Rapid screen deck wear means constant shutdowns: steel decking rusts through and is pierced by coarse fractions, rubber fails on abrasive solids, and every replacement stops the node. Polyurethane screens and shaker parts wear 2-5 times more slowly than rubber, absorb impact, and are replaced panel by panel. This article covers what these products are made of, why polyurethane wins in numbers over rubber and wear-resistant plastic, and how to order decking for your screen.
What Polyurethane Screens and Shaker Parts Are
Polyurethane screens are perforated screening panels that classify material by fraction in the screen box of a vibrating screen. They are manufactured from cast polyurethane by the free-casting process, giving enhanced wear resistance, moisture and chemical resistance, and operation in the range from -60 to +100 °C. Panels sit where the deck is under constant abrasive loading, and thanks to polyurethane they last several times longer than rubber equivalents.
Alongside the deck itself, the set of shaker parts includes box, chute, and bunker linings, wear-resistant inserts, and conveyor rollers. Free casting allows any aperture geometry and panel layout to be reproduced for a specific box, so each panel is made precisely to your aperture pitch and fastening pattern. This directly affects screening accuracy and the open area of the deck.
Aperture shape is selected not arbitrarily but for the fraction and moisture content of the material. Straight cylindrical holes give a precise cut on dry bulk solids, while conical taper opening downward reduces particle bridging at the fraction boundary and aids passage of wet fines. The lands between perforations set deck stiffness: excessively sparse holes weaken the panel; excessively dense ones reduce open area, so pitch is calculated to balance strength and throughput.
Advantages of Polyurethane over Rubber and Plastic
Polyurethane outperforms rubber in service life and wear-resistant plastic in impact absorption. The table compares the material with SBR rubber and ultra-high-molecular-weight polyethylene UHMW-PE using DIN 53516 and Matweb data.
| Property | Cast polyurethane | SBR rubber | UHMW-PE |
|---|---|---|---|
| Abrasion DIN 53516, mm³ | 38-39 | 100-200 | 15-30 |
| Operating temperature, °C | -60…+100 | -40…+80 | -200…+80 |
| Density, g/cm³ | 1.05-1.25 | 0.94-1.1 | 0.93-0.95 |
| Tensile strength, MPa | 39-87 | 8-20 | 17-45 |
| Rebound elasticity, % | 34-61 | 30-55 | 5-10 |
UHMW-PE actually shows even lower abrasion — 15-30 mm³ versus 38-39 mm³ for polyurethane — but its rebound elasticity is only 5-10 %: the plastic is not elastic, it creeps under load and does not hold deck tension. Polyurethane at 34-61 % rebound vibrates and self-cleans, while against SBR rubber at 100-200 mm³ DIN 53516 it wins on service life by a factor of three to five. The result is the optimum between wear resistance and elasticity specifically for screening decks.
The difference in tensile strength explains why the deck holds its tension: 39-87 MPa for polyurethane versus 8-20 MPa for SBR rubber means the panel does not stretch and sag between fastening points under the weight of material. UHMW-PE is closer to polyurethane on strength, but its creep tendency under sustained loading gradually shifts the aperture pitch and screening accuracy drops. Polyurethane maintains aperture geometry consistently throughout its service life — and for a screen that matters more than minimum absolute abrasion loss in a laboratory test.
Application Industries
Polyurethane screens and shaker parts are used in 12 industries where accurate classification of abrasive bulk solids is required. In mining and metallurgy these are ore and mineral screening applications where steel wears through in months. In oil and chemical processing the value is resistance to moisture and aggressive media in which rubber decking stiffens.
In the food industry polyurethane screens classify product fractions without contamination; in printing and pulp-and-paper they sort raw material and pulp. Common to all industries: the deck is in constant contact with abrasive, so material service life directly determines the maintenance interval and the number of equipment shutdowns.
In construction and non-metallic mineral production, polyurethane screens classify sand, crushed stone, and screenings where steel decking wears through in one season. The light weight of panels and low noise level matter where the screen stands close to workstations. Regardless of industry, the primary selection criterion is the same: how many tonnes pass through the deck between replacements — and on this measure polyurethane outperforms both rubber and steel on abrasive applications.
Engineer’s tip: when selecting decking, consider not only hardness but also the aperture shape for your material. For dry abrasive bulk solids, choose a hard grade with straight holes for service life. For wet fines prone to blinding, choose a somewhat softer grade with conical taper opening downward: the elastic deck self-cleans and maintains open area.
Installation, Hardness Selection, and Maintenance
Polyurethane panels are mounted on the screen box frame with standard fasteners: hold-down bars, bolts, or clips for the box model. The modular design allows one worn row to be removed and replaced without lifting the full deck, so maintenance takes less time. During installation it is important to achieve a level surface and correct panel tension to eliminate local sag and uneven wear.
Hardness is selected for the operating conditions: firm yet resilient grades at 80-95 Shore A for abrasive material, softer grades from 50 Shore A for blinding and impact loads. Maintenance consists of inspecting the deck for through-wear, clearing blocked apertures, and checking fasteners. A technologist will help select the grade and geometry for a specific application; material properties data are in the reference information section.
How to Order Screens Manufactured to Size
To order screens and shaker parts, send the factory a panel layout drawing or a sample of the existing panel with the screen box dimensions, aperture pitch and shape, and fastening pattern. Based on this data the technologist calculates the geometry, selects the hardness for your material, and confirms the lead time. TIMOL factory in Dnipro casts decking and associated parts by the free-casting process, both to standard panels and fully to a bespoke drawing.
For a consultation and cost estimate, contact us via the contacts page. The more precisely you describe the screen, the screened material, and the operating conditions, the closer to optimal will be the polyurethane grade selected — and the longer the deck will run without replacement.