Auto Lubricating Oil HTHS Dynamic Viscosity Tester

Auto Lubricating Oil HTHS Dynamic Viscosity Tester

High-Temperature High-Shear (HTHS) viscosity governs oil film thickness under engine conditions. The Auto Lubricating Oil HTHS Dynamic Viscosity Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. measures viscosity at 150 °C and shear rates of 1,000 s⁻¹ to 1,000,000 s⁻¹ following ASTM D4683.

The instrument features a capillary viscometer housed in a temperature-controlled oven (±0.1 °C). A piston or spinning rotor applies controlled shear, and back-pressure sensors record resistance. Software calculates HTHS viscosity, a key parameter for engine wear protection and fuel economy.

Designed for R&D and QC labs, it includes automated sample loading, real-time shear-rate control, and an anti-vapour jacket to prevent thermal degradation. Users rely on HTHS data to balance low-temperature pumpability with high-temperature film strength.

Best practices include filtering samples through 2 µm filters, equilibrating at test temperature for 30 minutes, and performing periodic capillary calibration with standard oils. Incorporating HTHS testing ensures oils maintain protective films under extreme engine shear conditions.