K10901 Oxidation Stability of Greases Test Apparatus



Test Method
The sample is oxidized in a bomb initially charged with oxygen at 110psi (758kPa) and maintained at elevated temperature for a specified aging period. The pressure drop inside the bomb is measured by means of a gauge or transducer.

Features and Benefits
• Conforms to ASTM D942 and related specifications

• Four sample testing capability

• Oxidata™ Pressure Measurement System is available with this system


K10901 Oxidation Stability of Greases Test Apparatus
Consists of Oxidation Bombs, Sample Dishes, Pressure Measuring and Recording Equipment and Oxidation Bath.

Oxidation Bomb – Stainless steel bomb consists of body, lid with stem and needle valve, and dish holder per ASTM specifications. Bomb interior surfaces and inside of stem have a high polish to facilitate cleaning. Safely withstands a working pressure of 180psi (1241kPa) at 99C (210F). Includes PTFE gasket seals (3) and cap screws with wrench. PTFE-fluorocarbon seals are available (see Accessories).

Pressure Measurement and Recording Equipment – Select mechanical pressure gauges or, for greater convenience and accuracy in test reporting, the Oxidata™ Pressure Management System designed expressly for ASTM oxidation tests.

Pressure gauge measures pressure inside Oxidation Bomb with accuracy of better than 0.5psi (3.45kPa) in accordance with ASTM specifications. Range: 0-160psi (0-1100kPa), graduated in 1psi intervals. Cleaned for oxygen service.

Oxidata™ Pressure Measurement System – A complete electronic measurement system based on powerful Oxidata™ software for Windows environments. Electronically measures and reports pressure versus time and accuracy of better than 0.5 psi (3.45kPa) in the range of 0-200psi (0-1378kPa) for four channels in graphical tabular format. Included RTD attachment permits measurement and reporting of bath temperature. Includes transducers, data acquisition card, multiplexer, Oxidata™ software, RTD probe assembly and connecting cables and hardware. Refer to K70502 for complete specifications on Oxidata™ software.

Oxidation Bath – Constant temperature oil bath holds bombs at the proper depth for determining oxidation stability of lubricating greases. Microprocessor PID control provides quick temperature stabilization without overshoot and the unit is protected by an overtemperature control circuit that interrupts power should bath temperature exceed a programmed cut-off point. Dual LED displays provide actual and setpoint temperature values in C/F format. Communications software (RS232, etc.), ramp-to-set and other enhanced features are available as extra cost options. Contact your Koehler representative for information. Heavily insulated welded stainless steel bath interior has a bomb support rack and overflow standpipe/drain to maintain proper working depth. Steel exterior has a corrosion-resistant polyurethane enamel finish.

Also available–Special baths to accommodate two test methods:
• ASTM D942 and D525 (Oxidation Stability of Gasoline–Induction Method, refer to K10400 and K10401)
• ASTM D942 and D972 (Evaporation Loss of Lubricating Greases and Oils, refer to K29300)
• Higher temperature models are available.
Please contact Koehler’s Customer Service for additional information.

Conforms to the specifications of: ASTM D942; IP 142; DIN 51808; FTM 791-3453

Oxidation Bath:
Capacity: four (4) oxidation bombs
Temperature Range: ambient to 275F (135C)
Bath Medium: 12.5 gal (47.3L) white technical oil

Electrical Requirements
115V 50/60Hz, Single Phase, 13.0A
220-240V 50/60, Single Phase, 6.8A

Dimensions dia.xh,in.(cm)
Interior: 16x14 (41x36)
Overall: 19.5x28.5 (50x72)

Shipping Information (with electronic pressure measurement system)
Shipping Weight:
Bath: 75 lbs (34.0kg)
Electronic Pressure Measurement System: 48 lbs (21.8kg)
Bath: 16.7 Cu. ft.
Electronic Pressure Measurement System: 7.8 Cu. ft.

Ordering Information



Product Description

Electrical Requirements

Oxidation Bath


Oxidation Bath

115V 50/60Hz


Oxidation Bath

220-240V 50/60Hz

Oxidation Bomb


Oxidation Bomb


Pressure Measurement and Recording Equipment
Select either Pressure Gauges or Oxidata™ Pressure Measurement System*


Pressure Gauge



4-Unit Electronic Pressure Measurement for Lubricating Grease Oxidation Tests

115V 50/60Hz


4-Unit Electronic Pressure Measurement for Lubricating Grease Oxidation Tests

220-240V 50/60Hz


*This ordering information is for installation to Koehler grease oxidation test equipment. For other makes of equipment, a few items of basic hardware may also be required. Please contact your Koehler representative for assistance.




Product Description


Pyrex™ Dish


ASTM 22F Thermometer
Range: 204 to 218F


ASTM 22C Thermometer
Range: 95 to 103C


White Technical Bath Oil


Transducer Assembly


Pressure Line. For pressurizing Oxidation Bomb.
6 ft (1.83m) long, with quick release coupling for needle valve on bomb and threaded fitting for oxygen tank.


Oxygen Manifold Pressure Relief System
Connects to oxygen source to prevent overcharging of bomb. Equipped with relief valve to vent at 125psi and 300 series stainless steel 150psi burst disk assembly. Constructed from 300 series stainless steel. Cleaned for oxygen service.


PTFE-fluorocarbon Gasket


When inquiring about NIST traceable certified thermometers, please refer to the catalog number for the corresponding thermometer and replace the middle three zeros in the catalog number with 004. Example: 251-000-01C ASTM 1C Thermometer would be 251-004-01C ASTM 1C Certified Thermometer.