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How to choose rubber for slurry applications.

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There are many factors when choosing the right rubber compound for a slurry application.

The first things to consider is the makeup of the slurry.

Is it Acidic or Alkaline? Some rubbers are better for chemical resistance like Chlorobutyls and Bromobutyls but Natural Rubber is better for Hydrochloric Acid

Are there hydrocarbons present? If so then your best bet is Neoprene.

Is it a high temperature? If so your back to Chlorobutyls and Bromobutyls.

Particle sharpness? When you have very sharp particles you want a higher durometer to resist a cut and chip application. Going from a 40 Duro to a 60 Duro gives the rubber a better chance against sharp particles.

The second thing to consider is the design of the pipe tank or chute you need to line.

What are the velocities? The erosion rate of a the liner is direct relation to the increase of velocity. If the slurry moves to fast and  the material is large like 3/4″ minus. Rubber may not even be the proper lining material. In this circumstance a more epensive liner will perform better such as ceramic or chromium carbide.

Are the bend radius and angles good? The biggest problem you can have on a chute, pipe, bin that is lined is the angle the material is hitting the liner.  If the angle is too acute the liner will wear extremely quickly, there are tricks for this you can have the material hit itself using dead bed techniques. Or you can change the angel for example specify a large radius in a bend.

 

So what is the best general liner? Wet sliding abrasion in ambient temperature with velocities that are more or less reasonable with no chemicals that can swell or attack the rubber. Line with than 40 duro natural rubber. For any size of pipe 8″ and below 1/4″ is fine anything above you can use 1/2″.

 

What about thicker liners?

Thicker liners do not mean better performance or longer lasting liners for that matter.  You can pile two inches of rubber in the bottom of a chute. The lining application will be problematic and if erosion start in a spot because of the reasons listed above you are no better off.

 

 

 

 

Dan Chamberland

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