Foots oil or residue wax, is a by product obtained by slack wax deoiling or sweating in the paraffin wax manufacturing process. It is used in textile, leather and rubber industries, as well as petroleum jelly and white oil manufacturing.

Residue wax is the mixture of oil and slack wax. This wax, formally known as Foots oil is a commodity derived from the production of semi refined paraffin wax, having almost 60% result from 100% of slacks provided by the oil refineries.

Foots oil is used in the following products:

adhesives and sealants, anti-freeze products, coating products, fillers, putties, plasters, modelling clay, finger paints, fertilisers, fuels, non-metal-surface treatment products, inks and toners, leather treatment products, lubricants and greases, plant protection products, polishes and waxes and textile treatment products and dyes.

Other release to the environment of this substance is likely to occur from: indoor use as processing aid, outdoor use as processing aid, indoor use in close systems with minimal release (e.g. cooling liquids in refrigerators, oil-based electric heaters) and outdoor use in close systems with minimal release (e.g. hydraulic liquids in automotive suspension, lubricants in motor oil and break fluids).