Polyethylene (PE) Wax is manufactured as first intention product or as by-product from polyethylene synthesis using catalytic polymerisation, most commonly utilising the Ziegler-Natta catalyst. PE wax can also be produced as a result of controlled thermal degradation of polyethylene. In general polyethylene waxes have higher molecular weights and more branched hydrocarbons than Fischer-Tropsch waxes, which yield products with higher melt melting points, higher melt flow viscosities and similar hardness. It is possible to functionalise polyethylene wax through oxidation or reactive grafting to enhance the properties of the waxes, specifically regarding free-surface energy and viscosity. The waxes are commonly used in polymer processing, due to their compatibility with polymers, and production of dispersions and emulsions. Certain grades are certified for food contact in specific applications.