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What is the phenol level in phenolic ester in casting?

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in Casting-Forming-Welding II by (119k points)
What is the phenol level in phenolic ester in casting?

(a) Less than 2ppm

(b) Less than 3ppm

(c) Less than 4ppm

(d) Less than 5ppm

I had been asked this question by my school principal while I was bunking the class.

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

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Correct answer is (a) Less than 2ppm

Best explanation: None.

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