---
title: "Scrapers for Conveyor Belt Cleaning: TIMOL Polyurethane vs. Rubber and Steel"
description: "Compare TIMOL polyurethane scrapers with standard rubber and steel. In-depth analysis of wear resistance and conveyor node selection. Contact us for a quote."
lang: "en"
date: "2026-09-15"
canonical_url: "https://timol.com.ua/en/statti/skrebki-dlya-ochyshchennya-konveyernykh-strichok-i-barabaniv"
---
# Scrapers for Conveyor Belt Cleaning: TIMOL Polyurethane vs. Rubber and Steel

Another downtime due to a worn scraper on the belt or drum is a familiar scenario for many workshops. Rubber and metal blades, which need to be replaced monthly, become a critical point for productivity. Cast polyurethane offers a service life 10 times longer, ensuring stable operation even in the most aggressive nodes. In this article, we will explore the physics of wear, nuances of hardness selection, installation, and manufacturing of polyurethane scrapers for industrial conveyors.

## What Problems Do Polyurethane Scrapers Solve on Conveyors?
Polyurethane scrapers for cleaning belts and drums address three main issues: removing adhered material, reducing abrasive wear, and maintaining continuous line operation. They are installed at the first and second levels of cleaning, directly after material discharge and before drive drums. Thanks to the elasticity of polyurethane, the scraper presses tightly against the belt without damaging it, effectively removing residual raw materials, dust, sludge, or clay.

Compared to rubber or steel, polyurethane scrapers better adapt to changes in belt shape, dampen vibrations, and leave minimal residue. This reduces maintenance frequency and the risk of belt damage. In the mining and metallurgical industries, scrapers work with heavy abrasive fractions, enduring cycles of impact, freezing, heating, and contamination with oils.

Polyurethane scrapers are mounted on spring, hinge, or rigid brackets that ensure constant pressure. The part can be quickly removed for inspection and replacement without dismantling the entire structure. For nodes with high humidity or chemical aggression, polyurethane also shows resistance, unlike metal, which corrodes, or rubber, which cracks.

## Why Is Polyurethane More Effective Than Rubber and Metal as a Scraper?
A polyurethane part surpasses rubber in wear resistance by 10 times and metal in resistance to chipping and elasticity. The elastic structure of polyurethane acts as a shock absorber: when an abrasive particle strikes, it absorbs the energy and returns it, preventing the particle from cutting through the surface. Rubber has lower resistance to abrasives due to a less dense polymer network, while steel, though hard, is not flexible, chipping under abrasives, and often causing burrs at the drum interface.

Standard rubber (SBR, NBR, EPDM) wears 2-5 times faster than polyurethane in real production conditions, as confirmed by laboratory abrasion tests according to DIN 53516. Metal scrapers create additional noise, damage the belt, and transmit impact loads to the line itself, leading to material fatigue and emergency stops. Polyurethane not only retains its shape but also protects the belt from micro-cuts and cracks.

In TIMOL's factory practice, polyurethane scrapers have shown stable performance under sharp changes in temperature, humidity, and loads, from cold storage areas to heated transport tunnels. Nodes with polyurethane scrapers require less frequent maintenance and are easier to bring to scheduled repairs.

## What Is the Optimal Hardness of Polyurethane for Scrapers?
For scrapers and wear-resistant parts, the optimal hardness range is 80-95 Shore A. This is where polyurethane retains the elasticity to absorb abrasive impacts and sufficient hardness to withstand intense abrasion. Lower hardness (below 80 Shore A) wears quickly under load, while harder grades (Shore D) lose elasticity and begin to chip, which is critical for scrapers working under load and impact.

The 80-95 Shore A range provides maximum resource for scrapers in mining, metallurgy, agriculture, food industry, and docks. In installation practice, it is important to consider the type of material being transported. For aggressive abrasives or fast belts, the upper hardness limit (90-95 Shore A) is recommended, while for fine-grained or wet materials, medium values are suitable.

> **Engineer’s Tip:** For belts with aggressive abrasives or high speed, choose a polyurethane scraper with a hardness of 90-95 Shore A. Before installation, be sure to clean and degrease the base for quality adhesion, especially if bonding or casting the scraper directly onto a metal frame.

