# Lubrication
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For the calculation of modified life, the definition of the lubrication is needed. The lubricant viscosity is calculated for the lubricant temperature using the reference values at 40°C and 100°C.
The selection ‘Consider lubrication’ defines if the modified life Lnmrh and the data for lubrication is shown in the report. For a small rotation speed, there will be no effective lubrication and the aISO factor approaches 0.1.
The lubricant cleanliness is considered by the factor eC. It can be selected if the lubricant contains effective EP additives which can have an influence on aISO factor for small speed.
The eC Factor can either be defined by lubricant cleanliness or it can be input by the user. An overview of recommended eC factors is shown in the following table:
| | | |
|------|------|------|
| **Contamination level** | **eC** |
| | Dpw < 100mm | Dpw ≥ 100mm |
| **Extreme cleanliness**
Particle size of order of lubricant film thickness, laboratory conditions | 1 | 1 |
| **High cleanliness**
Oil filtered through extremely fine filter; conditions typical for bearings greased for life and sealed | 0.8.to 0.6 | 0.9 to 0.8 |
| **Normal cleanliness**
Oil filtered through fine filter; conditions typical for bearings greased for life and shielded | 0.6 to 0.5 | 0.8 to 0.6 |
| **Slight contamination** | 0.5 to 0.3 | 0.6 to 0.4 |
| **Typical contamination**
Conditions typical of bearings without seals; course filtering; wear particles from surroundings | 0.3 to 0.1 | 0.4 to 0.2 |
| **Severe contamination**
Bearing environment heavily contaminated and bearing arrangement with inadequate sealing | 0.1 to 0 | 0.1 to 0 |
| **Very severe contamination** | 0 | 0 |