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Metallic wiper | Profile | Material | Temperature | Speed |
AS | NBR 90 | -20 to +100/120 ºC | ≤1,0 m/s | |
AS | FPM 90 | -20 to +200/220 ºC | ≤1,0 m/s |
Metal-cased wipers are a single acting seal ensuring that foreign particles are not introduced into the hydraulic systems , avoiding wear and damage to all the internal components including seals. They also enable the rod to be well lubricated. Metallic wipers are single acting and can be used with combination of all rod sealing parts.
Light and medium duty construction machinery , fork-lift trucks , agricultural machinery , support cylinders and standard cylinders.
NBR90 + STEEL | |||
Media | Mineral oils (DIN 51524) | HFA and HFB | HFC |
Temperature | -30 °C to +105 °C | +5 °C to +60 °C | -30 °C to +60 °C |
Speed | ≤1,0 m/sn | ≤1,0 m/sn | ≤1,0 m/sn |
Note: For special applications that require high temperatures, metallic wipers can be supplied in FKM + steel or stainless steel.
Surface roughness | ||
| Ra | Rmax |
Dynamic surface | ≤0,4 μm | ≤3,2 μm |
Groove base | ≤1,6 μm | ≤6,3 μm |
Groove flanks | ≤3,2 μm | ≤16,0 μm |
Wiper is pressed into axially open housings. Special equipment should be used during this process. It is very important that the assembly tools must be of soft material and have no sharp edges. Before installation the wiper must be oiled with system oil.