WCP 20

Description
Product group: Rotary shaft seal
Design: C metal outer coat + rigidity ring
Profile no.: 20
Seal material: PTFE + carbon fibre 
Elastomer ring: FKM
Colour: grey
Metal cages: stainless steel 1.4301 (AISI 304)

Operational application limits
Pressure: up to 10 bar (dependent on the other operating parameters)
Temperature (°C): -90 to +250
Peripheral speed (m/s): ≤ 40

Media
All types of oil, water, water-oil emulsion, hot-air, broad chemical resistance to a great number of aggressive media.

Function
The WCP20 is a single acting rotary shaft seal for rotating or pivoting shafts offering a very long service life. Excellent sealing performance is guaranteed by the pre-stressed PTFE sealing lip which has a very low friction coefficient providing lower starting resistance and avoiding stick-slip problems. As a result the WCP20 also works well in applications where there is insufficient lubrication or dry running. Due to a low heat developement the seal can be used at high peripheral speeds and with pressures up to 10 bar, however consideration should be given to the p x V factor (i.e. the product of pressure and peripheral speed ≤40bar m/s). To guarantee a high degree of static sealing on the outer diameter of the seal a good quality surface finish is required as follows:
Ra = 0.8 bis 3.2 µm
Rz = 6.3 bis 16 µm
Rmax ≤ 16 µm

Surface finish of the housing bore is extremely important and processing marks or damage, such as scratching, scoring, dents or cavities are not permissible, particularly when the application is in combination with thin fluid or gaseous media, or split housings are used. To achieve better static sealing in these applications an additional coat of sealing paint can be applied to the outer metal case.

Areas of application
Generally used for sealing of rotating shafts, hubs, axles or other machine elements at high peripheral speeds, high pressures and/or high temperatures. Also used extensively for sealing of aggressive media or in applications where there is insufficient lubrication or dry running due to the excellent chemical resistance and very good  friction coefficient provided by the PTFE sealing lip.