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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 0.5ppmThis 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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Answer» RIGHT CHOICE is (d) LESS than 0.5ppm For EXPLANATION: NONE. |
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