Transmission oil
Density ISO 3675
Foam test ASTM D892, ASTM D6082, ISO 6247
FTIR-Infrarot Spectrum
Viscosity at 40°C and 100°C ASTM D445, DIN EN ISO 3104, DIN 51562-1
Viscosity index ASTM D2270, ISO 2909
Water content ASTM D6304, DIN 51777-1, DIN 51777-2, DIN EN ISO 12937
Total contamination
Pour Point ASTM D97, DIN ISO 3016
Flash point ASTM D92, DIN EN ISO 2592
Clenliness ISO 4406
Density
The density of oil products is measured at 15 C. The results are compared with the prescribed target values in the corresponding standard.
Foam test
General reasons for the foaming behavior of gear oil include mixing with foreign oil, contamination with grease from rolling bearings, contamination of the oil with dust, contamination of the oil with water.
In the test method, the air is pumped through a diffuser ball the oil to be tested. After switching off the air flow, the volume of the surface foam is determined in ml. After a rest period of 5 minutes, the volume of surface foam in ml is again determined. The test is carried out both at 25 C and at 95 C.
The requirement standard for gear oils, DIN 51 517 part 3, allows the following values as limit values:
- ISO VG 68 to 460 - 100 ml after switching off 10 ml after 10 minutes
- ISO VG 680 to 1500 - 150 ml after switching off 10 ml after 10 minutes
Viscosity
The viscosity is a feature of the flow rates of the oils at different temperatures. At lower temperatures (oil cold) the internal friction of the oil is high (high viscosity). At high temperatures (the poorer the oil gets), the internal friction (low viscosity) is lower. In order to enable low fuel consumption, good cold start behavior, etc., the viscosity for use in engines should be as low as possible. Otherwise, the viscosity must, however, also be as high as necessary in order to ensure sufficient stability of the lubricating film and thus the necessary wear protection.
Viscosity index
Dimensionless measurement parameter, which is determined from the kinematic viscosity at 40 C and 100 C. This parameter describes the temperature dependence of the viscosity of an oil, where higher values mean less temperature dependence.
Water contet according to Karl Fischer
Water is an undesirable component in oil products and products. High water content may indicate a defect in the engine. In addition, foaming, bacterial and fungal stress, and corrosion damage are undesirable. For quantitative determination of water by titration, the Karl Fischer method is used.
Total contamination
Liquid petroleum products - Determination of total contamination in middle distillates, diesel fuel and fatty acid methyl esters.
The total contamination is undissolved material, which is retained during filtration through a filter under test conditions.
A sample is weighed and filtered under vacuum through a previously weighed filter. The filter with the residue is washed, dried and weighed again. The contamination is calculated as the difference in the mass of the filter and expressed in mg / kg relative to the sample mass.
