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What is the formaldehyde level in phenolic ester in casting?

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

(a) Less than 0.2ppm

(b) Less than 0.3ppm

(c) Less than 0.4ppm

(d) Less than 0.5ppm

This question was posed to me in a national level competition.

This interesting question is from Cold-Set Resin Binders in section Binder Technology of Casting-Forming-Welding II

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Right choice is (d) Less than 0.5ppm

For explanation: None.

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