| http://www.w3.org/ns/prov#value | - Although there are a variety of synthetic and naturally occurring binder materials available such as metal oxides, clays, silicas, aluminas, silica-aluminas, silica-zirconias, silica-thorias, silica-berylias, silica-titanias, silica-alumina-thofias, silica-alumina-zirconias, mixtures these and the like, clay-type binders are preferred.
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