Product quality
on the test rig

System Flender oil foaming test ISO 12152

Test of foaming characteristics for high-quality mineral oils

High-quality lubricating oils are used in gear wheels and worm gears; these are either mineral oils or synthetic oils depending on their area of application. The high specific loads applied to modern gearboxes set high standards for the quality of the gear oils. Suitable oil additives help to improve the scuffing, micro-pitting and pitting load capacity of the gear wheels at the tooth flank. Additives also influence the aging resistance and the foaming characteristics of oils. Excessive foaming has a negative impact on the load capacity of the gear wheels and bearings. Excessive foaming of gear oils may also cause oil leakage at the shaft seals and bleeders.

As a rule, oil manufacturers test the foaming characteristics of their oils in accordance with the ANSI / ASTM D 892 method and/or a similar method pursuant to DIN 51566, i.e. by injecting air into an oil sample over a preset time. As the results from this test frequently do not match the foaming characteristics detected in gearboxes, it was necessary to develop a test setup focusing on actual operating conditions. In the foaming test rig, a gear pair rotates in the oil to be tested and thus mixes an air-in-oil dispersion. The surface foam, the volume change of the air-in-oil dispersion as well as its reduction are tested under marginal conditions which occur in gearboxes.

Highlights and tests

  • Easy use
  • Detachable testing chamber
  • All parts easy to clean
  • All parts made of nickel-plated steel
  • Contact heating
  • Programmable oil temperature
  • Conforms to CE standards (European Community)
  • Test procedure acc. to ISO 12152
  • Characteristic values obtained: Volume of air-in-oil dispersion, temperature
  • Targeted industries: Automotive- and petroleum industry

Technical data and equipment

  • Speed standard: 1,440 rpm
  • Oil temperature: 25 °C
  • Contact heating
Contact Person
Contact Person
Matthias Schmitzer

Vertrieb FZG- und Flender-Prüfstand

Tel. +49 9421 739-551