bright stock slack wax
In the process of producing lubricants and/or base oils the byproduct of this process called Slack Wax. Slack waxes are mixture of oil and wax and depend on the origin of the material it may contain up to 40% oil content. Slack Wax are waxes, materials which have changing properties such as having solid state at room temperature while liquefying at higher temperatures. Slack Wax from different refinery has different properties, and the important specifications are color, oil content and drop melting point.