What should the sulphur level in foam plastic be?(a) More than 1%(b) Between 0.5% to 1%(c) Less than 0.1%(d) Between 0.1% to 0.5%The question was posed to me in an international level competition.The origin of the question is Pattern Materials in division Pattern and Pattern Making of Casting-Forming-Welding I

What should the sulphur level in foam plastic be?(a) More than 1%(b) B

1.	What should the sulphur level in foam plastic be?(a) More than 1%(b) Between 0.5% to 1%(c) Less than 0.1%(d) Between 0.1% to 0.5%The question was posed to me in an international level competition.The origin of the question is Pattern Materials in division Pattern and Pattern Making of Casting-Forming-Welding I
Answer» The correct option is (C) Less than 0.1% BEST EXPLANATION: In foam plastic, for making pattern, the sulphur LEVEL must be below 0.1%. If the levels are HIGHER than mentioned, it can be deleterious in manufacturing.

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