Slack 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.

With the continuous closure of Group I base oil plant which decrease supply, and new major applications for Slack Wax as feedstock for low sulfur fuel and Group III base oil plant, the price of Paraffin Slack Wax has since increased by a staggering 300% since early 2000s.

11 Item(s)

Set Descending Direction
Product Drop/Melting Point ℃/℉
(ASTM D87)
Oil Content Max%
(ASTM D721)
Color in Saybolt or No.
(ASTM D156)
Needle Penetration 1/10mm @25℃
(ASTM D1321)
(ASTM D1833)
Kinematic Viscocity @212℉
(ASTM D445)
Ultraviolet Absorbance
Flash Point ℃
(ASTM D92)
BSSW (L1) 70-77/158-170.6 Max 10% N/A 24 N/A 15.0-20.0 N/A Min 200
BSSW (L4) around 80/176 Max 10% Max 4 N/A N/A 15.0-20.0 N/A Min 250
SW150S 51-58/124-137 Max 20% Max 2 N/A N/A 2.5-4.5 N/A Min 180
SW500S 60-70/140-160 Max 20% Max 3 N/A N/A 6.0-9.0 N/A Min 220
SW LMO 54-58 Max 25% Max 1 N/A N/A N/A N/A Min 210
SW MMO 55-63 Max 28% Max 2 N/A N/A N/A N/A Min 230
SW SPO 48-52 Max 12% Max 1 N/A N/A N/A N/A Min 180
SW DAO 69-74 Max 20% Max 5 N/A N/A 18.50-22.50 N/A Min 240
RW 48/50 48-50 Max 12% Min 10 around 38 N/A 2-5 N/A N/A
SW150 51-58/124-137 Max 10% Max 0.5 N/A N/A 2.5-5.5 N/A Min.200
SW500 60-70/140-160 Max 13% Max 0.5 N/A N/A 6.0-9.0 N/A Min 200

11 Item(s)

Set Descending Direction