Silicone has become a popular choice for bong and pipe materials in recent years, which has led many to wonder whether or not it is safe to smoke out of a silicone bong. In short, the answer to this is: yes, it is safe to smoke out of a silicone pipe. The reason for this is that silicone can withstand temperatures of up to 520 degrees without melting, and does not emit toxic gasses when heated. 

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Source: https://americanmarijuana.org/best-weed-pipes/