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Neminath Instruments

Oxidation Stability of Lubricating Grease ASTM D942

ASTM D942 oxidation stability test measures grease resistance to oxidation by monitoring pressure drop in oxygen over time, indicating grease life and stability.

Oxidation Stability of Lubricating Grease ASTM D942

Compliance Standards : ASTM D942 – Standard Test Method for Oxidation Stability of Lubricating Greases by the Oxygen Pressure Vessel Method , Equivalent methods as specified by lubricant and grease manufacturers
Application : The Oxidation Stability of  Lubricating Grease Apparatus is used to determine the resistance of lubricating greases to oxidation under accelerated conditions. The test measures the drop in oxygen pressure within a sealed pressure vessel containing grease samples at elevated temperature. It is widely used in petroleum laboratories, grease manufacturing units, R&D centers, and quality control laboratories to evaluate grease performance and shelf life.

Product Description The apparatus consists of a robust oxidation pressure vessel housed inside a transparent, heat-resistant oil bath. The system operates at a controlled temperature while oxygen pressure is applied to the test vessel containing grease samples in individual sample cups. Dual precision pressure gauges monitor oxygen pressure during the test period. The unit is equipped with a digital temperature controller, safety pressure relief arrangement, and sturdy clamping mechanism to ensure safe and reliable operation. The transparent bath allows continuous visual monitoring of the test. The apparatus is designed for accurate, repeatable results in full compliance with ASTM D942 requirements.

Technical Specifications

Test Method:

Oxygen pressure drop measurement

Standard:

ASTM D942

Operating Temperature:

99 ± 0.5 °C

Initial Oxygen Pressure:

110 psi (approx. 758 kPa)

Pressure Measurement:

Dual analog pressure gauges

Temperature Control:

Digital PID temperature controller

Heating Medium:

Oil bath

Sample Capacity:

As per ASTM D942 (multiple grease cups)

Power Supply:

230 V AC, 50 Hz, Single Phase

Safety Features:

Pressure relief valve, emergency stop, over-temperature protection

Apparatus Supplied

  • Oxidation pressure vessel assembly
  • Transparent oil bath with heater
  • Dual pressure gauges with fittings
  • Grease sample cups as per ASTM D942
  • Digital temperature controller with sensors
  • Oxygen inlet and vent valves
  • Safety pressure relief system
  • Operating instruction manual

Optional Accessories

  • Additional grease sample cups
  • High-accuracy digital pressure transducer (optional upgrade)
  • Oxygen cylinder with regulator
  • Calibration certificate (traceable to national standards)
  • Spare gasket and seal kit
  • Data logging system (temperature & pressure)

Dimensions and Weight (Approx.)

Overall Dimensions (W × D × H):

450 × 400 × 550 mm

Weight:

30–35 kg

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