| http://www.w3.org/ns/prov#value | - Examples of fillers which can add a lightweight characteristic and higher insulation to the molded articles include perlite, vermiculite, glass beads, hollow glass spheres, synthetic materials (e.g., porous ceramic spheres, tabular alumina, etc.), cork, pumice, and light-weight expanded clays, sand, gravel, rock, limestone, sandstone, and other geological materials.
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