Question

    The plastic material commonly used for making gear

    wheels is –
    A Polyesters Correct Answer Incorrect Answer
    B Nylons Correct Answer Incorrect Answer
    C Bakelite Correct Answer Incorrect Answer
    D Polystyrene Correct Answer Incorrect Answer

    Solution

    Popular materials for plastic gears are acetal resins such as DELRIN, Duracon M90; nylon resins such as ZYTEL, NYLATRON, MC901 and acetal copolymers suchas CELCON.The physical and mechanical properties of these materials vary with regard to strength, rigidity, dimensional stability, lubrication requirements, moisture absorption, etc.

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