prov:value
| - The matrix materials may be inorganic or organic in nature and may include by way of illustration: cement, concrete, sintered fly ash or bottom ash/phosphoric acid mixtures, ceramics including, for example, silicon oxide, titanium oxide, silicon nitrite, graphite, carbon, and metals such as aluminum, steel or other metal alloys, asphalt, thermoplastic polymers, thermosetting polymers, thermoplasti
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