What is the service life of polyurethane roller lining compared to rubber?

Cast polyurethane abrades at 38-39 mm³ (DIN 53516); SBR rubber at 100-200 mm³ under the same conditions. In practice this translates to a three- to tenfold increase in lining life in abrasive conveyors, mills, and transfer chutes. Exact multiplier depends on material granulometry, belt speed, and moisture content.

Can polyurethane lining be applied to an existing metal roller core?

Yes. The steel core is abrasive-blasted, degreased, and primed; liquid polyurethane is then free-cast around the core and cured. This approach allows worn rollers to be re-lined without replacing the core, reducing downtime and material costs compared to full roller replacement.

Why is polyurethane preferred over polyamide for impact-loaded rollers?

Polyamide has a rebound elasticity of 5-15%, making it brittle under lateral or radial impact. Polyurethane rebounds at 34-61%, absorbing the blow elastically. In belt-feeder and drop-zone applications, this difference prevents surface cracking that would expose the steel core to direct abrasion.

What roller diameters and lining thicknesses does TIMOL produce?

TIMOL produces polyurethane roller lining on cores from 50 mm to 600 mm in diameter. Standard lining thickness ranges from 10 mm to 80 mm. Non-standard dimensions are available by drawing. Thickness and compound hardness are specified together to optimize wear life for the actual loading conditions.

How long does roller re-lining take?

Lead time depends on roller size, lining thickness, and current production load. Single-roller orders are typically completed within a few days after confirming the drawing. Batch orders require additional scheduling. Contact the TIMOL team via the contacts page for a firm quote and timeline.

Polyurethane Roller Lining: Why It Lasts 10× Longer Than Rubber

A rubber-lined conveyor roller in a mining application can last two to four weeks before its lining wears through and the steel core starts damaging the belt. The same roller diameter lined with cast polyurethane by TIMOL runs 2 to 5 times longer under identical conditions — without the edge chipping, surface cracking or mid-shift replacement windows that cost the most in lost production time.

Why Polyurethane Roller Lining Outperforms Rubber

The fundamental reason is abrasion resistance per DIN 53516. Cast polyurethane abrades at 38-39 mm³; SBR rubber at 100-200 mm³. In a dry abrasive application the polyurethane lining loses material 2 to 5 times more slowly.

Beyond abrasion, rubber loses its elastic recovery when cyclic impact damage accumulates in the surface layer. Polyurethane rebounds at 34-61% and maintains this property throughout its wear life because the elastic network is molecular rather than macro-structural. Rubber’s rebound of 25-50% degrades progressively as fatigue microcracks propagate.

Comparison Table: Polyurethane vs. Alternative Roller Lining Materials

Material	DIN 53516 abrasion, mm³	Working temp, °C	Hardness	Tensile strength, MPa	Rebound elasticity, %	Density, g/cm³
Cast polyurethane (TIMOL)	38-39	-60…+100	85A-95A	39-87	34-61	1.05-1.25
Rubber SBR	100-200	-40…+80	40A - 80A	8-20	25-50	0.94-1.10
Rubber NBR	80-150	-30…+100	40A - 90A	10-25	20-45	1.00-1.30
Polyamide PA6/PA66	30-90	-40…+100	75D - 85D	60-85	5-15	1.13-1.15
Carbon steel (unlined)	—	-40…+500	120-250 HB	370-700	—	7.70-7.90

Engineer’s note: polyamide looks competitive on abrasion (30-90 mm³) but its 5-15% rebound makes it brittle under the radial impact that conveyor rollers routinely experience at loading points. A polyurethane liner at 80-95 Shore A absorbs the same impact elastically; a polyamide roller develops micro-cracks at the crown that propagate inward across the bearing zone. The practical result: polyamide rollers crack at loading points, polyurethane rollers wear evenly.

Roller Lining Manufacturing Process at TIMOL

Core inspection and preparation. The steel core is checked for concentricity and surface condition. Worn or corroded areas are repaired before lining.
Abrasive blasting. The core surface is blasted to Sa 2.5 (near white metal) to maximise adhesive bonding.
Degreasing and priming. Chemical degreasing removes residual contamination; bonding primer is applied and allowed to activate.
Free-cast moulding. Liquid polyurethane is poured into a mould around the prepared core at atmospheric pressure. Wall thickness from 10 mm to 80 mm; profiled surfaces (grooves, crowns, flanges) are moulded simultaneously.
Controlled curing. The assembly is held at process temperature until full through-cure is achieved. Adhesion strength exceeds the tensile strength of the polyurethane compound itself.
Finishing and inspection. The liner is turned on a lathe to final diameter and checked for concentricity, adhesion and hardness.

Applications Across 12 Industries

Polyurethane-lined rollers are used across 12 industries: mining and ore processing (conveyor drive and return rolls, impact rollers), metallurgy (coiler and tension rolls, descaling equipment), mechanical engineering (feed rollers, press rolls), oil and gas, rail transport, agriculture, ports and bulk handling, pulp and paper, food processing, printing, tube mills and light industry.

Roller lining hardness is adapted to the duty: 55-70 Shore A for impact-zone cushioning, 80-95 Shore A for high-abrasion sliding contact. See the full product range in the polyurethane catalog and related services on the services page.

How to Order Roller Lining from TIMOL

Provide roller dimensions (core diameter, overall length, lining thickness required), operating conditions (material being conveyed, belt speed, loading zone or return run) and required hardness if known. TIMOL engineers will confirm compound selection and quote production time. Submit a request via the TIMOL contacts page.