For a material to be considered non-combustible, it must pass the ASTM E 136 test at what temperature?

To be classified as non-combustible, a material must undergo the ASTM E 136 test, which evaluates its ability to withstand exposure to high temperatures without igniting. The test specifically requires that the material remains stable and does not ignite at a temperature of 750 degrees Celsius. This temperature threshold is critical for ensuring that the material can be safely used in construction and other applications where fire resistance is essential. Therefore, materials that successfully pass this test at 750 degrees Celsius meet the criteria set forth for non-combustibility.