A metal bunker wall wears through in a single season, a rubber-lined trough breaks down on oil contact, and at transfer chutes you constantly hear the rumble of bulk material hitting steel. Sheet polyurethane solves all three problems at once: it wears several times more slowly than rubber, is oil-resistant, and damps impact better than metal. This article explains where polyurethane sheets are applied, how they compare to rubber, steel, and UHMW-PE in real numbers, and how to order sheets or finished pads to size.
Where Sheet Polyurethane Is Used
Sheet polyurethane is used wherever a material works against abrasion from bulk or abrasive media and an elastic, wear-resistant surface is required. The main applications are lining bunkers, troughs, chutes, gravity spouts, and transfer nodes; wear pads on working surfaces; and gaskets, seals, and damping underlays. The sheet is cut to the required shape and fastened to a metal substrate.
In mining and processing plants, polyurethane sheets are used to line the walls of bunkers and chutes through which ore, coal, or crushed stone passes. The abrasive medium wears metal rapidly, while elastic polyurethane absorbs the impact of lumps and lasts longer. In metallurgy, sheets protect transfer nodes and troughs. In the food and chemical industries the sheet functions as a moisture- and chemical-resistant lining that leaves no marks on the product.
A separate application is gaskets and seals cut from sheet. A polyurethane gasket holds pressure, does not swell in oils, and outlasts a rubber counterpart. The free-casting process allows thickness to be set for the specific task, and finished pads with mounting holes can be produced to drawing. Typical products are listed in the product catalogue.
In screening and sorting equipment, wear-resistant screens and decks are made from sheet; they outlast metal screens on abrasive material and blind less readily thanks to the elasticity of the working surface. The elasticity of polyurethane works doubly here: it damps particle impact and at the same time shakes off build-up, which is especially noticeable with wet or clay-laden material. The same resilience is used in damping underlays under equipment, where the sheet absorbs vibration and reduces noise transmitted to the foundation.
Why Sheet Polyurethane Displaces Rubber and Steel
The direct reason for substitution is that polyurethane combines the wear resistance of rubber, oil resistance, and the ability to damp impact — something no single material of this class offers on its own. Rubber lining wears quickly and degrades on petroleum products; a steel wall corrodes, is heavy, and is noisy; a polyurethane sheet addresses all these shortcomings.
Abrasion per DIN 53516: cast polyurethane loses 38-39 mm³, while SBR rubber reaches 100-200 mm³ and NBR rubber 80-150 mm³. This means a service life several times longer — in practice several times longer than standard rubber under identical conditions. For a bunker that previously wore through in a season, this represents a shift from annual repairs to multi-year lining service.
Against steel, a polyurethane sheet wins on weight and acoustics: a density of 1.05-1.25 g/cm³ versus 7.7-7.9 for steel makes the lining several times lighter, while elasticity damps lump impact and noticeably reduces noise at the transfer node. The operating range of -60…+100 °C covers conditions from cold open storage yards to heated production areas, and the tensile strength of 39-87 MPa exceeds that of rubbers. Test methodologies and characteristic explanations are provided in the reference information section.
Comparison of Sheet Materials in Numbers
To make an informed choice of lining material, it helps to see direct numbers against the same parameters. The table compiles reference data from standard tests for sheet materials that compete in wear-resistant nodes.
| Material | Abrasion DIN 53516, mm³ | Operating t, °C | Hardness | Tensile strength, MPa | Density, g/cm³ |
|---|---|---|---|---|---|
| Polyurethane TIMOL | 38-39 | -60…+100 | 85A-95A | 39-87 | 1.05-1.25 |
| SBR rubber | 100-200 | -40…+80 | 40A - 80A | 8-20 | 0.94-1.1 |
| NBR rubber | 80-150 | -30…+100 | 40A - 90A | 10-25 | 1.0-1.3 |
| UHMW-PE | 15-30 | -200…+80 | 60D - 70D | 17-45 | 0.93-0.95 |
| Hardox wear steel | n/a | -40…+250 | 370-540 HB | 1250-1600 | 7.8-7.85 |
Polyurethane has the lowest abrasion among elastomers while remaining resilient, which is critical for damping impact. UHMW-PE wears even less but is nearly inelastic and creeps under sustained load, so it damps lump impact poorly. Hardox wear steel is very strong but several times heavier, does not damp impact and transmits it to the structure, and also corrodes. For nodes combining abrasion and impact simultaneously, sheet polyurethane gives the best balance of wear, weight, and damping.
Engineer’s tip: do not use the same sheet thickness along the full length of a chute. In the zone of direct lump impact specify greater thickness; in sliding sections a thinner sheet is sufficient — this saves material without sacrificing service life. For installation, prefer mechanical clamping-strip fastening in rapid-wear zones: a worn sheet can be replaced in one shift, while bonded lining must be stripped and the surface prepared again.
Installation and Replacement of Lining Sheets
The fastening method depends on how quickly the sheet wears at the node. In zones of intensive abrasion, mechanical fastening with countersunk bolts or clamping strips is used: a worn sheet is replaced in one shift without dismantling the entire lining. In zones of moderate wear, the sheet is bonded to a prepared metal substrate, giving a continuous coating without mounting holes that themselves become local wear points.
For adhesive installation, the metal surface is cleaned of rust and old coating, degreased, and primed for adhesion — the same process used when lining shafts. Proper substrate preparation determines joint service life: unclean or non-degreased metal causes the sheet to peel under impact and vibration. Bolts and clamping strips are positioned away from the zone of direct lump impact so the abrasive does not knock off the heads. Worn sheets are removed and new ones mounted on the same substrate, so the metal structure does not require replacement. Installation and restoration services are described in the factory services section.
How to Order Polyurethane Sheets to Size
To place an order, specify the sheet dimensions, required thickness and hardness, and describe the node’s operating conditions: type and particle size of abrasive, drop height of material, presence of oils or chemicals, and temperature. Based on this data, engineers will select the formulation and calculate the working layer thickness for the specific load rather than offering a single universal sheet.
The factory produces sheets using the free-casting process, so non-standard thicknesses and dimensions are available. In addition to plain sheets, finished pads and gaskets with mounting holes can be produced from a drawing, simplifying installation. This is convenient for a one-off lining repair and for a planned transition of a node from rubber or metal to polyurethane.
A practical rule for the first order: start with the problem area rather than the entire node at once. Replace the lining in the fastest-wearing zone, record how long it lasts compared to the previous material, and use that figure to plan the rest. This gives a real service-life number under your own conditions — not a handbook estimate — and allows you to accurately calculate the economics of transitioning the entire transfer system.
For a calculation tailored to your node, thickness selection, and ordering sheets or pads, contact TIMOL factory. Engineers will help determine the optimal thickness, select the fastening method, and arrange production to your specifications.