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An insulating material made from ______ is preferred for applications where vibration resistance is vital.

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An insulating material made from ______ is preferred for applications where vibration resistance is vital.

(a) Asbestos

(b) Magnesium carbonate

(c) Rock wool

(d) Cattle hair

I have been asked this question in an international level competition.

Origin of the question is Properties of Insulation in chapter Magnetic & Insulating Materials of Engineering Material & Metallurgy

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The correct option is (d) Cattle hair

To explain I would say: Sometimes cheaper alternatives are required for insulating applications. One such material is made from cattle hair and is chemically cleaned and felted. It can be used up to a temperature of 107oC and is used to withstand vibration and rough use.

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