Brookfield Dynamic Viscosity

Description

Determines the low-temperature fluidity of gear and hydraulic oils, ensuring reliable lubrication and easy gear shifting in severe frosts.

Winter operation of equipment places extremely harsh demands on transmission fluids. When the temperature drops far below zero, the oil thickens, and if its dynamic viscosity exceeds technical limits, it leads to oil starvation of bearings, the inability to shift gears, and massive fuel consumption to overcome the resistance of the thick lubricant. Brookfield method analysis at the RENA laboratory mathematically precisely models such severe winter conditions. This test will unmistakably show whether your oil will solidify in axles and gearboxes at temperatures from -10 °C to -40 °C. According to the ASTM D2983 method, the oil sample undergoes a strict preparation procedure. First, it is subjected to a special preheating cycle to erase its "thermal memory" and dissolve paraffin crystals. Then, the sample is slowly cooled in a special air bath or ultra-low temperature liquid cryostat to a specified sub-zero temperature (e.g., -26 °C or -40 °C) at a strictly controlled rate. Upon reaching temperature stabilization, a calibrated spindle of a rotational Brookfield viscometer is immersed in the sample. The spindle begins to rotate at a fixed speed, and the instrument's highly sensitive sensor measures the torque required to overcome the viscous friction of the cooled fluid. Based on the spindle rotation speed and the measured torque, the microprocessor calculates the low-temperature dynamic viscosity in centipoise (cP or mPa·s).