Bright Stock 150 (BS150)

Bright stock 150 specifications, uses and supply for blenders

Bright stock 150 is the heaviest standard base oil. Refiners make it by deasphalting vacuum residue and solvent refining the result, so it comes from Group I plants. Typical bright stock 150 specifications from ExxonMobil's AP/E Core product data sheet for Core 2500 are: kinematic viscosity at 100 °C 30.6-32.7 cSt, viscosity index 95 minimum, flash point 294 °C, pour point -6 °C and ASTM colour 6 maximum. The same company's cargo handling sheet for Core 2500 gives a density of about 900 kg/m3 at 15 °C and a brown appearance. The dark colour is normal. It comes from the heavy fraction that gives the oil its viscosity.

Blenders use bright stock where neutrals run out of viscosity: heavy-duty diesel and SAE 40, 50 and 60 engine oils, industrial and automotive gear oils, marine cylinder and system oils, and grease base fluid. Supply is tight because Group I plants keep closing. Argus reported in December 2024 that European Group I capacity fell 55% in a decade to about 4 million t/yr, with Eni's 600,000 t/yr Livorno unit shut in 2024, and that bright stock had no direct alternative, although one refiner planned a high-viscosity Group II substitute. CBIL is a commodity brokerage company and brokers bright stock from refineries in South Korea, Singapore, the USA, Spain, Germany, Saudi Arabia (Red Sea side), India, Taiwan and Thailand, and from UAE blending hubs. Each lot ships against the refinery COA and SGS or Intertek inspection at load, in bulk parcels, ISO tanks, flexitanks of about 20-22 t or new steel drums of 180-210 kg. Send the grade, quantity, packing, destination port and payment terms.

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Excluded origins are not offered, including product re-exported, blended or re-processed through a third country. Every lot moves with a certificate of origin naming the producing plant, mine or grower country, and nothing is quoted before the seller and loading point are known.