Klüber Klübersynth GEM 2-320


Klüber Klübersynth GEM 2-320 is a synthetic high-performance gear oil


Klübersynth GEM 2 oils,Prod. 012110, 012111,en Edition 22.08.2016 [replaces edition 14.07.2016] Benefits for your application – Synthetic high-performance gear oils – High scuffing load capacity – Very good wear protection – High micropitting resistance – Excellent rolling bearing test results – Good viscosity-temperature behaviour – Wide operating temperature range Description The Klübersynth GEM 2 oils are high-performance gear oils with a synthetic ester oil as base oil. They achieve a scuffing load capacity >= 14 in the FZG test acc. to DIN 51 354, pt. 2 (A/16,6/90), which is better than the CLP requirements. A micropitting test was performed acc. to FVA No. 54, which yielded a micropitting resistance >= 10.

The most comprehensive tests for rolling bearing lubrication were made with Klübersynth GEM 2-320. Tests with the rolling bearing lubricant tester FE 8 resulted in a rolling element wear mW50 < 2 mg and a cage wear mK50 < 20 mg (test acc. to DIN 51819-03-D-7,5/80-80, two test runs, no failure).

The oil also passed the SKF roller test (120 °C / 8 weeks). Klübersynth GEM 2 oils have a good viscosity-temperature behaviour and a wide operating temperature range. They offer good wear and corrosion protection as well as ageing and oxidation stability.

Biodegradability as shown in the CEC-L-33- A-93 test is > 70% after 21 days.




Klübersynth GEM 2 oils may be used for the lubrication of spur, bevel and worm gears as well as the associated machine elements such as sliding and rolling bearings. Furthermore, they are particularly suited for applications where leaking or dripping lubricant might pose a hazard to the environment.


Application notes


Klübersynth GEM 2 oils can be applied by immersion, immersion circulation or injection. Drip-feed lubrication and application by brush or oil feeder is also possible, as well as use in automatic lubricating systems. Basically, Klübersynth GEM 2 oils are miscible with conventional mineral oils and polyalfaolefin oils. It should be noted, however, that the oils may no longer be rapidly  biodegradable when mixed with mineral or polyalfaolefin oil. For this reason careful cleaning of the gear or the oil circulation system is advisable before switching to Klübersynth GEM 2 oils.

Ester-based synthetic lubricants may affect the functional characteristics of rubber seals, depending on the temperature and time of exposure. For permanent oil sump temperatures of max. 80 °C, NBR seals (acrylonitrile-butadiene rubber) can be used. For higher temperatures, FKM (fluoropolymers) are  suggested. It should be noted that elastomers from one or several manufacturers can behave differently. A compatibility test should always be carried out with the elastomers which are actually used.

When using Klübersynth GEM 2 oils, we recommend twocomponent paints (catalysed lacquers) for the coating. We further recommend testing the suitability of design materials and paints in contact with the selected lubricants, especially for series application.

Viscosity selection for rolling bearings and gears To select the correct oil viscosity, observe the bearing manufacturer’s instructions or refer to worksheet 3 from the Society of Tribology (GfT). For determining the correct viscosity for gears, the manufacturer’s instructions take priority in all cases. Only in cases where there are no gear manufacturer’s instructions, the viscosity can be selected in accordance with the enclosed worksheet “Klübersynth GEM 2 oils – selection of oil viscosity for gears”.


Service temperature range


Service temperatures are guide values which depend on the lubricant’s composition, the intended use and the application method. Lubricants change their consistency, apparent dynamic viscosity or viscosity depending on the mechano-dynamical loads, time, pressure and temperature. These changes in  product characteristics may affect the function of a component. For immersion lubrication of gears and chains. When using automatic systems, observe the manufacturer’s instructions regarding the maximum viscosity that can be pumped.



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