## Comparative Table of Scraper Characteristics (PU, Rubber, Steel, Caprolon)

| Material | Abrasion (DIN 53516) | Working t, °C | Hardness | Tensile Strength, MPa | Density, g/cm³ |
|------------------------|----------------------|------------------|-----------------|------------------------|----------------|
| Polyurethane (TIMOL) | 20-45 mm3 | -60...+100 | 50A-70D | 25-60 | 1.05-1.25 |
| Rubber SBR | 100-200 mm3 | -40...80 | 40A-80A | 8-20 | 0.94-1.1 |
| Rubber NBR | 80-150 mm3 | -30...100 | 40A-90A | 10-25 | 1-1.3 |
| Rubber EPDM | 80-180 mm3 | -50...120 | 30A-90A | 7-20 | 0.86-1.1 |
| Natural Rubber | 60-130 mm3 | -50...70 | 30A-80A | 20-30 | 0.92-1 |
| Carbon Steel |, | -40...500 | 120-250 HB | 370-700 | 7.7-7.9 |
| Caprolon | 30-90 mm3 | -40...100 | 75D-85D | 60-85 | 1.13-1.15 |

The table shows that polyurethane has an abrasion of 20-45 mm3 (DIN 53516), which is 2-5 times better than the nearest polymer competitors (caprolon, NR, NBR) and 10 times better than standard rubber. Steel does not have a DIN 53516 abrasion standard, but its resource in abrasive nodes is often lower due to chipping and lack of elasticity.

## How Are Polyurethane Scrapers Manufactured: From Drawing to Installation
Scrapers for conveyor belts and drums are manufactured at the TIMOL factory using the free casting method according to customer specifications. During the design stage, engineers analyze working conditions, material type, abrasiveness, belt speed, and ambient temperature. Based on a drawing or sample, a casting mold is formed, into which polyurethane is poured in the exact geometry of the future scraper.

Often, a metal insert or frame is incorporated into the design to increase rigidity and facilitate installation. A crucial step is preparing the surface for adhesion: the metal base is sandblasted, degreased, and coated with an adhesive layer. This ensures the strength of the bond between polyurethane and metal even under dynamic loads.

The finished scraper is mounted on standard or custom fasteners that provide pressure adjustment to the belt. With proper installation, the scraper does not cut the belt, prevents adhesion, and operates within the specified temperature range. During operation, only periodic visual inspection and cleaning of the working edge are required.

## Why Do Polyurethane Scrapers Last Longer: Physics and Operation
The longevity of polyurethane scrapers is explained by their ability to absorb impact loads and resist abrasives due to their elasticity. The material does not lose elasticity in the temperature range from -60 to +100 °C, does not crack under fluctuations, and does not absorb moisture. With a high tensile strength (25-60 MPa), the part withstands stretching and deformation, and a density of 1.05-1.25 g/cm3 is optimal for easy installation without overloading the node.

Polyurethane is resistant to chemical reagents, oils, and aggressive environments, which is important for the food, pulp and paper, and oil and gas industries. Scrapers do not require complex maintenance: periodic inspection and cleaning are sufficient. When worn, the working edge can be trimmed or replaced with a new one without disassembling the entire node.

In mining and metallurgical workshops, TIMOL scrapers are often installed on nodes where rubber previously failed within 2-3 weeks, while polyurethane lasts a full season, sometimes longer. This saves maintenance time and reduces costs for emergency stops.

## Where Are Polyurethane Scrapers Used: Industries and Nodes
TIMOL polyurethane scrapers are used in 12 industries: mining, metallurgy, machinery and automotive, oil and gas, railway transport, pipe production, pulp and paper, printing, food, docks and ports, agriculture, and light industry. They clean belts in nodes transporting ore, grain, sand, cement, coal, clay, screenings, as well as food or chemical bulk materials.

In each of these industries, scrapers work on belts ranging from a few dozen centimeters to two meters wide, on drive, driven, and tension drums, as well as in nodes with gravity equipment. The part ensures belt cleanliness, protects rollers and bearings from contamination, and reduces wear on the conveyor itself. All 12 applications of polyurethane are listed in the factory's [reference information](/informatsiya).

## How to Order a TIMOL Polyurethane Scraper and Get Consultation
Selecting a polyurethane scraper for your conveyor begins with node analysis: belt type and width, speed, load characteristics, operating conditions (temperature, humidity, chemical aggression). Simply provide a drawing, sketch, or sample, and TIMOL factory engineers will manufacture the part using the free casting method with optimal hardness (80-95 Shore A) considering the specifics of the task.

Products undergo quality control, adapt to standard or custom mounts, and are equipped with a metal insert if needed. You can order polyurethane scrapers, get a resource calculation, or consultation through the [catalog](/katalog) or by contacting the factory's [contacts](/contacts). Specialists will help select the material, hardness, and geometry of the part for your conveyor.