---
title: "Corrosion Resistance of Polyurethane Parts: Comparison with Steel and Rubber"
description: "Explore the corrosion resistance of polyurethane. Compare it with rubber and steel, and learn how to choose and order corrosion-resistant components at TIMOL."
lang: "en"
date: "2026-10-30"
canonical_url: "https://timol.com.ua/en/statti/antykoroziynist-poliyuretanovykh-detaley"
---
# Corrosion Resistance of Polyurethane Parts: Comparison with Steel and Rubber

Steel bushings or linings in mining and metallurgical enterprises often fail not due to wear, but because of rust. Even alloyed steels corrode over time, and rubber seals crack and lose their integrity when in contact with water or reagents. Polyurethane parts radically solve these problems, as they do not rust or deteriorate in wet and aggressive environments. This article analyzes the engineering nature of polyurethane's corrosion resistance, compares it with metal and rubber, and shows how to correctly select and order a component for your technology.

## Why Polyurethane Parts Do Not Rust
Polyurethane is not prone to corrosion because it does not contain metals in its structure and does not react with water, salts, or acids. Even in environments where steel is destroyed by electrochemical corrosion, polyurethane bushings, linings, scrapers, and sheets maintain their integrity. In practice, this means that polyurethane products do not rust when in contact with wet ores, clay slurries, fertilizers, chemical reagents, or raw materials with high salt content.

Moreover, polyurethane does not require additional protection, painting, or lubrication. Its structure remains chemically stable over many work cycles, even with temperature fluctuations. As a result, polyurethane parts are widely used in mining, metallurgy, the food industry, and railway transport, where metal rust leads to emergency stops and costly repairs.

Experience shows that in nodes working with wet bulk materials, polyurethane lining or guides last several times longer than steel. They are not subject to either surface or deep corrosion, maintaining geometry and strength even in areas of aggressive chemical exposure. This is especially valuable for nodes that are difficult to service or operate in a continuous production cycle.

## Comparison of Polyurethane, Steel, and Rubber in Corrosion Resistance
Polyurethane stands unrivaled in corrosion resistance: it does not deteriorate under the influence of water, acids, alkalis, and salts. Carbon steel, even with protective coatings, still gradually rusts, especially in areas where the paint layer is damaged or in contact with aggressive reagents. Stainless steel resists rust well but has high density, cost, and complex installation in nodes where cushioning is needed. Rubber theoretically does not corrode, but it degrades under the influence of oils, ozone, and ultraviolet, losing elasticity.

The table below allows for a quick comparison of key material indicators for selecting corrosion-resistant components in the industry:

| Material | Corrosion Susceptibility | Abrasion DIN 53516, mm3 | Working Temperature, °C | Density, g/cm3 |
|------------------------------|-----------------------|------------------------|-----------------------|---------------|
| Cast Polyurethane (PU) | does not corrode | 20-45 | -60...+100 | 1.05-1.25 |
| Carbon Steel | high | - | -40...500 | 7.7-7.9 |
| Stainless Steel | does not corrode | - | -200...800 | 7.9-8 |
| Rubber NBR | does not corrode | 80-150 | -30...100 | 1-1.3 |
| Rubber SBR | does not corrode | 100-200 | -40...80 | 0.94-1.1 |

*Abrasion: the lower the value, the higher the wear resistance. Polyurethane is 10 times more wear-resistant than rubber.*

In many real-world applications (e.g., lining chutes or bucket elevators), replacing steel with polyurethane not only completely eliminates the rust problem but also reduces the weight of the structure by 6-7 times. At the same time, the polyurethane part does not lose strength and elasticity in the temperature range from -60 to +100 °C, which is critical for enterprises with a round-the-clock cycle.

## How Polyurethane Replaces Steel and Rubber in Corrosion-Resistant Components
The use of polyurethane is most effective where steel quickly rusts, such as in linings of gravity pipes, chutes, bucket elevators, concrete mixer scrapers, and screen components. In these nodes, combined loads occur: abrasion by abrasive, hydroshock, exposure to wet reagents, or even acids. Metal elements here require regular maintenance: painting, replacing individual segments, lubrication. Rubber seals often break down under the influence of oils and temperature fluctuations, cracking and delaminating.

A polyurethane part, manufactured by the free casting method according to the customer's drawing, immediately addresses these issues. It does not rust, does not require painting, and is not afraid of moisture and chemicals. The installation of polyurethane plates, scrapers, and guides is carried out using standard fasteners: bolts, flanges, or through an adhesive layer to metal. In case of wear, only the working element is replaced, not the entire unit. Polyurethane does not decompose even with long-term contact with water, as confirmed by operation in mining and metallurgical enterprises.

