Posted By ROY DUDLEY Hi James, Health studies have shown increased risk of Cancer in workers exposed to rubber fume. Supported by possible formation of nitrosamines and polycyclic aromatic hydrocarbons which may be present in certain extender oils. Guidance is available in Rubber Industry Advisory committee (RUBIAC) publication "Dust and fume control in rubber mixing and milling" ISBN 0717609928 Alternative support / guidance can be obtained from British Rubber Manufactures Association (BRMA). Regards Roy

Posted By david baird James, Used to work in rubber industry and had the exact same question asked by my then boss. (In a hope to evade the LEV being installed, more than anything else) Does appear from the literature that the higher the oil content, and the greater the likely hood of nitrosamines being formed, then the greater the carcinogenic properties - apparently. However, like many things regarding exposure to hazards, evidence was not totally conclusive so I backed off going into detail. Went for the de-fault position of rubber fumes in general are strongly suspected carcinogen. Best of Luck David