TerraSlate and Hydronote are both considered non-flammable.  However, a material is considered "flammable" if it ignites and burns with a self-sustained flame at

a rate greater than 0.1 inches per second along its major axis - which TerraSlate and Hydronote do not.

See test results form Intertek below.

 TerraSlate & Hydronote Fire Resistance Test Results

Download the complete report here.



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