Summaries and tables
The latest article
Converting of ISO purity class to NAS class - is that possible?
Year of publication: 2002, updated: 10-2024
Many machine failures are due to contamination of hydraulic oil. To assess the cleanliness of an oil, a particle count is carried out. The number of particles detected for specific particle sizes, such as 5 μm, allows the determination of the corresponding cleanliness classes.
In Europe, the cleanliness class is specified according to ISO standard 4406, while in the USA, classification according to SAE AS 4059 (formerly NAS 1638) is common. The two standards, NAS (National Aerospace Standard) and ISO (International Organization for Standardization), differ significantly in the evaluation of the measured particle counts.
- Additives for lubricants
- Alternative fuels: Types and their characteristics
- Analysis methods for greases
- Cleanliness classes for lubricants in comparison
- Converting of ISO purity class to NAS class - is that possible?
- Elements of a lubricant check
- Grease analysis
- Hydraulic fluids
- ISO purity classes of gear oils
- Limit values for lubricants
- Mixing of lubricants and additives
- Monitoring hydraulic fluids
- New lubricant, improved performance?
- OELCHECK SDA analysis service for 2-stroke diesel ship engines
- Recommended sampling intervals for trend analyses
- Stationary gas engines - Assessment and limit values
- Transformers and transformer oils
