制动液介绍备驰要求沸点下降确保安全由于吸水极.pdf

Requirements of brake fliuds Minimal drop of boiling point due to wa bsorption High boiling points for safety (relevant property: Wet boiling point) under extreme conditions Brake fluid is hygroscopic (wa bsorbing),regular Optimum corrosion change is mended protection of the system (see service ) Avoid contact with Optimum lubrication lacquer/paints (soluble) of the system Compatible with all materials (metals, rubber, elastomers) Brake fluid Base fluid consisting of different combinations of : - Polyglycol ethers - Borate esters - Polyglycols + Additives: - Surface protection - Product protection = Brake fluid Minimum requirements for brake fluids The United States Department of Transportation (DOT) describes the standard minimum requirements for Brake fluids into three classes (DOT 3, DOT 4, DOT 5). DOT 5 is further distinguished in DOT 5 silicone base and DOT 5.1 non-silicone-based (glycol) Parameter DOT 3 DOT 4 DOT 5 Boiling point [°C] ≥ 205 ≥ 230 ≥ 260 Wet boiling point [°C] ≥ 140 ≥ 155 ≥ 180 ² Viscosity −40°C [mm /s] ≤ 1500