Quantifying Volatility with The Lubricating Oil Evaporation Loss Tester

Quantifying Volatility with the Lubricating Oil Evaporation Loss Tester

Introduction
Evaporation of volatile components in lubricating oils can lead to viscosity changes, deposit formation, and increased oil consumption. The Lubricating Oil Evaporation Loss Tester by Changsha Friend Experimental Analysis Instrument Co., Ltd. measures an oil’s resistance to volatility by determining weight loss under standardized high‑temperature and airflow conditions.

Testing Principle
A pre‑weighed oil sample (10 g) is placed in an open crucible within a temperature‑controlled oven—commonly set at 250 °C. A calibrated, dry air flow (10 mL/min) passes over the oil surface for a specified duration (usually 60 minutes). Once the test concludes, the sample is cooled in a desiccator and re‑weighed. The percentage mass loss represents the evaporation loss, as defined by ASTM D5800.

Technical Features

• Ceramic Heating Block: Ensures uniform temperature with PID control (±0.2 °C).

• Mass‑Flow Controller: Maintains constant and repeatable airflow.

• Integrated Analytical Balance: Minimizes sample handling by weighing in situ before and after testing.

• User Interface: Touchscreen guidance for setting temperature, flow rate, and test duration; automated report generation.

Industry Applications

• Automotive Engine Oils: Screen formulations for reduced oil consumption and deposit control under severe service.

• Industrial Gear Oils: Evaluate thermal stability in high‑speed gearbox applications.

• Turbine Oils: Confirm low volatility for extended service intervals in power‑generation equipment.

• Marine Lubricants: Verify performance in enclosed, warm engine compartments.

Best Practices

1. Sample Drying: Pre‑dry oils at 105 °C for 1 hour to eliminate moisture interference.

2. Air Quality: Use oil‑ and moisture‑free compressed air to prevent contamination.

3. Residue Removal: Clean the crucible after each run to remove carbon deposits that can influence heat transfer.

4. Routine Calibration: Check balance accuracy and flow controller with calibration standards at set intervals.