HDPE and GRHDPE Composite Conveyor Rollers

Why steel rollers keep creating maintenance work on certain sites

Steel conveyor rollers are the default across most bulk handling applications, and on many sites they’re the right choice. But on sites where corrosion, noise, or material adhesion are persistent problems, steel rollers generate a maintenance cycle that compounds. Surface treatment degrades, corrosion sets in, rollers seize or fail early, and replacement frequency climbs. In highly corrosive environments, some sites are replacing steel rollers on an 18–24 month cycle.

To address this, DYNA Engineering began manufacturing HDPE rollers in 2018, and more recently introduced HDPE Composite rollers to extend those benefits into heavier-duty applications.

What changes with HDPE rollers

Plain HDPE rollers use a high-density polyethylene tube in place of steel, with an HDPE bearing housing, outer seal, rubber cover, and multiple labyrinth seals for protection against dust and moisture ingress.

The most significant practical difference is the elimination of surface treatment maintenance. HDPE doesn’t rust, doesn’t need painting, and isn’t susceptible to the corrosion damage that shortens steel roller service life in wet or chemically aggressive environments.

Noise is the other notable change. HDPE rollers run up to 10dB quieter than steel. On sites where conveyors operate near residential areas or run continuously through the night, that reduction matters operationally,  in some cases it affects whether a new land-traversing conveyor can get planning approval at all.

HDPE also reduces material adhesion to the roller surface compared to steel, and is non-magnetic and non-conductive, which makes it suitable for use in metal detector and magnet zones where steel rollers would interfere. HDPE options are currently available on plain rollers.

HDPE Composite rollers: what they add

HDPE Composite rollers (also referred to as GRHDPE or glass fibre reinforced HDPE) use a composite tube and composite bearing housing, with a multiple labyrinth seal arrangement designed for more demanding operating conditions.

The glass fibre reinforcement addresses the load and wear demands that can limit plain HDPE in high-duty applications. HDPE Composite rollers carry the same noise, corrosion, and adhesion advantages as plain HDPE, while extending performance in wet conditions and improving service life under sustained heavy loading, making them suitable where plain HDPE would be under-specified.

DYNA Engineering trialled HDPE Composite rollers in the Pilbara on a major mining project. “The Pilbara is a harsh and testing region of the world, but due to our extensive quality systems and experience in design manufacturing conveyor equipment, we know they are built to last in such trying conditions,” DYNA Engineering general manager Thomas Greaves said.

The trial was successful and HDPE Composite rollers are now in full production.

Which roller type suits which application

Steel rollers remain the appropriate choice across most standard applications, particularly where load requirements are high and corrosion or noise aren’t primary concerns. Stainless steel options (304SS, 316SS, 316L) are available for applications requiring greater corrosion resistance or non-magnetic design.

Plain HDPE rollers suit light to medium duty applications where corrosion, noise, or non-magnetic operation are the driving requirements.

HDPE Composite rollers extend those benefits to higher-duty and wet environments, mining, mineral processing, and long-distance conveying where steel creates ongoing surface treatment costs and plain HDPE may not have sufficient load capacity.

All roller types are customisable to suit bearing brand, bearing size or series, and project standards and specifications.

Result – Roller options matched to site conditions

DYNA Engineering’s roller range now includes steel, stainless steel, aluminium, HDPE, and HDPE Composite shells, across roller types including plain, impact, rubber coated, rubber screw, steel screw, and rubber disc. Custom sizes are available on request. Idler frames are available in a range of configurations, inline trough, offset trough, return, trough trainer, return trainer, transition, and others in standard painted, galvanised, or project-specific finishes.

Frequently Asked Questions

What is the difference between HDPE and HDPE Composite conveyor rollers?

Plain HDPE rollers use a high-density polyethylene tube and are suited to light to medium duty applications. HDPE Composite rollers incorporate glass fibre reinforcement, which improves load capacity and performance in wet or high-duty conditions, making them suitable for applications where plain HDPE would be under-specified.

Are HDPE rollers quieter than steel conveyor rollers?

Yes. HDPE rollers run up to 10dB quieter than steel. This is relevant on sites where conveyors operate near residential areas or run continuously at night, and in some cases has influenced whether a new conveyor installation can receive planning approval.

Do HDPE rollers require surface treatment or repainting?

No. Unlike steel rollers, HDPE rollers don’t rust, corrode, or require surface treatment. This eliminates the maintenance cost and shutdown time associated with repainting or corrosion management, which can be significant in wet or chemically aggressive environments.

Can HDPE rollers be used in metal detector or magnet zones?

Yes. HDPE is non-metallic and non-conductive, making it compatible with metal detector and magnet installations where steel rollers would cause interference.

What roller types are available in HDPE or HDPE Composite from DYNA Engineering?

HDPE options are currently available on plain rollers. The full DYNA roller range, including impact, rubber coated, rubber screw, steel screw, and rubber disc is available in steel and stainless steel. All rollers can be customised to suit bearing brand, size, series, and project specifications.

Have HDPE Composite rollers been tested in harsh mining conditions?

Yes. DYNA Engineering successfully trialled HDPE Composite rollers on a major mining project in WA’s Pilbara region, one of the most demanding environments for conveyor equipment. HDPE Composite rollers are now in full production.