---
title: "Concrete Mixer Scrapers: TIMOL Polyurethane vs. Rubber and Steel"
description: "TIMOL polyurethane concrete mixer scrapers: 10 times more durable than rubber, gentle on the drum. Comparison, installation, selection, custom orders."
lang: "en"
date: "2026-09-06"
canonical_url: "https://timol.com.ua/en/statti/skrebki-betonosmesitelej"
---
# Concrete Mixer Scrapers: TIMOL Polyurethane vs. Rubber and Steel

In concrete mixers, scrapers encounter abrasive concrete, coarse aggregates, and rebar daily, cleaning the drum and ensuring mix quality. Steel or rubber blades often fail within weeks: wear, chipping, and breakage lead to downtime and product quality loss. Polyurethane scrapers significantly extend the component's lifespan and reduce operating costs. This article explores the properties that distinguish TIMOL polyurethane from rubber and steel, how to select the right hardness for mixer scrapers, and how to order a product based on your own design.

## Why Polyurethane Scrapers Are the Optimal Solution for Concrete Mixers
Polyurethane scrapers for concrete mixers offer 10 times the wear resistance compared to standard rubber, operate in a temperature range from -60 to +100 °C, and maintain elasticity even under impacts from large aggregates. This avoids frequent replacements, maintains constant contact with the drum walls, and ensures effective cleaning.

In concrete mixers, scrapers operate under extremely harsh conditions: the mix acts as an abrasive, with additional stress from impacts with stones, rebar, and aggregates. Steel blades wear quickly, especially at high speeds, while rubber ones lose shape, tear, or detach. Thanks to high elasticity (35-65% rebound) and tensile strength (25-60 MPa), a polyurethane scraper absorbs impacts, repels abrasive particles, and prevents them from cutting grooves. Its resilient structure also protects the drum lining from scratches, extending the equipment's lifespan.

Importantly, polyurethane scrapers not only last longer but also retain their geometry, ensuring uniform cleaning around the entire mixer perimeter. This is particularly crucial for production lines that operate continuously, where any downtime leads to losses.

## What Hardness of Polyurethane to Choose for Scrapers
For concrete mixer scrapers, polyurethane with a hardness of 80-95 Shore A is optimal. This balance between elasticity and wear resistance allows the scraper to effectively remove concrete without deforming or chipping. The choice of Shore A over Shore D is dictated by the physics of abrasive wear: a resilient material absorbs impacts and returns particles without allowing them to cut the scraper's surface.

Polyurethane scrapers with 80-95 Shore A hardness can be installed in units experiencing large load fluctuations, impacts from stones or rebar, and temperature variations. Too hard grades (Shore D) are unsuitable for abrasive wear, prone to chipping, and do not absorb impacts, so they are not used in concrete mixers. The hardness choice depends on the mixer type, aggregate size, and operating mode. In complex cases, TIMOL engineers can help select the optimal composition and hardness for specific conditions.

> Practical tip: For abrasive units in concrete mixers, do not choose hard polyurethanes (Shore D). A resilient material (80-95 Shore A) offers maximum lifespan and does not chip even under impacts from large aggregates.

## Comparison of Polyurethane, Rubber, and Steel for Scrapers: Figures
In concrete mixer scrapers, TIMOL polyurethane significantly outperforms rubber and steel in wear resistance, elasticity, and temperature stability. This is confirmed by specific numerical indicators from reference books:

| Material | Abrasion DIN 53516, mm3 | Working t, °C | Hardness, Shore | Tensile Strength, MPa | Density, g/cm3 |
|------------------------|------------------------|-----------------|------------------|------------------------|----------------|
| Polyurethane (PU) | 20-45 | -60...+100 | 50A-70D | 25-60 | 1.05-1.25 |
| Rubber NBR | 80-150 | -30...100 | 40A-90A | 10-25 | 1-1.3 |
| Rubber SBR | 100-200 | -40...80 | 40A-80A | 8-20 | 0.94-1.1 |
| Natural Rubber (NR) | 60-130 | -50...70 | 30A-80A | 20-30 | 0.92-1 |
| Structural Steel |, | -40...500 |, | 370-700 | 7.7-7.9 |

