STE103-250-227-016 is a double acting piston seal that works as double acting - 3 pieces and can be used in piston applications. The material used on this double acting piston seal is made of PTFE/NBR/POM 80 shore. The maximum allowed pressure is 400 BAR.
The dimensions has an inner diameter of 227 mm, an outer diameter of 250 mm and a height of 16 mm.
About the sealing profile STE103
STE103 heavy duty piston seals are used on double acting hydraulic cylinders. These consists of two thermoplastic support rings, one NBR ring and PTFE sealing ring. This piston seal profile is very effective in heavy duty operations.
About the material PTFE/NBR/POM
Teflon (PTFE) can be used as virgin, or used within fillers in order to improve mechanical performance. The fillers’ effects on PTFE are to improve extrusion resistance, reduce friction and form changes under extreme heat conditions. In addition, it increases resilience to attrition and hardening. 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. 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.
