 63°C. The CPET process is based on conventional reheat thermoforming where an extruded PET sheet containing nucleating agents to speed up and maximize crystallization is reheated to around 170°C where it softens. After this, it is transferred in a hot mold and held so the crystallinity develops. Then it is transferred to a second mould for cooling.

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