A composite abrasive wheel with improved thermal properties is comprised of a fibrous substrate with abrasive particles adhered thereto by a crosslinked polyurethane binder comprising heterocyclic groups. The heterocyclic structures, such as isocyanurate and/or oxazolidone rings, in the binder system improve the thermal properties required for a tough, durable abrasive wheel.

This invention pertains to a composite whetstone for polishing soft metal plates, such as an aluminium disc, etc., which comprises matrix and fine abrasive particle. The matrix, uniform in structure, is composed of a polyvinyl acetal-based polymer, a hardened product of at least one kind of thermosetting plastic and amorphous silicate, the fine abrasive particle is incorporated into the matrix fixed substantially in close contact with each other in a continuous manner, wherein the superficial hardness (H) of the composite whetstone, measured by a Rockwell hardness tester with a superficial 15-Y scale, and the size (G) of the fine abrasive particle, determined by a classification procedure according to Japanese Industrial Standard (JIS) R-6001, have to satisfy the following relation.

A flexible and resilient, nonwoven, surface treating article formed of entangled synthetic fibers bonded together at points where they contact one another by a binder resin comprising plasticized vinyl resin and polymerized amine-formaldehyde derivative.

A saw comprises a support such as a metallic disc-shaped blank and a working portion bonded to the periphery of the blank. The working portion comprises a mass of abrasive particles held in a polymeric matrix and has a bonding surface through which it is bonded to the support and a working surface. Examples of suitable polymeric matrices are rubber, polyurethane and nylon.

An abrasive article, for example, a coated, bonded, or nonwoven abrasive article comprising a binder, a plurality of abrasive particles, and an antiloading component.