Explanation: Polyurethane has an abrasion of 20-45 mm3 according to DIN 53516, while standard SBR rubber has 100-200 mm3. This means a polyurethane scraper lasts 3-5 times longer than a rubber one under the same conditions, with an overall lifespan 10 times greater than rubber. Steel scrapers have extremely high strength but do not absorb impacts, quickly wear out the lining, and can damage the drum, especially when used with modern abrasive mixes.

A polyurethane blade is lighter than steel (density 1.05-1.25 g/cm3 versus 7.7-7.9 g/cm3), does not add extra load on the drive, and reduces noise and vibration levels, which is important for operator comfort and the drive's longevity. Rubber loses in both wear resistance (80-200 mm3) and shape stability under load.

## How Polyurethane Scrapers Are Manufactured and Installed
Polyurethane scrapers for concrete mixers are made using the free casting method: liquid polyurethane is poured into a mold that precisely replicates the geometry of the standard part or customer's custom design. This allows for the production of both standard blades and products with non-standard shapes, holes, or bolt/keyway fittings.

The finished scraper is easily mounted in place of the standard steel or rubber blade, usually with bolt fastening to the holder or shaft. Importantly, the mass of the polyurethane part is less than that of steel, so the dynamic characteristics of the unit do not change. When replacing an old part, simply unscrew the fasteners, install the polyurethane scraper, and tighten the bolts. No additional fitting is needed, as the part is made to exact size.

Maintenance of polyurethane scrapers is minimal: periodically check the blade's condition for excessive wear or mechanical damage (e.g., if foreign objects enter the mixer). If replacement is necessary, the process takes minimal time and does not require special tools.

## How to Choose and Order a Polyurethane Scraper for Your Needs
Selecting a scraper begins with analyzing operating conditions: mixer type, filler type and fraction, operating mode, and cycle frequency. Based on this data, TIMOL engineers select the optimal polyurethane hardness (80-95 Shore A for abrasive units), part thickness, edge shape, and fastening option. The finished product is manufactured according to the customer's drawing, sketch, or sample.

It's important to note that polyurethane scrapers can be made entirely of polyurethane or with metal reinforcement for increased rigidity at the attachment point. To order, simply provide a drawing or sample, describe the operating mode, and specify service life preferences. TIMOL factory handles both single orders and batches for large production lines.

For more details on the range, see the [concrete mixer scrapers catalog](/katalog), and for material features, visit the [Reference Information](/informatsiya) section. For any inquiries, contact us through the form on the [Contacts](/contacts) page.

## Polyurethane in Mechanical Engineering: Other Applications
Polyurethane is a versatile material in mechanical and automotive engineering. Besides concrete mixer scrapers, it is used for bushings, rollers, seals, wheels, gaskets, and other parts operating under harsh conditions: high loads, abrasives, and aggressive environments. The material retains its properties in temperatures ranging from -60 to +100 °C, allowing its use in various climate zones and industries.

It is valued for its combination of high wear resistance, flexibility, dimensional stability, and low weight. Polyurethane parts do not age quickly, withstand temperature fluctuations, do not crack in frost, and maintain elasticity under load. Learn more about polyurethane applications in the [Mechanical and Automotive Engineering](/galuzi/mashinostroenie_i_avtomobilestroeniye) section.

## Conclusion: Polyurethane Scraper, a Step Towards Continuous Mixer Operation
TIMOL polyurethane concrete mixer scrapers are the solution for companies aiming to minimize downtime, reduce maintenance costs, and improve the quality of finished concrete. You receive a part with optimal hardness, tailored to your mixer model, with a lifespan 10 times that of standard rubber. Contact TIMOL for consultation, design-based calculations, and scraper orders: [contacts and catalog](/contacts).