Glass is an inorganic material that has been melted at high temperature (above 800 ℃, daily glass is generally melted at 1100 ℃.), and will not undergo chemical changes below the softening point temperature. Above the softening point temperature, it will only soften, melt or decompose without burning.

Glass fiber cloth draws glass into very fine glass fiber, which has good flexibility at this time. The glass fiber can be spun into yarn and then woven into glass fiber cloth by weaving machine. Due to the extremely fine glass fiber and the large positive surface per unit mass, the temperature resistance has decreased. Just like a candle can melt a thin copper wire.