Food grade silicone is non-toxic, can take extreme temperatures, resists aging, and does not contain estrogen-mimicking chemicals, chemical fillers or byproducts - making it safe for use with food. Silicon, the naturally occurring chemical element that makes up silicone, is a metalloid, meaning it shares properties of both metals and non-metals. The silicone molecule is comprised of silicon, oxygen and quartz - the most common component of sand. Due to its resiliency, non-porous surface and sustainability, food grade silicone is essentially soft glass.