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The purpose is to assess the degree of contamination or loss of quality (heat and chemical) of the oil.
Insoluble residue = soot, dust, metal fragments (due to abrasion), products of oxidation and hydrolysis …
Determined by the following methods:
Total insoluble residue: Number of mg of residue collected after filtering 100ml of oil
=> Used for industrial oil
0.8 μm filter: Hydraulic oil.
1.2 μm filter: High viscosity hydraulic oil.
5 μm filter: Gear oil.