Hydraulic oil viscosity chart8/2/2023 ![]() ![]() This is the reason why they do not mix with each other. polyglycolether / borate ester - DOT 3, DOT 4 types, DOT 5.1 types (the main difference between these three types is - simply put - a different ratio of glycol and borate ester and the amount of additives) Generally, optimum operating viscosity of the hydraulic oil should be between 16 cSt (80 SUS) and 40 cSt (180 SUS).It may be used for designing limiting flow orifices in hydraulic systems. There are three main types of brake fluids which are classified by their different chemical base: Hydraulic Oil Flow through Orifices The chart shows approximate pressure drops which may be expected at various flows rates through sharp edge orifices for petroleum type hydraulic oil. Most producers also state values at + 40 ☌ and give the viscosity index. Therefore, these liquids must fulfill specifications mainly at -40 ☌ and +100 ☌, liquids used for military purposes at -55 ☌ and + 100 ☌. ISO VG 46 is the most popular grade due to its middle grade flow properties with a thickness that is equivalent to a SAE 15 weight lubricant. This is the thickness of the fluid tested at 40 degrees Celsius. ![]() Viscosity is an essential parameter for the safety of a road vehicle as it directly influences the operation and behavior of the brake system and/or the clutch. AW 46 hydraulic fluids have an International Standards Viscosity Grade or ISO VG of 46. Brake fluids used in hydraulically operated clutches transmit the pressure applied on the master cylinder to the slave cylinder of the clutch system. They transmit the pressure applied on the master brake cylinder via the brake pedal to the wheel brake cylinders of road vehicles. Automotive brake fluids are mainly used in the brake and clutch systems of road vehicles. ![]()
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