Slack Wax

Crude wax, also called petroleum wax or slack wax, is an unrefined mixture of high-melting hydrocarbons, mainly of the normal straight-chain type, still containing a fairly high percentage of oil. It is obtained by filtration (as such or after addition of a solvent) from high boiling distillates or residual oils. It is obtained by filtration (as such or after addition of a solvent) from high boiling distillates or residual oils slack wax is primarily obtained as by-product in the manufacture of lubricating oils.