Smooth oil code and its significance

According to GB/T7631. 1 - 1987 rules, smooth oil code consists of categories, types and number, the pattern of its writing category + type + number. Category refers to the classification of petroleum products, smooth agent is one of the oil products, smooth information products with L said. Type refers to the grouping, smooth oil is grouped according to their application places respectively with corresponding letters represent: A - — Total loss system; C— — Gear; D— — The tightening machine; E— — The internal combustion engine; F— — The stator, bearings, clutch; G— — Guide roller; H— — The hydraulic system; M— — Metal processing; P— — The wind open tools; T— — Steam turbine; Z— — Steam cylinder, etc. , is the first letter type column, practice type column may also have one or more other letters, to say the kinds of varieties of further subdivided. Numbers represent smooth oil viscosity grade, its value is equivalent to 40 ℃ ( Some are batch number, but please indicate, otherwise refers to 40 ℃) Yes middle kinematic viscosity value, the unit is was/s, according to GB/T3141 - 1994 rules 2, 3, 5, 7, 10, 15, 22, 32, 46, 68, 100, 150, 220, 320, 460, 680, 1000, 1500, 2200, 3200, a total of 20 levels. Example: L - — AN100, said viscosity grade of 100 was smooth oil/s total loss of the system, its kinematic viscosity in 40 ℃ is 90 ~ 110 was/s, kinematic viscosity of the middle class of 100 was a/s.