## Advantages of Polyurethane in Various Application Industries
The corrosion resistance of polyurethane is especially valued in industries with high humidity and aggressive environments. In mining and metallurgy, polyurethane linings and scrapers ensure uninterrupted operation of nodes, as they are not prone to rust even with constant contact with wet ore, chemical reagents, or abrasives. In the food industry, polyurethane not only resists corrosion but also does not release impurities into the product, which is important for production safety.

In docks and ports, as well as on railway transport, polyurethane guides, rollers, and linings are resistant to sea water, moisture, snow, and mechanical loads. This allows nodes to be operated without corrosion protection, reducing maintenance and repair costs. In agriculture, polyurethane bucket elevators and bushings are used for transporting wet fertilizers, grain, and feed, where metal quickly rusts and loses strength.

## Selecting Hardness for Corrosion-Resistant Polyurethane Products
The hardness of polyurethane is selected based on the type of load in the node. For abrasive and wear-resistant nodes, such as screens, linings, and scrapers, it is recommended to use polyurethane with a hardness of 80-95 Shore A. In this range, the material retains elasticity, effectively absorbs abrasive impacts, and prevents moisture or reagents from penetrating the structure of the part. This is critical for nodes that undergo constant mechanical impact and operate in a humid environment.

For seals, gaskets, and packings, polyurethane with a hardness of 70-90 Shore A is used. This material combines sufficient elasticity for dynamic nodes with wear resistance. Hard grades (Shore D) are used in structural nodes where geometric stability is paramount, but for corrosion-resistant and abrasive loads, this is not the optimal choice.

> **TIMOL Engineer's Tip:** For lining chutes and gravity equipment in the mining or metallurgical industry, choose polyurethane 80-95 Shore A. This ensures maximum abrasion resistance and absence of corrosion over years of operation.

The free casting technology allows for the production of parts of any geometry, thickness, and hardness according to your drawing. This is especially important for non-standard nodes where a combination of corrosion resistance, wear resistance, and precise fit in the assembly unit is required.

## Where It Is Beneficial to Replace Metal with Polyurethane in Terms of Corrosion Resistance
It is especially advisable to switch to polyurethane where steel parts operate in contact with water, reagents, or abrasives. This includes lining chutes and gravity pipes, conveyor belt scrapers, bucket elevators, and raw material feed elements. Polyurethane not only eliminates corrosion but also reduces downtime for repairs: no painting is needed, no scale or rust removal is required, and there are no issues with jamming due to swelling or delamination.

The economic effect lies in reducing maintenance and spare parts costs. Switching to polyurethane allows for scheduled maintenance of nodes rather than emergency wear. This provides stable equipment operation, reduces the number of unscheduled stops, and increases the overall efficiency of the line.

## Practical Aspects of Manufacturing, Installing, and Ordering Corrosion-Resistant Products
Polyurethane products are manufactured by the free casting method according to the customer's drawing or sketch. This allows for obtaining a part of the required shape, thickness, and hardness, including holes, slots, grooves, etc. Typical fastening methods include flanges, bolts, and adhesive application of a polyurethane layer on a steel base. For complex nodes, material combinations are possible, such as steel reinforcement inside the polyurethane lining.

Maintenance of polyurethane parts is simple: they do not require painting or lubrication, do not rust, and do not delaminate. In case of wear, it is sufficient to replace only the working element without dismantling the entire structure. Parts are made to order, which is especially beneficial for non-standard nodes or when a quick replacement is needed. TIMOL accepts drawings in digital and paper form, which speeds up the calculation and manufacturing process. Learn more about polyurethane and the manufacturing technology in the [reference information](/informatsiya), and see the full range of products in the [polyurethane products catalog](/katalog).

## Conclusion: Polyurethane Corrosion Resistance, the Key to Stable Node Operation
Switching to polyurethane in nodes where corrosion occurs completely eliminates the rust problem, reduces repair costs, and decreases accidents. Polyurethane does not rust, does not decompose, lasts 10 times longer than rubber, and does not require additional protection even in the most challenging operating conditions. Contact TIMOL for consultation, calculations according to drawings, and ordering corrosion-resistant products for your industry. Contact details are available on the [TIMOL Factory Contacts](/contacts) page.