BECA 336/AE
Description
The BECA 336/AE profile is a U-ring type single acting piston seal with asymmetrical lips composed of a polyurethane profile ring and a POM back-up ring on the back.
Advantages
Optimised sealing effect at both high and low pressures
Excellent abrasion and wear resistance
Excellent extrusion resistance
Technical data
| Temperature | -30°C/+110°C |
|---|---|
| Pressure | 50 MPa |
| Speed | 0.5 m/s |
| Medias | Mineral hydraulic oils |
Applications
Mobile machinery
Injection presses
Machine tools
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 | ≤ 50 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