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What does “Class A” mean when talking about Fire retardant Specifications?

April 26, 2017class a mean retardant specifications talking

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What does “Class A” mean when talking about Fire retardant Specifications?

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In regards to the surface burning standard ASTM E84, this test calculates two numbers. One is “Flame Spread Index”, and the other is “Smoke Developed Index”. These numbers determine whether the material is “Class A”, “Class B”, or “Class C” (or Class 1, Class 2 or Class 3, respectively). Class A represents that the material will not burn or smoke much, and Class C represents that the material will burn heavily and produce even more smoke. Class B will burn a little more than Class A, and also produce slightly more smoke than in Class A.