Vermiculite, Fine, Light Weight, Refractory, FreeShip.
$5.96
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Vermiculite is extremely light weight, inexpensive, very absorbent, and can withstand high temperatures (useful for a refractory material and a fireproofing one and a high temperature insulating material). It's a natural product made from a mica-like mineral by heating, during which it expands greatly in volume. The mineral it's made from has a water bearing laminar structure (flat sheets like mica) which "exfoliates" when heated. The mineral has a really long name: "hydrated magnesium aluminum iron silicate"....(see more)
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