Polizene vs Steel: a guide to engineering plastics.

In the field of mechanical design and industrial plant engineering, the choice of materials for sliding guides, profiles, and contact components represents a critical factor. For decades, carbon or stainless steel has been the absolute benchmark. Today, the evolution of engineering plastics offers alternatives with superior performance in specific applications.

The comparison between POLIZENE^® ultra-high molecular weight polyethylene and steel is not a simple endurance challenge, but an analysis of the overall efficiency of the transmission and conveyor system.

For technical and purchasing departments, understanding when engineering plastic "wins" over metal means optimizing plant performance and, at the same time, cutting operating costs.

Key features of POLIZENE^®: why challenge steel?
POLIZENE^® is not a common polymer. It is a high-density, ultra-high molecular weight polyethylene. This molecular structure embeds physical and chemical properties that steel cannot replicate:
 

• Friction coefficient and self-lubrication.
  Unlike steel, which requires constant lubrication to prevent seizing and reduce sliding friction, POLIZENE^® possesses an extremely low coefficient of static and dynamic friction. It is a self-lubricating material: this eliminates the need for chemical maintenance and drastically reduces the driving force required for movement.
   
• Wear and abrasion resistance.
  In the presence of abrasive elements or the continuous sliding of steel chains, POLIZENE^® demonstrates exceptional wear resistance, often superior to that of steel itself. The polymer "absorbs" the stress without chipping or wearing out prematurely.
   
• Chemical and corrosion resistance.
  Unless treated or unless expensive AISI 304 or 316 stainless steel is used, steel is subject to oxidation and attack by chemical agents, acids, and aggressive industrial washdowns. POLIZENE^® is totally inert to corrosion, does not absorb moisture, and is suitable for direct food contact (FDA and EU 10/2011 regulations).
   
• Machinability.
  Easy and fast to machine, it requires short delivery times and offers flexibility in customized geometries such as curves or special profiles.

The Technical Department's perspective.
When should you opt for POLIZENE^® components? The main operating conditions include:

• Conveyor and bottling systems. 
  Where the presence of water, washing liquids, or acids would destroy common steel or require unsustainable maintenance.
   
• Sliding guides for roller chains. 
  Pairing a steel chain with a POLIZENE^® guide ensures that wear is concentrated on the plastic profile (easily replaceable and inexpensive) rather than on the chain, preserving the heart of the transmission system.
   
• High-speed lines. 
  Where noise reduction and the need to dissipate impact energy are fundamental requirements for acoustic comfort and component protection.

The Purchasing Department's perspective
While steel may seem like a traditional and safe choice, the Purchasing Department must evaluate the component's total life cycle cost. POLIZENE^® wins economically on several fronts:

• Reduction of maintenance costs.
  Fewer machine downtimes due to lubrication or failure caused by corrosion.
   
• Energy Savings. 
  Thanks to lower friction and the reduced weight of the components, the energy required by electric motors decreases, positively impacting the plant's energy bills.
   
• Chain preservation. 
  Industrial chains are expensive. Running them on POLIZENE^® profiles extends the service life of the chain itself, optimizing investments in spare parts.

With Francia Srl, a perfect synergy.
By this article, we do not mean to eliminate steel from the factory, but rather to place the right material in the right place. The ideal mechanical combination often sees steel as the main actor for strength (transmission and conveyor chains) and POLIZENE^® as the perfect partner for motion management (guides, curves, profiles).

Francia SRL, leveraging its experience in providing industrial transmission solutions, supports its customers both in choosing the best steel chains and in designing and supplying POLIZENE^® profiles.
 

Read also:
Metal profiles, POLIZENE^® inserts: a perfect combination ››
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Contact us for any request or advice.
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