XR FKM

Description
Product group: XR X-Ring
Materials: NBR, NB 70, FKM, FP 70
Colour: NBR 70, black, FKM 80, black

Operational application limits
Temperature NBR: -30 °C to +100 °C
Temperature FKM: -15 °C to +200 °C
Other materials such as VMQ, EPDM and H-NBR are also available, on request.

Pressure (MPa): 
dynamic, reciprocal movement to 5 MPa, to 20 MPa with back-up rings
static to 5 MPa, to 40 MPa with back-up rings

Speed (m/s):
reciprocal ≤ 0.5
rotary ≤ 2

Function
X-rings are twin-action 4-lipped seals with an almost square cross-section profile. The X-rings achieves its sealing effect by being installed and compressed within an axial or radial installation housing. Under operating conditions, the pressure of the medium reinforces the sealing function.

Applications
X-rings are comparable with the O-ring in their handling and use. For example, they are used for the radial and axial sealing of flanges, sleeves and covers (static application) and for sealing pistons and rod seals, rotating shafts and helical movements (dynamic). X-rings are used primarily for dynamic applications, as they require less pretensioning than O-rings and therefore give rise to less abrasion. They are very often used for quasi-static applications, such as adjustment and swivelling movements. They are also used for modern roller chains, such as motor bike chains, for example.