STA120-105-125-040 is a v-pack rod that works as single acting - 7 pieces and can be used in rod applications. The material used on this v-pack rod is made of NBR/NBR-FABRIC/POM 90 shore. The maximum allowed pressure is 400 BAR.
The dimensions has an inner diameter of 105 mm, an outer diameter of 125 mm and a height of 40 mm.
About the sealing profile STA120
STA120 Packings are made up of several “V” shaped rings in combination that are preformed and moulded with NBR applied on NBR-fabric. They consist of 7 elements in total. The front consists of 1 POM ring, then 3 fabriced NBR middle rings, 2 NBR middle rings and lastly 1 fabriced NBR back ring. These packings are recommended to be used in rod applications. It is not recommended to overpress the rings during assembly because it will lead to high friction.
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.
