How to fix weight tolerance for plastic injection molded part? Does it vary with material groups?

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How to fix weight tolerance for plastic injection molded part? Does it vary with material groups?
 
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How to fix weight tolerance for plastic injection molded part? Does it vary with material groups?
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What do you mean by material group? by batch or lot number?
If you mean by material lot to lot , the variation is small. Normally we set at 3% of the part weight
 
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