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Synthetic mineral fibre (SMF) is a generic term referring to fibrous inorganic substances made primarily from rock, clay, slag or glass. These fibres can be classified into three general groups: glasswool (fibreglass, superfine glass fibre and glass filament); mineral wool (rockwool or slagwool); and ceramic fibres.

These products are used extensively in the manufacturing industry, commercial buildings and residential properties as thermal and acoustic insulation materials.

Working with SMF can cause skin irritation, particularly where there is rubbing from clothing such as cuffs and collars. If SMF accidentally comes into contact with eyes, severe irritation may result. Airborne fibres can be inhaled, depositing in the nose and mouth and causing upper respiratory tract irritation (tickling and dryness in the nose and throat).

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