The invention relates to a method for bonding grinding material, in particular, endless grinding belts or grinding belt segments onto a grinding element, preferably a grinding disk, or the like. Used endless grinding belts can be removed from the grinding elements only under great difficulties. However, such operations must be performed at regular intervals, as soon as the service life of the endless grinding belt has been exceeded. In particular, the removal of adhesive residues from the grinding element is a tedious task and the use of aggressive solvents is disadvantageous for the adhesive. In order to eliminate these disadvantages, the invention provides that a separating layer which is made of an unstable material with respect to solvents, is applied on at least one of the two engaging faces of an endless grinding belt and the grinding element before applying the adhesive layer. Preferably, the separating layer is mounted on the engagement face of the grinding element. As a material for the separating layer, an adhering agent, for example, a plastic resin is particularly suitable. The endless grinding belt can be bonded onto this adhering agent. Since the material used for the separating layer is easily dissolvable with a mild solvent, a used endless grinding belt can be easily removed from the grinding element, without any remaining adhesive residues.

A foamed abrasive element comprises a bond of a crosslinked and hardened unsaturated polyester resin and abrasive grains dispersed in the bond and having a porosity of 10 to 80% and a compressive modulus of 10.sup.2 to 10.sup.5 kg/cm.sup.2. A method of foamed abrasive element is also disclosed.

An abrasive wheel comprised of abrasive granules dispersed throughout and adhered in a matrix with a binder system which comprises a blend of a tough adherent binder and a smear-reducing quantity of a smear-reducing compatible polymer. An abrasive wheel having abrasive granules adhered by the binder without the compatible polymer has a tendency to smear onto the surface of a workpiece when rotated thereagainst under heat-generating conditions such as high wheel to workpiece pressure and surface speed.

The grinding media is formed of a concentration of agglomerate free hard particles exceeding 50 percent by weight of the media, wherein the particles are chelated by a dispersing agent, surface treated with a surfactant, mixed with polyether polyol and polyisocyanate plus a catalyst and water and thereafter rapidly cured in a closed mold which has been preheated to a temperature exceeding 50.degree. C. and a pressure of 60 to 120 PSIG. The water reacts during curing to create a polyurea linkage and release CO.sub.2 as a blowing agent. The resulting media has a low elastic modulus with particles retained in a polyurethane-urea binder system. The media composition may also include an inorganic filler such as glass fibers not exceeding 30 percent by weight of the media.

An abrasive structure for stone washing garments in a wash medium and a method for abrading garments using that abrasive structure to achieve controlled abrasion of those garments are disclosed. The abrasive structure has a uniform abrasive surface which will not damage or excessively wear fabrics and garments being subjected to the stone washing method, which will not deteriorate during use, and which will provide uniformly stone washed garments having a consistent nap and a low level amount of textile wear. The abrasive structure is formed of a substantially form-retaining material having a resilient abrasive surface. For example, the abrasive structure may be formed of a block of form-retaining material substantially impervious to aqueous washing systems and a resilient layer of synthetic abrasive material substantially surrounding the block and affixed to the exterior surfaces of the block.