| numerical value of the Celsius temperature expressed in degrees Celsius at which the estimated time to endpoint of an insulating material is the same as the estimated time to endpoint of a control material at a temperature equal to its assessed thermal endurance
NOTE 1 – The numerical value of the assessed thermal endurance temperature is equal to the assessed thermal endurance index (ATE).
NOTE 2 – Control material is a material with known thermal endurance, preferably derived from service experience, used as a reference for comparative tests with a candidate material.
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