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Instead of melting back, the sprue simply falls over. What is the problem?

falls melting problem sprue
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Instead of melting back, the sprue simply falls over. What is the problem?

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In your sprue-type operation, one likely cause is contaminated zinc alloy. Have a sample of the alloy from the melt pot analysed for iron content. If iron is present, clean out the melt pot and put in new alloy.

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