Is respirable crystalline silica the same as crystalline silica (fine fraction)?

The term Respirable Crystalline Silica relates to airborne dust in workplace atmospheres.

The term Crystalline Silica (Fine Fraction) relates to fine particles present within bulk products. It is used to help define products' classification and labelling. In accordance with the CLP Regulation, industrial minerals producers have jointly determined it appropriate to classify crystalline silica (fine fraction) (quartz (fine fraction) and cristobalite (fine fraction)) as STOT RE 1 for the silicosis hazard. See chapter 'classification and labelling'.

Fine fraction particles contained within products may become airborne during handling and use, in which case they may become respirable particles.

The fine fraction of crystalline silica is the relevant fraction which can potentially reach the deep lung, as defined by EN 481.

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