a) Aluminium mold
b) Steel mold
c) Wooden mold
d) Plastic mold
Answer: b
Explanation: Steel mold is not used in thermoforming. The mould used in thermoforming should be such that the plastic polymer to be thermoformed isn’t affected by it. The mold used in thermoforming are- aluminium mold, plaster of paris mold, plastic mold and wooden mold.
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