Chlorinated paraffins are chemicals manufactured by chlorination of liquid n-paraffin or paraffin wax. The largest application for chlorinated paraffins is as a plasticiser and flame-retardant in flexible PVC. They are also used as plasticisers in paint, sealants and adhesives. Higher chlorine content grades are used as flame-retardants in a wide range of rubbers and polymer systems. Another major outlet for chlorinated paraffins is in the formulation of metalworking lubricants where they have long been recognised as one of the most effective additives for lubricants used in a wide range of machining and engineering operations. Finally, they are used in leather formulations.

Chlorinated paraffins (CPs) are chlorinated derivatives of n-alkanes, having carbon chain lengths ranging from 10 to 38, and a chlorine content ranging from about 30 to 70% (by weight). The melting point of CPs increases with increasing carbon chain length and with increasing chlorine content. It has also been found that toxicity or environmental effects can vary depending on the chain length.

Highly complex, stable compounds containing chlorides that are resistant to degradation and oxidation. Used as softeners in plastics and rubber, as flame retardants and as components of cutting fluids in metalworking. Harmful primarily to aquatic life.