| http://www.w3.org/ns/prov#value | - alc, diatomaceous earth and vermiculite; synthetic and natural zeolites; portland cement; precipitated metal silicates, such a calcium silicate and aluminum polysilicate; alumina silica gels; glass particles, including microbeads, microspheres, flakes and fibers; and salts, such as molybdenum disulfide, zinc sulfide and barium sulfate.
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