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The differences between thermoplastic and thermosetting plastic are:  

Strength: The thermoplastic is soft and weak, whereas thermosetting plastic is usually hard and strong.

Heating effect: The thermoplastic get soften on heating and thicken on cooling. On the other hand, thermosetting plastic does not get soften on heating.

Recycle: The thermoplastic can be melted and recycled easily, but thermosetting cannot.