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word:     Borosilicate

Borosilicate is a type of glass that can tolerate shifts in temperature, making it perfect for building pipes. Because borosilicate doesn't expand as much as other glass types when heated, there's a very low risk of joints or accessories cracking when a flame is applied. All GRAV® glass is borosilicate with the exception of quartz nails and bangers.
Tags : Glass Style

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