What is the purpose of using an asbestos liner inside a casting ring?

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To help release gases from the moldTo slow down the heating process of the investment materialTo allow for the expansion of the wax patternAll the above reasonsNone of the above

Explanation

The asbestos liner inside a casting ring primarily serves to accommodate the expansion of the wax pattern during the casting process, preventing distortion. While venting gases and controlling heating are important, the main function is to allow the wax to expand properly.