Remember: In fluid power, a 26-micron particle moving at 10 m/s carries the kinetic energy of a small bullet. Stop it with an FM26 ISO-rated filter, or let it destroy your servo-valves. The choice is clear.
| Rating | Micron Size | Efficiency | Common Application | |--------|-------------|------------|---------------------| | | 26µm absolute | 99.5% (ß26≥200) | Servo-valve protection, marine lube oil | | ISO 4406 18/16/13 | N/A (cleanliness code) | N/A | General industrial hydraulics | | NAS 1638 Class 8 | 5-15µm nominal | ~75% | Aerospace (legacy) | | FM10 ISO | 10µm absolute | 99.9% | Ultra-clean circuits (Eaton/Vickers) | | FM60 ISO | 60µm absolute | 98% | Suction strainers, coolant systems | fm26 iso