BECA 478
Description
The BECA 478 profile is a wiper seal composed of a thin brass wiping lip assembled in tandem with a second rubber wiping lip in a metal shell. This seal is designed to efficiently remove the solid particles (ice, mud) and all other impurities that stick to the rod.
Advantages
Very good external wiping effect even for stubborn soiling (ice, mud)
Very good abrasion resistance
Assembly in open groove
Technical data
| Temperature | -40°C/+100°C |
|---|---|
| Speed | 1 m/s |
| Medias | Mineral oils |
Applications
Cold and heavily contaminated environments
Agriculture
Mobile machinery
Material handling - Lifting
Hydraulic cylinders
Materials
Primary sealing lip
Brass
Secondary sealing lip
NBR 70 Shore A
Metal cage
Steel
Dimensions
Materials
Metal cage
The table below shows the materials that we can offer for metal cages and springs.
| Application | Material | Standard | Characteristics |
|---|---|---|---|
| Metal cage | Non-alloy standard steel | AISI 1010 (DIN 1624) |
Cold rolled steel |
| Metal cage | Nickel chrome steel | AISI 304 (DIN 1.4301 - V2A) |
Standard stainless steel |
NBR
Nitrile rubber (NBR) is the general term for acrylonitrile-butadiene copolymer. The ACN content can vary between 18% and 50%. While the acrylonitrile content is important, the resistance to oil and fuel is more so. Conversely, the elasticity and compression set are not as good. The NBR has good mechanical properties and good wear resistance. However, its resistance to atmospheric agents and the ozone is relatively low.
| Chemical resistance | Aliphatic hydrocarbons (propane, butane, petroleum, diesel fuel) Mineral oils and greases Fire-resistant fluids (HFA, HFB and HFC) Diluted acids, low-temperature alkaline and saline solutions Water (up to +100°C max) |
|---|---|
| Compatibility issue | Fuels with high aromatic content Aromatic hydrocarbons (benzene) Chlorinated hydrocarbons (trichlorethylene) Polar solvents (ketone, acetone, acetic acid, ethylene-ester) Strong acids Glycol-based brake fluids Atmospheric and ozone agents |
| Temperature range | -30°C/+100°C -40°C / +100°C with our low-temperature NBR |
Brass
The brasses are alloys composed of copper and zinc with varying proportions.
Technical data
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 |
Chamfer
The chamfer length as well as the chamfer angle are determined by the rod seal.
Only on request