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Correlation filter blockage - antifoam additive

Hallo,

I have a hydraulic system with following specifications:
- oil: Petronas Sunvis 846 WR - HV, 3000l
- max pressure 160bar

Every 2 weeks I have to change the 2 off line 3µ filter elements because of filter blockage.

We analysed the oil and the results are good. No severe contamination.

Now we analysed the filterelement and a there is a gelatinous substance with high viscosity on all the surface of the membrane
Si: 1748ppm
Ba: 425ppm
toluene insoluble: 54,74 %wt
heptane insoluble: 55,06 %wt

The oil temperature before the filter is 35°C and the tankvolume is less than 1000l when the machine is in full operation.

Is it possible that the VI improvers or antifoam additives block the filter element?

Kind regards!

Gilles
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