Low-Temperature Dynamic Viscosity Tester

Low-Temperature Dynamic Viscosity Tester

Cold-weather performance of engine oils depends on low-temperature viscosity. The Low-Temperature Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. simulates oil flow under sub-zero conditions following ASTM D4684 or ASTM D2983 protocols.

Samples are cooled to target temperatures (as low as –40 °C) in a refrigerated bath. A falling-ball, coaxial-cylinder, or vibrating-cup viscometer module applies shear, and dynamic viscosity is recorded. The instrument’s refrigeration unit maintains ±0.2 °C stability, while an anti-condensation enclosure prevents frost on electronics.

Developed for lubricant formulators and industry labs, it helps balance cold pumpability with wear protection. Users pre-filter samples, equilibrate at test temperature for a set dwell time, and replace bath fluid regularly to preserve thermal conductivity.

By systematically evaluating low-temperature dynamic viscosity, companies can optimize oil formulations for reliable start-up, reduced engine wear, and improved fuel efficiency in cold climates.