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__________ is a reinforcement filler.

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__________ is a reinforcement filler.

(a) Carbon black

(b) Chinaclay

(c) Barium sulfate

(d) Chalk

The question was posed to me in final exam.

This key question is from Types of Rubbers topic in chapter Glass & Elastomers of Engineering Material & Metallurgy

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The correct choice is (a) Carbon black

The explanation is: Fillers can be classified as either reinforcing fillers or inactive fillers. Carbon black and synthetic white fibers based on silica and alumina are examples of reinforcing fillers. Talc, barium sulfate, chalk, and chinaclay are examples or inactive fillers.

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