---
title: "Polyurethane Elevator Buckets for the Pulp and Paper Industry: Advantages and Comparison"
description: "In-depth analysis of polyurethane elevator buckets for the pulp and paper industry. Why does polyurethane outperform rubber and steel? Request a custom design quote at TIMOL."
lang: "en"
date: "2026-08-18"
canonical_url: "https://timol.com.ua/en/statti/shneki-pogruzochnye-dlya-bymajnaya-promyshlennost"
---
# Polyurethane Elevator Buckets for the Pulp and Paper Industry: Advantages and Comparison

In pulp and paper production, the main headache is the wear of elevator components: buckets are pierced by abrasives, metal rusts, and rubber is "eaten away" in a matter of months. Every emergency elevator shutdown means lost production and unforeseen expenses. Polyurethane buckets solve this problem: in this article, we will explore why they perform better, which components should be replaced, and what to expect from the replacement.

## Why Polyurethane is the Optimal Material for Elevator Buckets in the Pulp and Paper Industry
Polyurethane elevator buckets last 10 times longer than rubber counterparts and significantly outperform steel in resistance to hydroabrasive wear. When transporting wood chips, wet pulp, or limestone, buckets are in constant contact with abrasive materials and subject to impacts from foreign objects. Polyurethane, with its resilience (rebound elasticity of 35-65%), absorbs the energy of the abrasive, preventing it from penetrating the bucket's thickness, and withstands short-term impact overloads.

The working temperature range of polyurethane from -60 to +100 °C allows for worry-free operation in both winter and when handling hot flows. Another key advantage is the absence of corrosion: buckets do not form rust deposits, do not contaminate the product, and do not require regular anti-corrosion treatment. While SBR rubber has an abrasion of 100-200 mm3 (DIN 53516), polyurethane's abrasion is only 20-45 mm3, offering a lifespan 4-10 times greater than even the best rubber solutions.

Using polyurethane in components with high moisture and reagent content is also justified due to its resistance to aggressive environments, which are common in paper production. The material does not swell, does not absorb moisture, and retains its strength even during prolonged use in challenging conditions.

## Which Components and Parts Should Be Replaced with Polyurethane
First and foremost, polyurethane elevator buckets should be installed on elevators transporting not only wood chips but also limestone, crushing waste, ash, chalk, and other bulk and semi-moist mixtures. These lines experience the most wear, especially in areas where rubber lasts only a few months and metal constantly suffers from moisture and corrosion.

It is also advisable to replace scrapers, chute linings, seals, and gaskets, as they also operate in contact with moist fibers, abrasives, and chemically active reagents. Switching these elements to polyurethane (considering the hard part of the Shore A range for abrasive areas, 80-95 Shore A) minimizes unplanned downtime and reduces the frequency of emergency repairs.

Importantly, polyurethane buckets can be manufactured for any standard or custom mounting, with bolt holes or other fixation options. This simplifies the implementation of upgrades even in old elevator lines without complex body modifications.

> **Engineering Tip:** For elevator buckets working with abrasive materials, choose polyurethane with a hardness of 80-95 Shore A. This is the optimal balance between resilience and wear resistance. The bucket wall thickness should match the load characteristics and elevator speed. Proper preparation of seating holes and correct fastening are critical for unit safety.

## Comparative Table: Polyurethane, Rubber, Steel

| Property | Polyurethane (TIMOL) | SBR Rubber | Carbon Steel |
|------------------------------|----------------------|--------------------------|--------------------------|
| Abrasion Resistance (DIN 53516) | 20-45 mm3 | 100-200 mm3 |, |
| Wear Resistance vs Rubber | 10 times higher |, |, |
| Working Temperature | -60...+100 °C | -40...80 °C | -40...500 °C |
| Density | 1.05-1.25 g/cm3 | 0.94-1.1 g/cm3 | 7.7-7.9 g/cm3 |
| Tensile Strength | 25-60 MPa | 8-20 MPa | 370-700 MPa |
| Hardness | 50 Shore A-70 Shore D| 40A-80A | 120-250 HB |
| Rebound Elasticity | 35-65% | 30-55% |, |
| Corrosion Resistance | High | Medium | Low |
| Weight | Light | Light | Heavy |
| Noise Level | Low | Low | High |

