So, is fire glass flammable?
No, fire glass is not flammable. Fire glass is glass that has been specially tempered to withstand high heat for prolonged periods of time. Authentic fire glass comes with a heat rating, such as 1400 degrees Fahrenheit. This rating is well above the heat any normal backyard outdoor fire pit or indoor gas fireplace would produce.
Not all glass is fire glass!
The meticulous tempering process fire glass undergoes before it is certified makes it safe to use in a fire. Miniscule air bubbles have been drawn out and removed during the multi-step heat-proofing process. These air bubbles are found in most types of glass, and are virtually invisible.
But Doesn’t Fire Glass Burn when Lit?
While it may appear that fire glass is burning, it actually isn’t. Similar to a gas stove, what is actually alight is simply the gas itself. The burning gas causes flames to dance around and above the fire glass.
Even though fire glass doesn’t burn, it does retain heat and refract light from the flame. Because fire glass crystals do radiate heat, they serve a dual purpose: keeping things warm and looking great while doing it.