Profile Rings

Axial-Static Sealing of Pipe Fittings, Valves and Screws Caps

Profile rings (PRR) of the Dichtomatik brand are designed according to DIN 3869 in order to fit to as many standardized systems as possible. During installation and within the installation housing, the geometry of the seal protects twisting and minimizes mechanical deformation of the cross-section. They are used as axial-static soft seals in combination with threaded elements, e.g. in construction machinery, hydraulic presses, injection molding machines, fittings, hydraulic valves and pipe fittings in the general industry. The profile ring type PRR221 is used as a static seal to replace a combination of O-ring and back-up ring. It is considered twist-resistant and not sensitive to gap extrusion. Frequent use is in hydraulic cylinders of mobile hydraulics, in presses and injection molding machines.

Benefits at a Glance

Easy installation
Minimal cross-section deformation
Low sensitivity to gap extrusion
Good lifetime
Very good price-performance ratio
Suitable for many industrial applications

Important note: Dichtomatik products comply with common industrial standards and therefore are suitable for many applications excluding safety-critical ones like Automotive. Premium Freudenberg products are the right choice for all applications ensuring highest quality and safety standards and therefore optimal total cost of ownership.

Freudenberg Extruded Seals

Choose the Right Product

Out of Three Types

Profile Rings According to DIN 3869

EPDM (temp.: -45 to +150 °C): good resistance to e.g. hot water, steam, silicone oils, polar solvents and diluted chemicals
FKM (temp.: -20 to +200 °C): good resistance to e.g. mineral and synthetic oils, engine, water (max. +80 °C), weathering, ozone and ageing
NBR (temp.: -30 to +100 °C): good resistance to e.g. mineral and hydraulic oils and greases, hydraulic pressure fluids (max. +60 °C) and water (max. +80 °C)

The TPU (PRR221) variant (temp.: -40 to +120 °C) is often used as alternative to an O-ring/Back-up ring combination and shows good resistance to e.g. hydraulic oils and fluids.

Please note that resistances, pressures and temperatures are mutually influenced by various parameters.