Shell Tellus Oils
Premium Quality Hydraulic Oils
Premium quality, solvent refined, high viscosity index mineral oil based fluids
generally acknowledged to be the 'standard-setter' in the field of industrial
hydraulic and fluid power lubrication.
Applications
* Hydraulic and fluid power transmission systems
* Bearing oils
* Spindle oils
Performance Features
* Improved thermal stability
* Excellent oxidation resistance
* Outstanding anti-wear performance
* Superior filterability
* Low friction
* Good water separation
* Excellent air release and anti-foam properties
* All round versatility
Thermal Stability
Modern hydraulic systems frequently operate in extreme conditions. As reservoir capacities are
often smaller nowadays, the tendency, in some cases, is therefore to operate at higher temperatures.
In these conditions, the thermal stability of a hydraulic oil, the measure of its ability to resist
degradation and sludging at high temperatures becomes particularly significant.
The accepted test of an oil's thermal stability is to maintain it at a temperature of 135 C in the
presence of steel and copper. After seven days the weight changes in the metals are measured
and any discolouration noted, and any sludge in the oil sample is recorded.
New Shell Tellus Oils gave excellent results in this test. Weight loss in copper and steel catalysts was negligible and there was virtually
no discolouration of the copper. No sludge was found in the oil sample.
Shell Tellus Oils have been tested for oxidation resistance, using the well known Turbine Oil Stability Test (TOST). In this test the oil is
heated at 95 C in the presence of water and oxygen with copper and iron as catalysts. The time taken for the acid value to reach 2 mg
KOH/g is then measured, or the acid value measured after 1000 hours. The test results showed that Shell Tellus Oils
have an oxidation life up to four times as long as some other anti-wear hydraulic oils.
Anti-wear Performance
When designing anti-wear hydraulic oils, priority is often given to the incorporation of anti-wear
additives which become active only under severe loading conditions.
As a result, some formulations overlook the need to provide effective anti-wear performance at low load.
Shell Tellus Oils
In the case of new, however,all operating conditions have been taken into account.
Shell Tellus Oils give outstanding results in the tough 35VQ25 test for anti-wear performance at
high load. In addition, exceptionally good anti-wear performance has been recorded in the Vickers V104C vane pump test at both high and
low load. Whereas many hydraulic oils fail to meet the requirements of one or other of these
Shell Tellus Oils tests, new are shown to deliver excellent anti-wear performance regardless of operating conditions.
Filterability
As hydraulic systems are designed with ever tighter tolerances, the filterability of an oil -- its
ability to pass continuously through a fine filter -- becomes more and more important.But filterability can suffer when a hydraulic oil is
affected by common contaminants such as water and calcium. Reaction products are formed which can block the filter.
However, extensive testing has demonstrated the excellent filterability characteristics of new Shell Tellus Oils,which eliminate premature blocking of the filter by reaction products.