BECA 507 - 508
Description
The BECA 507-508 profiles are double acting composite piston seals composed of a filled PTFE friction ring, static O'Ring and dynamic rubber O'Ring / X'Ring. They can be assembled in grooves according to standard ISO 7425/1. Option of connecting the seal to 1 or 2 back-up rings.
Advantages
Optimal sealing for separating two fluids
Low friction coefficient; no stick-slip effect
Excellent abrasion resistance
Wide temperature range and excellent chemical resistance, depending on the material selected for the O'Rings
Technical data
| Temperature | -30°C/+200°C |
|---|---|
| Pressure | 50 MPa |
| Speed | 2 m/s |
| Medias | Mineral hydraulic oils |
Applications
Mobile machinery
Machine tools
Presses
Hydro-pneumatic suspension systems
Materials
Friction ring
Bronze-filled PTFE
Carbon-filled PTFE
GL Blue PTFE
O'Ring / X'Ring
NBR 70 Shore A
FKM 70 Shore A
O'Ring
NBR 70 Shore A
FKM 70 Shore A
Dimensions
Installation dimensions
Installation dimensions
| Bore diameter ØD1 H9 |
Groove diameter | Groove width | Radial section | Cross-section | O'Ring/X'Ring cross-section |
|
|---|---|---|---|---|---|---|
| BECA 507 Standard series |
BECA 508 Light series |
Ød1 h9 | L1 0/+0.20 | S | Ød2.1 | Ød2.2 |
| 15.0 - 39.9 | 40.0 - 79.9 | D1 - 11.00 | 4.20 | 5.50 | 3.53 | 1.78 |
| 40.0 79.9 | 80.0 - 132.9 | D1 - 15.50 | 6.30 | 7.75 | 5.33 | 1.78 |
| 80.0 - 132.9 | 133.0 - 252.9 | D1 - 21.00 | 8.10 | 10.50 | 6.99 | 2.62 |
| 133.0 - 252.9 | --- | D1 - 24.50 | 8.10 | 12.25 | 6.99 | 2.62 |
| 253.0 - 462.9 | --- | D1 - 28.00 | 9.50 | 14.00 | 8.40 | 3.53 |
| 463.0 - 700.0 | --- | D1 - 35.00 | 11.50 | 17.50 | 10.00 | 3.53 |
For special applications > 40 MPa, we recommend using an H8/f8 tolerance (bore/piston) or selecting other more suitable materials. Please contact our experts.
Materials
| Friction ring | O'Rings | Contact surface area | ||||||
|---|---|---|---|---|---|---|---|---|
| Standard code | ISO code | Material | Colour | Characteristics | Code | Type of material | Service temperature | |
| DP | P | Virgin PTFE | White | Resistance to chemical products Sealing water Dielectric Non-stick Low friction coefficient Food & Beverage |
K6 | NBR 70 Shore A | -30°C/+100°C | Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| F6 | VMQ 70 Shore A |
-60°C/+200°C | ||||||
| DC | C | PTFE +25% Carbon |
Grey |
Improvement
Good resistance to chemical products Efficient as part of dynamic |
K6 | NBR 70 Shore A | -30°C/+100°C | |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| CG | C | PTFE + 23% Carbon + 2% Graphite |
Black | K6 | NBR 70 Shore A | -30°C/+100°C | ||
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| DV | V | PTFE + 25 % Glass |
Blue | Improvement
corrected with the addition of MOS2 Chemical and dielectric properties preserved Well suited to applications with rotating and simultaneous alternating movements |
K6 | NBR 70 Shore A | -30°C/+100°C | Steel Chrome steel Cast iron |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| VM | M | PTFE + 15 % Glass + 5% MoS2 |
Grey | K6 | NBR 70 Shore A | -30°C/+100°C | ||
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| DX | X | GL Blue PTFE + Glass + Metal oxides |
Turquoise blue | Compression resistant Wear resistant Excellent chemical stability Good thermal conductivity |
K6 | NBR 70 Shore A | -30°C/+100°C | |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| DG | G | PTFE + 15% Graphite |
Black | Improvement
Self-lubricating Thermal and electrical conductivity Low permeability Good friction coefficient Anti-static Efficient as part of dynamic dynamic applications with self-lubrication |
K6 | NBR 70 Shore A | -30°C/+100°C | Steel Stainless steel Chrome steel Aluminium Bronze Cast iron Treated surface |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| K1 | K | PTFE + 10% Ekonol |
Light brown | Improvement
Good friction coefficient and low permeability |
K6 | NBR 70 Shore A | -30°C/+100°C | |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| K2 | K | PTFE + 20% Ekonol |
Light brown | K6 | NBR 70 Shore A | -30°C/+100°C | ||
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| C6 | EPDM 70 Shore A | -45°C/+150°C | ||||||
| DB | B | PTFE + 60% Bronze |
Dark brown | Improvement
Electrical and thermal conductivity Does not alter metal parts Reduced resistance to certain chemical products Used for dynamic seals with a strong compression and low level of wear |
K6 | NBR 70 Shore A | -30°C/+100°C | Steel Chrome steel Cast iron |
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
| B4 | B | PTFE + 40% Bronze |
Dark brown | K6 | NBR 70 Shore A | -30°C/+100°C | ||
| G6 | FKM 70 Shore A | -20°C/+200°C | ||||||
Other grades of materials are available depending on your specificities.
Technical data
Extrusion gaps
| Radial section S |
Radial extrusion gap F/2 |
||
|---|---|---|---|
| 10 MPa | 20 MPa | 40 MPa | |
| 5.50 | 0.25 | 0.15 | 0.10 |
| 7.75 | 0.30 | 0.20 | 0.15 |
| 10.50 | 0.30 | 0.20 | 0.15 |
| 12.25 | 0.30 | 0.20 | 0.15 |
| 14.00 | 0.45 | 0.30 | 0.25 |
| 17.50 | 0.55 | 0.40 | 0.35 |
Surface roughness
| Roughness | Dynamic surface area | Static surface area | Groove flanks |
|---|---|---|---|
| Ra | 0.05 - 0.2 µm | ≤ 1.6 µm | ≤ 3.2 µm |
| Rz | 0.4 - 1.6 µm | ≤ 6.3 µm | ≤ 10.0 µm |
| Rmax | 0.63 - 2.5 µm | ≤ 10.0 µm | ≤ 16.0 µm |
Chamfers and radius
| Radial section S |
Radius R1 |
Radius R2 |
Chamfer C |
|---|---|---|---|
| 5.50 | 0.30 | 1.00 | 3.00 |
| 7.75 | 0.30 | 1.30 | 3.00 |
| 10.50 | 0.30 | 1.80 | 5.00 |
| 12.25 | 0.30 | 1.80 | 6.00 |
| 14.00 | 0.30 | 2.50 | 8.00 |
| 17.50 | 0.30 | 3.00 | 10.00 |
Only on request