Static Seals
Square ring
Good alternative to O-rings for flange sealing – also under higher pressures, will only slightly deform.
Square ring
A Square ring is a double-acting axial static sealing element, which is a good alternative to the classic O-ring. Due to its square profile, it only gets minimally deformed when put under pressure. This sealing element is very insensitive towards gap extrusion, no Back-up ring is necessary even at high pressures and it does not twist during installation.
Square rings are ideal for sealing flanges, valves, plates and fasteners and are available in a variety of common elastomer materials. The most common of these would be NBR, FKM, EPDM, CR, VMQ and FVMQ.
Dimensions are available according to AS 568 (inch sizes).
| material | NBR |
| pressure | up to 50 MPa (from 50 MPa depending on seal gap) |
| temperature | -30°C / +80°C (material dependent) |
| speed | - |
| material | FKM |
| pressure | up to 50 MPa (from 50 MPa depending on seal gap) |
| temperature | -20°C / +200°C (material dependent) |
| speed | - |
| material | EPDM |
| pressure | up to 50 MPa (from 50 MPa depending on seal gap) |
| temperature | -40°C / +130°C (material dependent) |
| speed | - |
Your contact person regarding
Technical topics - special designs
Do you have any questions, ideas or suggestions?
We would be happy to advise you.
Personally, by phone or in digital form.
Mr. Andreas Raidt+49 (0) 7034 2518 - 240