Fully synthetic EP industrial gear oils based on special, selected polyglycols (PAG)
DescriptionThe RENOLIN PG oils are fully synthetic industrial gear oils based on special, newly developed polyglycol base oils. Thus the RENOLIN PG products offer a very high oxidation and temperature stability. Polyglycols have a very good viscosity temperature-behaviour (high natural, shear-stable VI) and can therefore be used within a widetemperature range (depending on the viscosity grade and the working conditions from–35°C up to 160°C). Special additives adapted to these polyglycols further improve the good properties of the base oils – high wear protection, excellent corrosion protection also at the presence of condensation water, low foaming, very good compatibility with non-ferrous metals. The excellent anti-wear properties could be proven in different tests with RENOLIN PG. The load stage >14 was passed in the standard FZG test (FZGA/8,3/90), and the load stage >12 was passed in the FZG test A/16,6/140 (high speed, high temperature FZG test). RENOLIN PG has a high micropitting resistance - load stage “high” - and a good pitting resistance. RENOLIN PG was tested in a special “low speed” FZG test (according to DGMK Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V.) – FZG scuffing test) which RENOLIN PG passed with excellent results (wear category: “low” = excellent). This special test shows the excellent wear protection of RENOLIN PG at two different temperatures (90°C and 120°C) under mixed and boundary lubrication conditions. The lubricating film remains stable even at high pressures and under mixed friction conditions. Thus ,the friction coefficient is low, and a temperature reduction by up to 20°C can be achieved compared with mineral oil-based lubricants. Efficiency tests in a worm gear test rig demonstrated the high performance and the low friction coefficient which is especially of great importance for the use in worm gears. The results of RENOLIN PG in the FE8 roller bearing wear test were excellent. Tests in a special test rig at the University of Munich (FZG Institute – Forschungsstelle für Zahnräder und Getriebebau) led to excellent results regarding antiwear behaviour and efficiency.
ApplicationThe RENOLIN PG gear oils are mainly suitable for the lubrication of gear units and worm gears / roller bearings and friction bearings which are subject to high mechanical and thermal stress. Especially in applications with high sliding velocities (e.g. worm gear units) the RENOLIN PG oils offer advantages compared with mineral oil-based gear oils. Due to the high oxidation stability, the oil change intervals can be extended and the maintenance costs can be reduced also at higher operating temperatures. The use of RENOLIN PG in worm gears (steel-bronze pairing) leads to a significant reduction of friction and wear.