Foaming in lubricating oils can impair fluid flow, reduce heat transfer, and degrade bearing performance. The Lubricating Oils Foaming Characteristics Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. evaluates foaming tendency and foam stability following standard procedures such as ASTM D892. Oil samples are conditioned at 24 °C and 93.5 °C in a foaming cylinder while air is sparged at a defined rate (typically 10 mL/min). Foam volumes are measured at the end of the air

Cold-cranking performance of engine oils governs startability under freezing conditions. The CCS Cold-Cranking Simulator by Changsha Friend Experimental Analysis Instrument Co., Ltd. replicates the high-shear, low-temperature viscosity behavior specified in ASTM D5293 and related protocols. In this instrument, an oil sample (usually 11 mL) is equilibrated to a sub-zero temperature (down to –40 °C) in a temperature-controlled bath. A coated viscometer rotor is immersed and subjected to a constant shear rate (10,000 s⁻¹). The resulting torque is measured via a torsion spring, and dynamic viscosity is calculated.

Automatic Open Cup Flash Point Tester Flash point is a critical safety parameter for flammable liquids. The Automatic Open Cup Flash Point Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. automates the open-cup method to determine the lowest temperature at which vapors ignite in ambient air.

Wear control is fundamental to extending machinery life and reducing operational downtime. The Lubricant Anti-Wear Performance Tester from Changsha Friend Experimental Analysis Instrument Co., Ltd. assesses the protective properties of oils and additives under boundary and mixed lubrication regimes.

Evaporative loss of lubricant under high-temperature conditions leads to viscosity shifts, deposit formation, and reduced lubrication efficiency. The Lubricating Oil Evaporation Loss Tester offered by Changsha Friend Experimental Analysis Instrument Co., Ltd. measures the volatility of oils by simulating engine or gearbox thermal environments and quantifying weight loss. The tester heats a precisely weighed oil sample (usually 10 g) in an open or semi-sealed chamber at a standard temperature (commonly 250 °C) while a regulated flow of dry air passes over the surface. Over a set duration (typically 60 minutes), volatile fractions evaporate and are carried away. Before and after weights determine the percentage mass loss, indicating the oil’s resistance to volatility.