Rubber grinding is a tough task because of the rubber that accumulates in the grinding wheel. The friction results in excessive heat. Apart from friction wheel cuts and bad thermal conductivity also results in generation of excessive heat. Due to this the wheels crack and even break over a point of time. The problem is acute when soft rubber in ground by the vitrified wheels. It is for this reason that abrasive industry is not comfortable with grinding wheels for various applications.

The hardness of rubber is crucial for the grinding application. It is always easier to grind hard rubber. For instance ebonite has the potential to be ground quickly in a vitrified wheel though it may not be recommended due to the thermal shock created while the grinding takes place. For hard rubber with op-90 shore A, it is suggested to use a soft retinoid bonded wheel. The resin bond model grinding wheel is recommended for hard rubbers. When grinding rubber rollers manufacturers must be clear that it is not possible to determine the specification of the rubber type and its hardness, as the two may vary.

Very soft rubber can pose problem to the abrasive supplier. It is commonly used in the offset printing industry. The soft rubber is elastic and tacky making it prone to clogs while grinding the wheel at a high speed. It can result in high heat generation and other related problems. The material used includes Nitrile PVC, Chloroprene, Nitrile, EDPM, polyurethane rubber, etc. The safest way to grind the materials is resin bonded bubble alumina wheel and not vitrified wheel. The extensive porosity of the wheel allows cutting of the wheel without clogging. Because of the porosity the heat is dissipated thereby reducing the breakage and cracking.

While purchasing vitrified grinding wheels always check for speed. The maximum recommended speed is 35 m/sec.

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