There are many benefits to rubber lining your products which include wearing life, corrosion resistance, vibration dampening, and noise reduction. This is great for when alloy products keep wearing in the same spot. This generally leads to continuous welding in the same location. Instead of welding metal patches again and again rubber can be used to increase the wear life of the product.
Link to Xiangyi
Ceramic lining can be used to increase wear life and is generally better than rubber but has a few disadvantages. Ceramic is susceptible to cracking and falling out of place before wearing out. Lining in ceramic is much more expensive, and the tiles can fail due to insufficient grout between them.
There or several questions that must be answered before selecting the correct rubber hose type. These questions consist of solid types, wet/dry-percent solids, particle size, velocity (including how far particles drop). Temperature, chemicals, angle of impact, and UV exposure.
The better the customer can answer these questions to the supplier the easier it will be for them to suggest the correct rubber type. Popular rubber types are tan gum, neoprene, chlorobutyl, and SBR.
Rubber applications that can be lined are pipes, elbows, chutes, hoppers, tubs, launders, troughs, feeders, agitator blades, pulley lagging, distributors, and transition points.
This natural rubber is soft with a durometer range of 35-65. Tan gum’s unique properties are high abrasion resistance, tear resistance, flexibility, tensile strength, friction, and rebound. Unfortunately, this rubber is bad for UV aging, ozone resistance, oil, and gasoline.
Applications that tan gum is great for are fine sand slurries, sliding abrasion, wet applications, and temperatures ranging from -40°f to 160°f. Tan gum is great when custom pipes have unique bends and flanges.
This rubber is not recommended for large particle sizes, sharp particles, oils, dry applications, UV exposure, and most hydrocarbons.
Neoprene/Chloroprene has an approximate durometer of 60 and is one of the oldest synthetic rubbers. This Rubber is a good option overall and has great resistance to corrosion and degradation. Neoprene is a good choice when dealing with abrasion, tearing, flexibility, rebound, UV aging, ozone resistance, oil, and gasoline.
Applications for Neoprene are when wear resistance is needed (especially in presence of some oils), UV Resistance, Oils, and Temperature ranges up to 225°f are present. Also is great for parts that are experiencing corrosion.
The only application that Neoprene is not recommended for is when wear resistance is important with the presence of oils.
Chlorobutyl or Butyl has an approximate durometer of 60. This rubber excels in abrasion resistance and ozone resistance. It does well in flexibility, UV aging, and rebound(hot). Chlorobutyl lacks when it comes to rebound(cold), oil, and gasoline.
The applications that Chlorobutyl is recommended when UV resistance, chemical resistance, and temperatures up to 250°f are important. This is a great rubber for when anything needs to be air-tight.
Chlorobutyl is not recommended for applications when wear resistance is important, and when oils are present. Natural Rubber is a better wear-resistant rubber than chlorobutyl.
Styrene-Butadiene Rubber (SBR) is a synthetic black rubber with an approximate durometer of 55. SBR’s is good for tear resistance, abrasion resistance, flexibility, and rebound. The chemical properties on the other hand UV aging, ozone resistance, acid resistance, oil, gasoline, and hydrocarbons are all poor.
Applications that SBR would be good for are large particle sizes, sharp objects, wet applications, dry applications, and when temperatures range from -40°f to160°f. This rubber outperforms natural rubber when dealing with large sharp objects.
Contact us to discuss your requirements of Rubber Component for Pumps. Our experienced sales team can help you identify the options that best suit your needs.
SBR is not recommended for oils and UV (sunlight aging) applications. This rubber has similar applications and properties as black gum rubber.
Another alternative to lining mining equipment is to choose urethane. Urethane in general offers better strength, toughness, durability, and versatility than rubber. Polyurethanes can be easily altered chemically to fit specific needs.
Rubbers on the other hand are very strong, withstand more stress, can have less wear, are nonconductive, and most importantly more affordable.
When it comes to choosing the correct rubber or other lining material, Townley can help select the right material with our experienced customer service team. With over 50 years of experience solving wear issues in the mining, power, and dredging industries Townley can solve almost any wear problem. Reach out to us via contact form or call 1-800-342-.
What are the physical properties of rubber?
These are the physical properties of rubber.
The following sections provide a high-level look at each physical property. Future articles in this series will examine each property in greater detail.
Elastomers have an inherent hardness because of their chemical structure. This hardness can be modified, and the processed hardness then measured in terms of durometer (duro) on a Shore scale. For soft to medium-hard rubber, Shore A is used. At 40 duro, solid rubber profiles have the consistency of pencil erasers. At 90 duro, they’re hard like hockey pucks. Which hardness do you need?
Tensile strength (TS) is the amount of force that’s required to pull a rubber specimen apart until it breaks. Known also as ultimate tensile strength (UTS), TS is measured in either pounds per square inch (psi) or megapascals according to ASTM D412. For technical buyers and part designers, tensile strength matters because it represents a rubber’s point of failure caused by stretching.
Tensile modulus (TM) sounds similar to tensile strength, but these two properties are not the same. TM is the force or stress that’s required to produce an elongation percentage or strain in a rubber sample. In general, harder rubber has a higher tensile modulus. Such rubber is more resilient, but also more resistant to extrusion, a process for manufacturing stock materials used in custom fabrication.
Elongation is the percentage increase (strain) in the original length of a rubber sample where a tensile force (stress) is applied. Some elastomers stretch more than others. For example, natural rubber (NR) may stretch up to 700% before reaching its ultimate elongation, the moment the NR breaks. By contrast, fluoroelastomers may rupture at 300% elongation. How much do you need your rubber parts to stretch?
Resilience or rebound refers to a rubber’s ability to regain its original shape and size after a temporary deformation, such as contact with a metal surface. Resilience is especially important in dynamic seals, components that create a barrier between moving and stationary surfaces. If your application requires weatherstripping between a door and a door frame, the compound’s resilience is important to consider.
Compression set is the amount by which an elastomer fails to return to its original thickness after a compressive load is released. When a rubber seal is compressed repeatedly over time, progressive stress relaxation occurs. In terms of the seal’s life, stress relaxation is like dying. Compression set is like death itself – the end result of a steady decline in sealing force. How long do you need your seal to last?
Tear resistance describes an elastomer’s resistance to the growth of a nick or cut when tension is applied. Also known as tear strength, this physical property is measured in either pound force per inch (lbf/in) or kilonewtons per meter (kN/m). If you need edge trim that will contact rough metal edges or sharp objects, consider tear resistance during compound selection.
Abrasion resistance describes a rubber’s resistance to being worn away from rubbing or scraping. In industrial applications, abrasion-resistant rubber is used with conveyor belts that move coal and in pumps that handle slurries. Material loss due to abrasion can be measured with various instruments according to tests such as ASTM D394.
Specific gravity is the ratio of the weight of a material to the weight of an equal volume of water at a specified temperature. For chemists, it provides a way to identify compounds. For technical buyers and part designers, it’s important to know that rubber with a low specific gravity offers more square inches per pound of stock. Rubber with a higher specific gravity provides advantages in molding consistency.
If you want to learn more, please visit our website Conveyor Belt.