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Q.

Which of the following is used as a lubricant in the moulding powder from urea-formaldehyde resin?

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a

ammonium sulphamate

b

trimethyl phosphate

c

mohrs salt

d

zinc stearate

answer is A.

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Detailed Solution

Metal stearate like zinc stearate, aluminium stearate, etc. (quantity about 1%) is used as a lubricant in the moulding powder.

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