---
title: "Repairability of Polyurethane Parts: Comparison, Technology, Experience"
description: "Repairability of polyurethane parts: when to restore and when to replace. Comparison with rubber, steel, caprolon. Consultation from TIMOL factory."
lang: "en"
date: "2026-09-03"
canonical_url: "https://timol.com.ua/en/statti/remontoprydatnist-poliyuretanovykh-detaley"
---
# Repairability of Polyurethane Parts: Comparison, Technology, Experience

A production line halt due to a worn concrete mixer scraper or a worn screen lining results in real losses. When standard rubber, steel, or caprolon parts wear out in a few months, polyurethane allows for restoring the unit without full replacement, minimizing costs and downtime. This article explains how the repairability of polyurethane parts works in practice, what can be recast, what is better replaced, and how it impacts operation in 12 industries.

## Can Polyurethane Parts Be Repaired?
Most industrial polyurethane parts can be restored through repeated free casting if the base or frame is intact. For products with metal inserts, wheels, rollers, concrete mixer scrapers, screen linings, and bands, repair involves fully or partially recasting the polyurethane layer on the existing base. This avoids the need to manufacture a new metal part, reducing downtime and material costs.

In practice, repairs are applied to units where wear is concentrated in the working area. For example, wheel bands in mechanical engineering, scraper blades in mining or metallurgy, screen linings, and gravity equipment. It is crucial that the frame geometry remains suitable for recasting, which is assessed during defect inspection. In small parts without a rigid insert, repairability is lower, but for larger units, recasting is the optimal solution.

## Advantages of Polyurethane Repairability Over Rubber and Steel
Polyurethane excels in repairability due to the free casting technology: a new layer can be applied over the old base or the working area can be fully restored. Rubber products usually require complete replacement after wear, while steel products need welding or machining, which does not always restore geometry 100%. Polyurethane bushings, rollers, linings, and scrapers retain the metal part, which is cleaned, prepared, and recast, significantly reducing service time and material costs.

Compared to caprolon (polyamide), polyurethane parts are easier to restore, as caprolon is mainly repaired through mechanical processing without the possibility of recasting. This flexibility gives polyurethane an advantage where the unit operates under harsh conditions, abrasive loads, impacts, and temperature fluctuations.

### Comparison Table of Repairability and Wear Resistance

| Material | Abrasion (DIN 53516), mm3 | Working t, °C | Repairability |
|-----------------------|---------------------------|-----------------|-----------------------------------|
| Polyurethane (TIMOL) | 20-45 | -60...+100 | Recasting, layer restoration |
| SBR Rubber | 100-200 | -40...80 | Usually full replacement |
| NBR Rubber | 80-150 | -30...100 | Full replacement |
| Caprolon | 30-90 | -40...100 | Limited mechanical restoration |
| Carbon Steel | (no data) | -40...500 | Welding, grinding |

As seen in the table, polyurethane has an abrasion of 20-45 mm3 according to DIN 53516, while SBR rubber has 100-200 mm3, meaning polyurethane's wear resistance is 10 times higher than rubber. Moreover, it can be recast without replacing the entire unit.

## Technological Aspects of Polyurethane Part Repair
Polyurethane product restoration is conducted through repeated free casting. The key requirement is the preservation of the metal frame or base. Before recasting, the part undergoes defect inspection: it is cleaned of old polyurethane residues and undergoes sandblasting or shot blasting to ensure adhesion of the new layer. An adhesive primer is then applied to ensure a reliable bond between the old and new polymer parts.

Restoration is possible for both large cast parts (e.g., screen linings in mining or concrete mixer scrapers in construction) and for rollers, bands, bushings for transport systems. Post-repair installation is standard: the part is returned to the unit, fastened with bolts, flanges, or pressed into place. Serviceability is enhanced since recasting polyurethane does not require changing the unit's geometry.

> **Engineer’s Tip:** If the unit operates with abrasives, plan for an extra thickness of the polyurethane layer (5-10 mm) during manufacturing. This allows for 1-2 recastings without replacing the entire part, especially for scrapers, linings, and bands with a metal base. This approach reduces operational costs several times.

## Impact of Polyurethane Hardness on Repairability
Polyurethane hardness does not limit the possibility of repeated restoration, but the choice of hardness critically affects wear resistance and part longevity. For scrapers, linings, screens, and plates working with abrasives in mining, metallurgy, or pipe rolling industries, the optimal hardness is in the range of 80-95 Shore A. This level provides elasticity that absorbs abrasive particle impacts and allows the part to withstand multiple restorations without losing properties.

For seals, gaskets, and packings in gravity equipment, printing, or food industries, polyurethane with a hardness of 70-90 Shore A is used. In structural parts (e.g., bushings, supports, rings) under static load, the allowable range is up to 70 Shore D. Here, repairability is determined by the condition of the metal frame: if it is undamaged, the polyurethane layer can be recast several times.

## Limitations and Factors Affecting Repairability
Not every polyurethane part is worth repairing. Products with a completely destroyed metal base, severe cracks, or deformations that prevent geometry restoration are only subject to replacement. It is also challenging to restore small parts that operated without a frame: they often lose shape and do not provide adequate adhesion during recasting.

Additionally, field repairs, without factory preparation, do not guarantee the quality of the new polyurethane layer's adhesion. Only in factory conditions, with precise control of temperature, humidity, and surface cleanliness, can results comparable to a new part be achieved. The feasibility of repair is always assessed by a process engineer after defect inspection and base cleaning.

## Opportunities for Node Modernization During Polyurethane Repair
Restoring polyurethane parts opens the way for node modernization. During recasting, the thickness of the working layer can be changed, a different hardness can be selected, and ribs or zones of enhanced wear protection can be added. This is often used in mining and metallurgy industries, where node operating conditions change, for example, increased raw material abrasiveness or load.

To make changes to the design, the customer needs to provide a drawing or model of the part. TIMOL factory engineers recommend analyzing the node together with a technologist to determine modernization parameters. The ability to flexibly change polyurethane properties for the task significantly increases node resource and operational economy.

## How to Order Repair or Manufacture of a Polyurethane Part Based on a Drawing
Organizing the repair or manufacture of a polyurethane part for a unit is not difficult. You need to contact the engineering department of the TIMOL factory with a drawing or sample. After defect inspection of the base and agreement on the optimal polyurethane grade, specialists determine the possibility of recasting or the feasibility of manufacturing a new part. Manufacturing is done by free casting, allowing for complex geometry without batch size limitations.

For more details on the range of products, application industries, and technology features, see the [polyurethane product catalog](/katalog) and the [reference information section](/informatsiya). For consultation on repair or node modernization, contact us through the [contact form](/contacts).

## Practical Conclusion: When Is Restoration Feasible, and When Is a New Part Needed?
Restoration of polyurethane products is feasible if the base and geometry of the part are preserved. It is most beneficial for units with a metal frame: wheels, scrapers, linings, bands. In such cases, recasting polyurethane allows obtaining a new product with less time and cost. If the base is destroyed, the part has lost shape, or has critical damage, it is faster and more effective to order a new part based on a drawing or sample. For the optimal solution, contact TIMOL factory: engineers will help choose the option for your unit.