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Home / R&R Academy / Defect Analysis / Positive Metal Defects / Burn-In



Burn-in presents as a grainy surface, often with black stains. This defect indicates that the mold and metal were overheated, causing a metal mold reaction resulting in oxides and silicates covering the mold. 

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The causes of this defect are evident in the shell and metal portions of the process. To cure these causes, R&R recommends taking the following actions.

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