## How Polyurethane Affects the Durability and Maintenance of Elevator Components
Replacing elevator buckets with polyurethane ones significantly extends the maintenance interval. Resilient polyurethane does not crack upon impact; even if a foreign object enters the flow, the bucket does not shatter but only deforms and returns to shape. Due to its low density (1.05-1.25 g/cm3), a polyurethane bucket is about 7 times lighter than a steel one, reducing the load on traction organs, gearboxes, and bearings, thus extending the lifespan of the entire unit.

Another advantage is uniform wear across the working surface. Unlike steel, which can "chip," polyurethane gradually wears down without forming sharp edges and does not break suddenly. This allows for scheduled component replacement rather than waiting for an emergency. Additionally, polyurethane does not affect product quality, as no rusty particles or scale enter the flow, unlike with metal buckets.

Prolonged use in aggressive environments (alkaline, acidic, moist pulps) also does not lead to a loss of strength or elasticity. This is especially valuable for pulp and paper enterprises, where raw material and reagent composition changes occur frequently.

## Features of Manufacturing and Selecting Polyurethane Buckets
Polyurethane elevator buckets are manufactured by the free casting method, allowing for parts with complex shapes, reinforced zones, and varying wall thicknesses. Standard profiles are used for typical elevators, but in practice, a product may often be needed according to customer drawings or considering the geometry of existing seating places.

Choosing the hardness is a critical moment: for abrasive and moist environments, it is advisable to choose 80-95 Shore A, which provides the optimal compromise between resilience and abrasion resistance. Too hard (Shore D) polyurethanes are not suitable for abrasives, as they lose the ability to absorb impacts, while too soft ones wear out faster. For components operating under pressure or where geometric stability is important, harder grades up to 70 Shore D may be selected.

In the production process, it is important to properly organize the preparation of seating surfaces to ensure precise fit and avoid misalignment. Quality fastening is the key to unit safety and longevity. TIMOL manufactures elevator buckets both in standard sizes and according to drawings/samples, allowing for the implementation of polyurethane in any existing line without complex structural changes.

## Installation, Maintenance, and Repairability of Polyurethane Buckets
Installing polyurethane buckets does not require elevator modification: installation is carried out on standard seating places using typical fasteners. To replace, simply remove the old bucket, clean the seating area, check bolt integrity, and install the new product. Thanks to precise geometry and high elasticity, installation is quick, without adjustments.

Maintenance involves regular visual inspection of wear and checking fasteners. Most damage is gradual, allowing for planned replacement. A special advantage of polyurethane is repairability: in case of local damage, the part can be replaced separately without disassembling the entire line. If necessary, the factory will produce a new product according to the customer's sample or drawing.

Learn more about polyurethane casting technology and material properties in the [reference information](/informatsiya) section, as well as in the [“Pulp and Paper Industry”](/galuzi/bymajnaya_promyshlennost) section.

## Practical Effect of Implementing Polyurethane Buckets in the Pulp and Paper Industry
The introduction of polyurethane elevator buckets allows pulp and paper industry enterprises to reduce the number of emergency stops, lower spare parts costs, and increase the overall reliability of elevator components. Reducing the weight of parts decreases the load on electric drives, bearings, and traction organs, while high wear resistance (20-45 mm3 according to DIN 53516) ensures stable performance in challenging operating conditions.

The enterprise gains predictable elevator operation, uniform wear without sudden failures, and a simple ordering mechanism, requiring only a drawing or sample of the part. All logistics are organized without intermediaries, and technologists will help select the optimal hardness and bucket design specifically for your conditions.

For consultation, calculation, or ordering polyurethane elevator buckets, contact the TIMOL factory through the [catalog](/katalog) or [contacts](/contacts) page. We will select a solution for your line and ensure long-term equipment operation.