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"The alloy contracts during the first 30 minutes, allowing easy removal from a mold, then expands during the next 30 minutes to return to the exact original size."
This can not be true since the environmental conditions, temperature, geometric constraints, etc. all contribute to the actual time the mold may take to return to the "exact original size" (if it actually ever does). In an attempt to convey the practicality of the material for a certain application, a totally false claim is being made, therefore, this sentence needs to be revised.
