Eurosil - The European Association of Industrial Silica Producers

1.20. What is the classification and labelling of respirable crystalline silica (RCS) under the CLP Regulation?

As of 1 December 2010, suppliers will have to label and package hazardous substances according to the new CLP Regulation, which will replace the Dangerous Substances Directive in 2015.
In accordance with the new CLP Regulation, industrial minerals producers have conducted a Review and Hazard Assessment of the health effects of respirable crystalline silica (see summary) and have jointly determined it best and appropriate to classify respirable crystalline silica (respirable quartz and respirable cristobalite) as STOT RE 1 for the silicosis hazard (see sample label). STOT refers to Specific Target Organ Toxicant. RE refers to “Repeated Exposure”. Based upon scientific evidence, it is generally necessary to inhale significant quantities of RCS in an occupational setting for prolonged and repeated periods of time before any possible health effect may occur.
This classification applies to the respirable form of quartz and cristobalite (hereafter referred to as RCS) only, because it is scientifically demonstrated that it is only this fraction of crystalline silica which may cause health effects. The new CLP Regulation allows consideration of the physical form(s) or physical state(s) of substance or mixture See complete memo on the RCS classification decision.