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
s
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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Dec 09,
1. What is polyurethane oil seal?
Polyurethane oil seal is a sealing device made of polyurethane material. It is widely used in mechanical systems and is mainly used to prevent oil or grease from leaking from the connections of mechanical parts. This kind of oil seal is usually located in bearings, reducers, hydraulic cylinders and other equipment to ensure the normal circulation of lubricating oil and prevent dust, moisture and other impurities from entering.
2. What are the advantages of polyurethane oil seals?
Polyurethane oil seals offer a variety of benefits, including excellent wear, oil and corrosion resistance. Due to its high elasticity and strength, polyurethane oil seals perform well in high-speed, high-temperature, and high-pressure environments. Additionally, their sealing properties reduce friction, prevent leaks, and increase the efficiency and longevity of mechanical systems.
3. What applications are polyurethane oil seals suitable for?
Polyurethane oil seals are widely used in industry, automobiles, aerospace and other fields. They are commonly found on mechanical components such as hydraulic systems, engines, transmissions, and pumps. They are used to prevent fluid or grease leakage and ensure smooth operation of equipment.
4. What is the difference between polyurethane oil seals and oil seals made of other materials?
Compared with some traditional materials, such as rubber, polyurethane oil seals have better wear resistance and durability. They are able to work under harsh conditions for long periods of time and are not easily affected by oil, weather and chemicals, making them more popular in some applications that require high durability.
5. Does polyurethane oil seal require special installation and maintenance?
The installation of polyurethane oil seals often requires great precision to ensure that they seal correctly on the equipment. In terms of maintenance, it is important to regularly inspect the oil seals for wear, cracks, or other damage. At the same time, keeping the mechanical system clean and avoiding dust and particulate matter will help extend the service life of the polyurethane oil seal.
