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Silicone varnishes have a ______ operation.

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Silicone varnishes have a ______ operation.

(a) Class A

(b) Class B

(c) Class F

(d) Class H

I had been asked this question in quiz.

I want to ask this question from Insulating Varnishes in chapter Magnetic & Insulating Materials of Engineering Material & Metallurgy

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Correct choice is (d) Class H

The explanation: Silicone varnishes are available as either 100% silicones or alkyd-modified silicones. The 100% silicones are operated in Class H. The Class H operations are carried out at 180^oC.

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