Abstract: An abrasive material in a shaped form usable for grinding, abrading or cutting various articles, which has high abrasion performance and high mechanical strength and is characterized in comprising alumina fibers of 3 to 100 .mu.m in diameter and not more than 10% in coefficient of variation of diameter bonded with a resin.

Abstract: A process for producing an alumina-based fiber, which involves mixing an aluminum compound represented by the general formula AIR.sub.1 R.sub.2 R.sub.3 (wherein R.sub.1 R.sub.2 and R.sub.3 are each an organic group or a halogen) with water in a molar ratio of ([H.sub.2 O]/[AIR.sub.1 R.sub.2 R.sub.3 ]) of 1.10 to 1.40 to produce a polyaluminoxane, mixing the polyaluminoxane with at least one silicon-containing compound in an amount such that desired alumina-based fiber has, after calcining, a silica content of up to 70%, spinning the resulting mixture of polyaluminoxane and silicon-containing compound under an atmosphere controlled at a temperature of above 28.degree. C. and a relative humidity of above 35% to obtain precursor fiber, and then calcinating the precursor fiber to obtain an alumina-based fiber.

Abstract: A new process for producing an inorganic fiber of superior tensile strength and modulus of elasticity, which comprises spinning a spinning solution in organic solvent of polymetaloxane of good spinnability to form a precursor fiber, calcining said precursor fiber, and wherein said solution contains polymetaloxane comprising 0.1-95 mole % of a structural unit represented by the following general formula [A] and 99.9-5 mole % of the following formula [B]: ##STR1## (wherein, M represents a trivalent or tetravalent metal atom, X.sub.1 represents an organic group which is the same as or different from ##STR2## hydrogen, nitro or halogen, X.sub.2 and X.sub.3 represent an organic group other than ##STR3## Y represents an organic group, nitro or halogen, m represents an integer from 1 to 3.).