Slack wax is created as a by-product of the oil refining process. This material is the crude wax produced by chilling and solvent filter-pressing wax distillate. It serves as feedstock and that is further refined and blended to create value-added wax products.
There are three types of slack wax, depending on the viscosity of the lubricating oil being dewaxed: low-neutral, medium-neutral, and heavy-neutral. Each of these have different melting points. Melting points of 50-52˚C are considered light grade and 53-55˚C are heavy grade, and their oil content ranges from 5.0% to as much as 35%.
Slack waxes offer a wide variety of physical and performance characteristics including:
- A wide range of melting points
- Blended and single distillate products
- High flash points
- High n-paraffin contents
Slack Wax is derived from lubricating oils and are less refined high oil products. These high oils have relatively high oil content and processed further to produce more refined waxes. As a result, most slack waxes do not meet FDA requirements for food packaging.
Slack waxes are used in the production of a wide range of products, including wax emulsions, construction board, matches, glass wool and textile treating, synthetic firelogs, matches, inks, weed bars, carbon paper, composite wood panels, chemicals and fertilizers, paraffin wax and candles, arena footing, soil or turf protection, polishes, and fireplace products.
Applied externally, these waxes can also function as dust suppressants and/or controlled-release agents for rust protective products, and waterproofing agents in the manufacture of various industrial products.