Steel screen decking on a concentrating plant gets pierced by coarse ore fractions and rusts, rubber decking fails quickly on sharp abrasive, and every deck change stops the whole node for welding work. Polyurethane screens withstand the impact of large lumps, wear 2-5 times more slowly than rubber, and are replaced modularly without dismantling the screen. This article covers why polyurethane wins in the mining industry, which screen parts should be converted first, and how to order decking for your box.
Why Polyurethane is Better than Steel and Rubber on Ore
A polyurethane screen combines wear resistance with impact toughness — and this combination is decisive on ore. The material lasts several times longer than rubber on abrasion, and unlike rigid wear steel it elastically absorbs the impact of large lumps instead of deforming or being pierced. The operating range from -60 to +100 °C permits screen operation both on cold quarry platforms and on hot material after drying.
The material does not corrode in the wet beneficiation process where steel rusts in weeks, and it reduces in-plant noise levels by nearly half compared with metal decking that clangs with every lump strike. The light weight of panels simplifies manual replacement at the screen height. Hardness is selected for the ore: harder yet resilient grades at 80-95 Shore A maximally resist abrasive; softer grades self-clean better from wet fines.
A further argument for polyurethane is screening quality itself. Elastic decking vibrates with the screen box and keeps apertures cleaner, which means stable open area and accurate fraction cut throughout the full panel service life. Metal decking with apertures worn to ovals passes oversize long before the deck is worn through, so the actual usable life is even shorter than external appearance suggests.
Material Comparison in Numbers
The difference is conveniently assessed on standard indices. The table compares polyurethane with Hardox wear steel and SBR rubber using DIN 53516, ISO 37, and Matweb data.
| Property | Cast polyurethane | Hardox wear steel | SBR rubber |
|---|---|---|---|
| Abrasion DIN 53516, mm³ | 38-39 | n/a | 100-200 |
| Operating temperature, °C | -60…+100 | -40…+250 | -40…+80 |
| Density, g/cm³ | 1.05-1.25 | 7.8-7.85 | 0.94-1.1 |
| Tensile strength, MPa | 39-87 | 1250-1600 | 8-20 |
| Hardness | 50 Shore A - 70 Shore D | 370-540 HB | 40-80 Shore A |
Hardox has enormous tensile strength and hardness of 370-540 HB, but it is heavy and does not damp impact: the energy of large lumps goes into the box and screen supports. Polyurethane is six to seven times lighter and elastic, so it removes the impact load from the structure. Against SBR rubber at 100-200 mm³ DIN 53516, polyurethane’s 38-39 mm³ means three to five times longer service life on the same abrasive.
The thermal comparison also favours polyurethane in typical plant conditions. The operating range from -60 to +100 °C covers both cold quarry platforms and warm post-dryer material, whereas SBR rubber is limited to about +80 °C and stiffens in hard frost. Steel withstands higher temperatures, but in wet beneficiation its main problem is not heat but corrosion: polyurethane in this environment does not rust at all, requires no protective coating, and does not contaminate pulp with corrosion products.
Which Screen Parts to Convert to Polyurethane First
The logical starting point is the screen deck itself as the fastest-wearing node, then moving to box, chute, and bunker lining where ore falls. Polyurethane panels are cast by the free-casting process as modular sections to the box dimensions, and a worn deck is replaced section by section without dismantling the full screen. This is the primary maintenance time saving.
Along with screens, wear inserts, scrapers, and conveyor rollers where abrasive friction wears metal are converted to polyurethane. The full list of typical products for screens and beneficiation equipment is in the product catalogue. Together these conversions extend the continuous operating time of the node and reduce the number of repair shutdowns.
The practical conversion sequence: first change the decking on the most loaded decks where wear is fastest and record the actual service life gain on your ore. Then, based on the result, convert the lining at ore drop points and transfer chutes, since these receive the impact-abrasive loading. The step-by-step approach allows the saving on a specific node to be calculated before scaling the conversion to the full screen fleet.
Engineer’s tip: do not chase maximum hardness on wet ore. The upper Shore A limit (closer to 95 Shore A) resists wear well but self-cleans poorly, and apertures blind with fines, reducing screen throughput. For wet fine material, use a somewhat softer grade: elastic deck vibration dislodges build-up and maintains aperture open area.
Installation, Aperture Configuration, and Maintenance
Polyurethane panels are mounted on the screen box frame with standard fasteners: hold-down bars, bolts, or clips for the specific box model. No special tooling is required, and the modular construction allows one panel row to be replaced quickly without lifting the full deck. During installation it is important to achieve correct tension and surface levelness to prevent local sag and uneven wear.
Aperture configuration is selected for the fraction being screened: conical taper opening downward and bridges between perforations reduce blinding and blockage. Maintenance consists of inspecting the deck for through-wear and checking fasteners. Hardness and geometry selection for a specific ore is best agreed with the technologist at the ordering stage; material data are in the reference information section.
Effect for the Plant and How to Order
Switching to polyurethane screens gives a plant three things simultaneously: longer maintenance intervals, less workshop noise, and lower structural loading on the screen box from impact absorption. Modular panel replacement reduces maintenance downtime, and precise apertures improve sorting and reduce useful-fraction losses. Together this directly affects the cost of ore processing.
To place a manufacturing order, send a screen panel layout drawing or panel sample with box dimensions and fastening pattern. TIMOL factory in Dnipro casts decking to size and selects hardness for your ore. For consultation and calculation, contact us via the contacts page, and for more on mining industry applications visit the mining industry page.