Chemical Tests

Standard/                  applicable to

 Title                             Keyword/  
Meas. Unit 
 Conditions    Descriptions                                
DIN 50 017 Condensation water test Degree of corrosion  µm, h Testing of corrosion protection properties in humid atmospheres for a defined coating thickness (µm) until the first traces of rust appear (h).
DIN 50 021 Spray tests with different sodium chloride solutions Degree of corrosion h DIN 53 210
for specified coating thickness until first rust appears
Testing of corrosion protection properties in a salty atmosphere

DIN 51 802

Roller bearing greases

Testing lubricating greases for their corrosion inhibiting properties SKF EMCOR/
Corrosion grade
Three times 8 hours of operation each interrupted by 16 hour breaks at room temperature using distilled water. Testing of corrosion protection of greases when used in rolling and friction bearings. The grease is tested by adding distilled water to ball joint bearings. Then the tracks of the outer rings are checked for corrosion.

DIN 51 808

Greases

 

Determination of oxidation stability of lubrication greases, oxygen method.

 

Oxidation stability/
bar

 

100 h or 400 h, 99 °C, initial pressure 7.0 bar  Oxidation stability provides information about the behaviour of thin layers of lubrication grease, such as in rolling bearings that are subjected to atmospheric effects under static conditions over a long period of time. The test is carried out at a specified pressure for 100 for 400 hours at 99 °C. Afterwards, the drop in pressure is measured. This doesn't say anything about the shelf life of packaged grease substances. 

DIN 51 811

Rolling bearing greases

Testing of the corrosive effect of lubrication greases on copper, copper strip test method

Copper corrosion/
Corrosion grade at stated test temperature

24 h/100 °C (OKS Standard) This test is used to determine how corrosive lubricating grease is to copper. A smoothed copper strip is immersed in the lubricating grease for 24 h at a constant temperature, usually 50 °C or 100 °C. Afterwards, the corrosion grade is determined based on the discolouration. 
Aqueous substances  pH value