When specifying valves for mining slurry, the elastomer used inside the valve can have a major effect on service life.
Two materials frequently considered for abrasive applications are rubber and polyurethane (PU).
But which one should be used?
The answer depends on the slurry.
Why Does the Lining Matter?
In an abrasive slurry pipeline, solid particles continuously interact with the valve’s wetted components.
The wrong material can result in:
- Premature wear
- Leakage
- Loss of sealing performance
- Increased maintenance
- Unplanned shutdowns
The lining therefore needs to be selected according to the actual operating conditions.
Rubber in Slurry Applications
Rubber has long been used in slurry-handling equipment.
It can provide excellent resistance to many types of abrasive media and offers flexibility that can be advantageous in slurry applications.
However, rubber performance depends heavily on the specific compound and operating conditions.
Polyurethane for Abrasive Service
Polyurethane is known for its abrasion and impact resistance.
This can make PU particularly attractive where slurry contains sharp or highly abrasive particles and where particle impact is significant.
CMO Africa’s XB Series uses polyurethane lining for demanding slurry, wastewater and industrial applications containing solids.
So Which One Is Better?
There is no universal winner.
Polyurethane may be advantageous when:
- Abrasion is severe
- Particle impact is significant
- Sharp solids are present
- Higher wear resistance is required
Rubber may be suitable when:
- The slurry characteristics favour elastomer flexibility
- Chemical compatibility is important
- The application falls within the material’s recommended service conditions
Don’t Select the Material by Name Alone
“PU” or “rubber” does not automatically tell you whether a valve will work.
Engineers should evaluate:
- Particle size
- Particle hardness
- Velocity
- Temperature
- pH
- Chemical composition
- Solids concentration
The correct elastomer is the one that matches the complete duty.
Conclusion
Choosing between polyurethane and rubber should be an engineering decision rather than a simple product preference.
For demanding African mining applications, CMO Africa can help match the valve construction and elastomer selection to the actual process conditions.
FAQs
Is polyurethane more abrasion resistant than rubber?
Polyurethane can provide excellent abrasion and impact resistance, but suitability depends on the specific slurry and operating conditions.
Are polyurethane-lined valves suitable for mining?
Yes. PU-lined valve designs can be used for abrasive mining slurries where the material is appropriate for the process.
What information is needed to select a slurry lining?
Provide slurry composition, particle size, density, temperature, pH and operating velocity where available.