Lubricating Oil Evaporation Loss Tester Factory

Lubricating Oil Evaporation Loss Tester

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.

Engineered for repeatability, the instrument features a ceramic heating block with PID temperature control (±0.2 °C), a mass-flow controller to maintain air flow at 10 mL/min, and a high-precision analytical balance integrated directly beneath the test chamber. A touchscreen interface guides operators through test setup, and data logging software exports results for trend analysis.

This tester finds use in automotive engine oil development, industrial gearbox lubricant certification, and marine oil quality assurance. Formulators rely on evaporation-loss data to select base oil blends and additive packages that minimize oil consumption and deposit risk. Quality labs verify batch conformity before market release.

To achieve consistent results, samples must be free of entrained air and moisture; pre-conditioning at 105 °C for 1 hour is recommended. The air supply should be filtered and dried. Regular chamber cleaning removes carbonized residues that could affect heat transfer. By incorporating evaporation loss testing, organizations can ensure long-term lubricant performance and engine cleanliness under severe operational conditions.