DA
Description
DA rotary shaft oil seal profiles feature two opposite facing spring loaded elastomer lips with metal case for general bi-directional fluid sealing, fluid separation or contamination exclusion. A stainless steel garter spring provides constant, uniform load of the each elastomer lip on the shaft for the life of the seal. The spring keeps the elastomer lip in contact with the shaft during higher shaft speeds and also helps offset normally occurring compression set and wear of the lip material.
* High resistance to gap extrusion.
* Particularly strong wear resistance.
* Insensitivity to shock loads and pressure peaks.
Application
For use in general pressure applications requiring bi-directional fluid separation or contamination exclusion.
Materials
Fluorinated Rubber (FKM) + Nitrile Rubber (NBR)
TECHNICAL DATA
TECHNICAL DATA
| Temperature | NBR: Temp -20F / +250F FKM: Temp -40F / +400F |
| Pressure | 0 to 7 psi |
| Speed | 10.2 m/s |
| Medias | Mineral hydraulic oils |
MATERIALS
MATERIALS
FKM
Depending on their structure and fluorine content, the chemical resistance and resistance to the cold in fluororubbers can vary. This FKM-based rubber is very often used for high-temperature hydraulics and pneumatics, for industrial valves, injection/fuel systems, motor seals and high-vacuum systems.
| Chemical resistance | Mineral oils and greases, ASTM n°1, IRM 902 and IRM 903 oils. Fire-resistant liquids (HFD) Silicone oils and greases Mineral and vegetable oils and greases Aliphatic hydrocarbons (propane, butane, petroleum) Aromatic hydrocarbons (benzene, toluene) Chlorinated hydrocarbons (trichlorethylene) Fuel (including high alcohol content) Atmospheric and ozone agents |
|---|---|
| Compatibility issue | Glycol-based brake fluids. Ammonia gas. Organic acids with a low molecular weight (formic and acetic acids) |
| Temperature range | -20°C / +200°C (short-term peak at +230°C) -40°C / +200°C with particular FKMs |
NBR
Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.
| Chemical resistance | Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel) Mineral oils and greases Fire-resistant fluids (HFA, HFB and HFC) Diluted acids, low-temperature alkaline and saline solutions Water (up to +100°C max) |
|---|---|
| Compatibility issue | Fuels with high aromatic content Aromatic hydrocarbons (benzene) Chlorinated hydrocarbons (trichlorethylene) Polar solvents (ketone, acetone, acetic acid, ethylene-ester) Strong acids Glycol-based brake fluids Atmospheric and ozone agents |
| Temperature range | -30°C / +100°C (short-term peak at +120°C) -40°C / +100°C with particular NBRs |