A metal part that has to be replaced every quarter, a rubber scraper that wears away in a month, a plastic bushing that cracks from an impact, all these are symptoms of a wrongly chosen material. Cast polyurethane often closes several such problems at once, because it combines wear resistance, elasticity and chemical resistance. Let us break down the specific advantages of polyurethane products in numbers and show exactly where they beat rubber, steel and plastic.
The Main Advantage of Polyurethane: Wear Resistance in Numbers
The key reason to choose polyurethane is its resistance to abrasion. In the standard DIN 53516 test, cast polyurethane loses only 38-39 mm³ of volume, whereas common SBR rubber loses 100-200 mm³, and natural rubber 60-130 mm³. By verified data, the factory estimates the wear resistance of polyurethane as roughly 2-5 times higher than standard rubber. In joints with abrasives this translates directly into a longer service life and less frequent replacement.
At the same time polyurethane is not brittle like many hard plastics. It absorbs impact thanks to its elasticity and returns to shape after deformation, which neither steel nor cast nylon does. It is precisely this combination of hardness and elasticity that makes it unique: the part simultaneously resists abrasion and absorbs impact rather than splitting from it.
Elasticity, Strength and Low Residual Deformation
Polyurethane stays serviceable across a wide range of loads, because it has high strength and low residual deformation. The tensile strength of cast polyurethane is 39-87 MPa against 8-20 MPa for SBR rubber, and the tear resistance is 40-120 kN/m. This means the part is harder to tear at edges and corners, where rubber fails first.
Low residual deformation gives another practical advantage: a polyurethane part does not settle under constant load the way rubber does. A bushing does not wobble loose, a seal does not lose its tension, a buffer does not sag. Thanks to this, the joint retains its original geometry and working precision longer, which is especially important in suspension, hydraulics and conveyor lines.
Comparison Table: Polyurethane Versus Other Materials
The figures below are compiled from standard engineering references for rubber, steel and plastic alongside the verified characteristics of TIMOL polyurethane. They show why one material often replaces several others at once.
| Characteristic | TIMOL Polyurethane | SBR Rubber | Steel St3 | Cast Nylon PA6 |
|---|---|---|---|---|
| Abrasion DIN 53516, mm³ | 38-39 | 100-200 | n/a | 30-90 |
| Working temperature, °C | -60…+100 | -40…+80 | -40…+500 | -40…+100 |
| Density, g/cm³ | 1.05-1.25 | 0.94-1.1 | 7.7-7.9 | 1.13-1.15 |
| Tensile strength, MPa | 39-87 | 8-20 | 370-700 | 60-85 |
| Resistance to lubricants | excellent | low | good | good |
| Vibration damping | good | good | poor | poor |
Steel wins on tensile strength and temperature, but weighs six to seven times more, corrodes and does not damp vibration. Cast nylon is close on abrasion, but is brittle and absorbs moisture. Polyurethane gives a balanced set of properties that covers most wear and impact joints.
TIMOL engineer’s tip: do not choose a material by a single figure. For example, cast nylon is close to polyurethane on abrasion, but under impact load it splits because it is not elastic. And steel is durable against abrasion only in wear-resistant grades, but it transmits all impacts to the structure. Look at the combination of wear plus impact plus environment, and then polyurethane more often turns out to be optimal.
Lightness, Quietness and Operational Safety
Low weight is an underrated advantage of polyurethane. At a density of 1.05-1.25 g/cm³, a part of the same volume weighs roughly six to seven times less than a steel one with a density of about 7.7-7.9 g/cm³. This reduces the load on shafts and supports, eases the installation of large lining sheets and reduces the inertia of moving elements.
Polyurethane also reduces noise and vibration in the joint. Where steel rollers and scrapers rattle and transmit impacts to the frame, polyurethane ones run noticeably quieter. Add to this the absence of corrosion and chemical resistance, and you get a part that not only serves longer, but also improves the working conditions of the equipment and the personnel.
Where the Advantages of Polyurethane Show Most Clearly
The advantages of the material are most noticeable in joints where wear, impact and an aggressive environment come together. These are conveyor scrapers and lining, rollers and wheels, elevator buckets, screening decks, hydraulic seals and cuffs, suspension bushings and buffers. Cast polyurethane is used in 12 industries, from agriculture and mining to the food and pharmaceutical industry.
The versatility explains why enterprises switch to polyurethane for whole groups of parts at once. Instead of several different materials with different weak spots, they get one predictable characteristic. An overview of typical products is collected in the catalog, and the factory’s production capabilities are described on the services page.
Summary: When Polyurethane Is More Beneficial
The advantages of polyurethane products come down to a simple balance: high wear resistance, elasticity, low weight, resistance to lubricants and a wide temperature range in a single material. It loses to steel only where ultimate strength or a temperature above +100 °C is required, and in the remaining wear and impact joints it gives a longer service life and lower maintenance costs than rubber, plastic or metal.
To select the material and hardness for a specific joint or to order production from a drawing, contact the TIMOL factory through the contacts. An engineer will assess the working conditions of the part and propose the optimal solution for your task.