BECA 335P/AE
Description
The BECA 335P/AE profile is a polyurethane U-ring type single acting piston seal with symmetrical lips and a POM back-up ring.
Advantages
Optimised sealing effect
Excellent abrasion resistance
Very good extrusion resistance
Very good wear resistance
Technical data
| Temperature | -30°C/+110°C |
|---|---|
| Pressure | 45 MPa |
| Speed | 0.5 m/s |
| Medias | Mineral hydraulic oils |
Applications
Agriculture
Mobile machinery
Lifting systems
Injection presses
Hydraulic cylinders
Materials
Profiled seal
PU 93 Shore A - Blue
PU 96 Shore A - Blue
High temp. PU 96 Shore A - Beige
Back-up ring
Polyoxymethylene (POM)
Dimensions
Materials
PU
Polyurethane is a material that has the elastic properties of rubber. The proportion in its composition (diisocyanate, polyol, chain extender) is determined by its properties. This material is characterised by a strong mechanical resistance, good wear resistance, high elastic modulus, good flexibility and a very good ozone and oxidation resistance.
| Chemical resistance | Pure aliphatic hydrocarbons (propane, butane) Mineral oils and greases Silicone oils and greases Water up to +50°C |
|---|---|
| Compatibility issue | Ketones, esters, ethers, alcohols and glycols Hot water, steam, alkalis, amines and acids |
| Temperature range | -30°C/+90°C -30°C / +110°C with our PUHT (short term peak at 150°C) |
Polyoxymethylene - POM
Polyoxymethylene (POM or polyacetal) belongs to the thermoplastics, which have a number of advantages - strong mechanical resistance, good creep strength, high resistance to shocks, particularly at low temperatures, good wear resistance, good sliding coefficient, excellent machinability and good dielectric properties. The low water absorption coefficient, unlike polyamide (PA), also gives this material an excellent dimensional stability.
| Chemical resistance | Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel) Mineral oils and greases Fire-resistant fluids (HFA, HFB and HFC) Water |
|---|---|
| Compatibility issue | Acids |
| Temperature range | -50°C/+115°C |
Technical data
Extrusion gaps
| Bore diameter ØD1 |
Radial extrusion gap F/2 |
|||||
|---|---|---|---|---|---|---|
| ≤ 5 MPa | ≤ 10 MPa | ≤ 20 MPa | ≤ 30 MPa | ≤ 40 MPa | ≤ 45 MPa | |
| ≤ 60 mm | 0.40 | 0.30 | 0.20 | 0.15 | 0.10 | 0.07 |
| > 60 mm | 0.50 | 0.40 | 0.30 | 0.20 | 0.15 | 0.10 |
Surface roughness
| Roughness | Dynamic surface area | Static surface area | Groove flanks |
|---|---|---|---|
| Ra | 0.1 - 0.4 µm | ≤ 1.6 µm | ≤ 3.2 µm |
| Rz | 0.63 - 2.5 µm | ≤ 6.3 µm | ≤ 10.0 µm |
| Rmax | 1.0 - 4.0 µm | ≤ 10.0 µm | ≤ 16.0 µm |
Chamfers and radius
| Radial section S |
Radius R1 |
Radius R2 |
Chamfer C |
|---|---|---|---|
| 3.00 | 0.20 | 0.40 | 2.00 |
| 4.00 | 0.20 | 0.40 | 2.50 |
| 5.00 | 0.40 | 0.60 | 3.00 |
| 7.50 | 0.80 | 1.00 | 4.00 |
| 10.00 | 0.80 | 1.00 | 5.00 |
Only on request