STA156-025-033-006/1 is a compact seal that works as single acting and can be used in rod applications. The material used on this compact seal is made of NBR/NBR-FABRIC/POM 80 shore. The maximum allowed pressure is 400 BAR.
The dimensions has an inner diameter of 25 mm, an outer diameter of 33 mm and a height of 6.4 mm.
About the sealing profile STA156
STA156 Rod seals are made up of NBR impregnated on NBR-fabric. They are especially designed for rod applications. The POM back-up ring provides a high rate of flow resistance. STA156 Seals with inner dimension shorter than 40 mm are recommended to be used accompanied by an open housing seal.
About the material NBR/NBR-FABRIC/POM
Nitrile is a widely used nitrile butadiene and acrylo nitrile polymer. The NBR formulas typically contains between 30% and 50% acrylonitrile (ACN). The NBR which has a working temperature between -30°C and +105°C (peak temp. at +130°C) show extremely high resistance under different working conditions such as mineral oils (H, H-L and H-LP type lubricating oils) and grease and mineral based fire resistance oils (HFB and HFC group oils), vegetable and organic oils, and aliphatic hydrocarbons (propane, butane, petrol). NBR is not recommended for aromatic hydrocarbons (benzene, trichloroethylene, HFD type fire resistance oils), glycol and ether contained break hydraulics. NBR-fabric is a synthetic woven NBR material which enhances the durability of the seal. Polyacetal (POM) (Polyoxymethylene) materials are used as back-up rings or guidening element materials in hydraulic and pneumatic systems. There are two types of POM, filled with or without fibreglass, depending on their use. Despite working temperatures ranging from -40°C to +140°C, real dimensions can not remain stable in excess of 100°C. It can be used safely with mineral oils and HFA, HFB type oils. Types with added fibreglass provide longer lasting contact pressure resistance.
