| http://www.w3.org/ns/prov#value | - Before or after crosslinking, or during crosslinking (particularly during melt-kneading), there may be added, if necessary, fillers such as carbon black, calcium carbonate, silica, metallic fibers and carbon fibers, as well as additives such as antioxidant, flame retardant and coloring agent, and paraffinic, naphthenic or aromatic mineral oils for assisting the dispersion of the fillers and enhanc
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