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Rat Tailing or Oxidation Crazing

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Rat tailing or oxidation crazing presents as river-like depressions, mostly linear grooves, in the casting. This defect indicates that the primary coats cracked slightly, giving access to oxygen. The reaction between oxygen and the metal follows a crack in the shell.

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