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The web site refractory.ratablog.com states the following, "Alumina Al2O3 refractories are the part of alumina- silica group of refractories." We noticed that the website said " They differs from fireclay refractories in term of Al2O3 content and normally have Al2O3 content of more than 45 ." It also said " The raw material base for these refractories are different than the fire clay bricks. According to the Al2O3 content, alumina refractories can be divided into. The main crystal phases of these refractories are mullite as major ph." The header had refractory as the highest ranking optimized keyword. This keyword is followed by refractory which isn't as urgent as refractory.