SLACK WAX
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Slack Wax
Yellow to dark-colored crude paraffin wax that is separated from the part of the oil in paraffin distillate by chilling and pressing or by use of a solvent and that contains considerable residual oil compare scale wax.
Slack Wax is mixture of paraffin wax and oil originated from petroleum crude oil. Slack Wax oil content can range from 10% to 30%.
Slack Wax is produced during the production of Group I lube base oil. During production of Group I lube base oil, the feedstock firstly has to go through solvent extraction process to remove aromatics and the resultant product is called raffinate. The raffinate is then diluted with solvent like methyl-ethyl ketone (MEK) to lower its viscosity to improve low-temperature filterability. The diluted oil is then chilled to -10°C to -20°C. Wax crystals will form, precipitate and removed by filtration. The removed wax becomes Slack Wax.
The traditional usage of Paraffin Slack Wax is in the production of fully refined paraffin wax. And other major usage are for particle board and medium density fiberboard, cable filing compound , matches, candles, rust protective products and moisture vapor barriers.
Slack wax is a mixture of oil and wax, a byproduct from the refining of lubricating oil.
Sepahan Slack Wax is available in two major types: Light and Heavy Slack Wax
Slack Wax (Heavy / Medium and Light) specification
| Test method ASTM | SW | SW | SW | Characteristic |
| D-445 | 8 | 7 | 5 | Kinematic viscosity @ 100 °C , cst |
| D-92 | 265 | 250 | 230 | Flash point, °C |
| D-1298 | 855 | 840 | 820 | Specific gravity @ 15.6°C/15.6°C |
| D-721 | 25 | 20 | 15 | Oil content , wt% |
| D-937 | 26 | 60 | 55 | Congealing point , °C |
| D-1500 | 2.0 | 1.0 | 0.5 | Color |
| D-127 | 65 | 60 | 57 | Drop melting point, °C |