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What is the formaldehyde level in phenolic ester in mixing?

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What is the formaldehyde level in phenolic ester in mixing?

(a) Less than 0.2 parts per million

(b) Less than 0.3 parts per million

(c) Less than 0.4 parts per million

(d) Less than 0.5 parts per million

This question was addressed to me in an interview for internship.

I need to ask this question from Cold-Set Resin Binders topic in section Binder Technology of Casting-Forming-Welding II

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Best answer
The correct answer is (d) Less than 0.5 parts per million

Explanation: None.

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