Black gold vacuum pump oil is an ISO 41, special to this type of application|For use in any vacuum pump, black gold is extremely pure and non-detergent|Black gold is hydro processed which means it goes through a series of catalytic steps rendering the oil extremely refined, more viscous and more stable|Result is clear mineral oil which will alert to contamination sooner as it becomes cloudy or milky|In extreme temperatures, the oil will be more resistant to contaminants|Oil be changed after every evacuation for maximum performance and pump efficiency|Best test to see oil is contaminated is through a micron gauge, with a leak free system|Viscosity is a measure of the weight of the oil|For industrial oil, the viscosity is an ISO grading at 40 deg C|21 cSt at 104 deg F
JB Industries Black Gold Vacuum Pump Oil, 6 gal, Bottle, 21 cSt, Liquid, Clear to Yellow, Petroleum, Grade 15, -29 to 514 deg F, 392 deg F Flash, Flammability: 1, 0.877 Specific Gravity