Rubber vs Polyurethane Seals: Which Material Should You ...

Jun. 10, 2024

Rubber vs Polyurethane Seals: Which Material Should You ...

Rubber and polyurethane are two types of materials that are commonly employed in leak test seals. While there are many formulations to choose from within these two polymers, each material has its unique physical properties that can improve or weaken the performance of your leak test. To help streamline your material decisions, we will discuss these two commonly employed materials and explore which ones may be best for your application.

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What is Rubber?

Rubbers are a family of polymeric materials based on the chemistry of natural rubber latex. While there are many synthetic rubbers on the market, they share a basic chemical composition with natural rubbers. While rubber is a cost-effective solution for many applications, its physical properties often prevent superior performance, especially in extreme environments.

What is Polyurethane?

Polyurethanes are formed through the chemical reaction between a polyol and diisocyanate. Despite having a complex chemical structure, polyurethanes like thermosets can be custom formulated to meet exact design and performance requirements. As a result, polyurethanes can virtually be found anywhere in applications like medical devices, military & defense, and packaging to name a few.

Differences Between Rubber & Polyurethane

While rubber and polyurethanes may have a few similarities, there are many distinct differences between the two. As an example, the table below breaks down these variations to help discern between the two sought-after materials:

Benefits of Rubber

Benefits of Polyurethane

Different grades are available in solid form Solids or foams available at any hardness without sacrificing performance High elasticity and compression set Customizable properties to achieve exact performance requirements Some rubbers are able to withstand temperatures up to

580

°F Highly flexible in various environments, chemicals, & temperatures Rubber is biodegradable & can breakdown when not in use Longer life, especially in outdoor or extreme environments Often more cost effective for standard materials & shapes Flexibility to be custom molded into any shape or complex geometry

Which Material Should you choose?

Rubber and polyurethane seals are commonly used for their material selection and physical properties. Depending on its environmental conditions and overall function, one material is usually a better option over the other. For example, leak tests are often an excellent application for polyurethane seals as helium is typically employed during testing. Unlike rubber, polyurethanes can exhibit superior abrasion resistance, tensile strength, and tolerances to greases, oils, oxygen, and ozone. In addition, polyurethanes like thermosets can offer product engineers an endless range of customizable formulations and manufacturing capabilities to achieve complex geometries and better performance for extended wear. Because rubber is biodegradable, it tends to rot and degrade over time with exposure to certain elements - leading to potentially inaccurate test results and frequent seal replacements. For this reason, polyurethanes are often preferred for applications that require very specific physical properties for improved performance.

If you find custom leak test seals are a key requirement for improved performance, this can easily be tailored by your thermoset polyurethane manufacturer. For material assistance, complete our design tool here, or click the button below to start your custom polyurethane seal today.

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Things you should know before buying Rubber Oil Seals

If you deal with rotatory shaft equipment, you would probably be having rubber seals in your mechanical assembly. For any manufacturing company, optimal functionality, efficiency, and long service life are essential to your success in the market. A component that is majorly underappreciated within a machine assembly, would be oil seal.

Shaft seals are used to prevent lubricant leaks like oil or grease and protect machinery from dirt, dust, and water&#;which makes them invaluable to industrial operations. In this post, we will dive deeper into oil seals and discuss everything that one must know, such as what it is, how it works, types, applications, and what to keep in mind when buying oil seals.

What are rubber oil seals?

Rubber oil seals are placed between moving and static parts of mechanical equipment to prevent damage caused by moisture, contaminants, etc. Also known as rotatory shaft seals, grease seals, fluid seals, lip seals, and dirt seals; oil seals play an important role in closing the gaps between moving and stationary parts of machines.

Their main purpose is to retain or separate fluids from mixing and escaping the gauge, as well as stop moisture, abrasives, corrosive materials, and foreign contaminants from entering the parts, thereby ensuring maximum machine efficiency. Moreover, shaft rubber seals help prevent lubricant leakage at high pressure, for instance, when the machine is working at an extremely high pace.

How does rubber oil seal work?

Oil seals work by retaining lubricant in a thin layer between the lip and the shaft. These seals are attached to the bearing, with their lip pressing against the rotating shaft and the casing resting against the housing to hold the seal in place.

Oil seals perform some functions that ensure functionality at all costs and they do this by retaining lubricants at all costs and not making them escape no matter how high the pressure is. Whenever an oil seal fails, it creates seal leakage allowing abrasives, corrosive moistures and sediments to enter machines. Oil seals are especially used in equipment that has rotating, oscillating, and reciprocating shafts &#; pumps, pistons, etc.

Different types of seals offered by rubber products manufacturers in India include &#; Single and double lip oil seals, metal cased, external and internal oriented oil seals, and spring-energized oil seals and you can pick the one that best suits your industry requirements.

Applications of Oil Seals

Practically, all machine equipment including assembled machines, car engines, and PTFE machined parts use these oil seals to prevent harmful interactions that could possibly result in damaged parts. They are used in the assembly of Elevators, conveyor belts, engines, grinding mills, pipelines, wind turbines, and more.

When equipment is under high pressure, lubricants tend to escape, and dry parts clash. Oil seals help prevent this by sealing holes where lubricants can leak out. rubber seals are designed to offer optimum sealing performance and extreme durability even under high-peripheral speed. They are lightweight, compact, and exhibit high self-lubricating properties. Oil seals are manufactured with high-grade materials and last long without showing any signs of hardening, softening, or aging.

Moreover, oil seals are widely used throughout the aerospace industry in both space exploration and aviation applications. Sujan Industries manufactures all aircraft rubber items including O-rings, Gaskets, Seals, Pistons, Grommets, Washers, and Protective Boots & Bellows. In the aviation sector, pneumatics and hydraulics are used to operate components like landing gear and wing flaps. Rubber gaskets are needed in these systems to keep dust and air out while ensuring aircraft components run effectively.

How to Choose the Right Oil Seal

Picking the right type of oil seals is crucial for the proper functioning of machines because in some situations not all types can fit to work on certain machines.

There are quite a few factors to put into consideration when you&#;re choosing the right oil seal for your machine. Some of these factors include &#; dimensions, pressure, temperature, type of fluid, lubricant, shaft speed, shaft and bore tolerance, and more.

The capacity of oil seals to handle different intensities of pressure varies with their composition and application, so it is important to understand the compression set of your equipment. Just like the pressure, the temperature that your oil seal will be operating in must be known to be able to choose one that can withstand the working temperature.

Likewise, different types of fluids like grease, water, oil, fuels, etc. will come into contact with oil seals. So, knowing what type of fluids will be in constant contact with oil seals will help you choose the one capable of withstanding the surrounding conditions. When we talk about lubricants, seals always perform well when lubricated, however, in some machines there are dry spells. If you are a supplier of aftermarket parts in India or a user looking for oil seals in the aerospace industry, your search might end with Sujan Industries.

Wrapping Up

Oil seals are critical to a machine&#;s functionality. A machine&#;s oil seals are critical to its functionality. Picking the right seal for your machine is vital as it not only guarantees the optimum performance of applications but also ensures a safe working environment for years to come. With so many rotary shaft seal options available, it can be hard to know which one to choose for your machine! Contact us today to speak to one of our experts and pick the best one for you.

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