Key Questions to Ask When Ordering Industrial EPDM Rubber Seals

EPDM

EPDM is our most commonly extruded elastomer for rubber seals. It is a very good compound for use in outdoor applications as it is very resistant to weathering and ozone exposure (A quick note on ozone exposure: Ozone is found in the air in small quantities but creates an aging effect on elastomers that looks like cracking or dry rot. This reduces the performance of the material and after time will require the replacement of the seal). EPDM is not recommended where the medium it will operate in will have exposure to oils and gas, but it is water resistant and maintains its flexibility in low temperatures. In general EPDM will operate well in a temperature range of -80°F to 300°F.

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Silicone

Like EPDM, silicone is very resilient against the effects of ozone and UV light. If your application is going to expose it to gas, oil or acids or if it needs to have strong tensile strength it probably wouldn’t be the material of choice. Silicone is a more expensive elastomer than EPDM, but it has some benefits over EPDM that make it the material of choice for some applications. The key benefit that silicone has over EPDM is tolerance to cold and heat. Silicone can operate under conditions from -180°F to 525°F. This ability to withstand high heat makes silicone ideal for uses like sealing autoclaves. Silicone is an expensive option, but critical for extreme heat environments.

Neoprene

Neoprene is resistant to oils, ozone, and water amongst other things. Unlike silicone it resists cracking and abrasions when under stress or impact. Its operating range within cold and hot temperatures is similar to rubber, -80°F to 300°F. Neoprene is used in windows, electrical enclosures, expansion joints and lots of other applications. Neoprene costs a bit more than EPDM but won’t break the bank like a silicone compound.

Nitrile

Nitrile is in the middle of the road from a cost standpoint. It’s a great choice for applications such as oil seals, aircraft hoses, or anywhere resistance to oil, fuel and chemicals is important. Its optimal operating temperature range is from -55°F to 275°F, so not the best choice for extreme temperature ranges. Nitrile doesn’t do well resisting the aging effects of sunlight or exposure to the elements but can be compounded in order to increase its resistance to these effects.

PVC

PVC has a limited temperature rating of -20°F to 158°F. PVC is a thermoplastic, which means that it is cured when it cools down. This is very different from the other elastomers in this article, which are thermosets...meaning they cure when heated up. So if PVC gets too hot it can become deformed. PVC can fade in sunlight, but Uni-Grip’s PVC has an additive to reduce the effects of fading, making it a good choice for outdoor conditions. If there will be exposure to oil or gas, then you may want to choose a different material as PVC doesn’t resist these materials well.

Selecting the Right Seal for Your Application

When choosing seals, you should consider several factors, including the type of seal, its application, seal material, hardness, and attachment. We manufacture a wide range of seals, including:

• Bulb seals: Used to seal doors with hollow circular seals
• Flap seals: Incorporates a wiper blade to exclude moisture
• Trim seals: Seals against the elements using a rubber bulb attached to a firm plastic edge trim
• Lid seals: Protects against moisture and dirt
• Slide-out seals: Prevents ingress of moisture, dirt and dust on RV slide-out rooms
• Accordion seals: Seals gaps between a camper shell and a truck

We supply a range of seal materials for different environments. Materials may withstand exposure to cold and hot water, fuels, hydraulic fluids, or extreme ambient temperatures. Choices include EPDM synthetic rubbers, nitrile rubber, silicone, and PVC. Many of the seals incorporate a metallic core to increase strength and rigidity. Sponge rubber is used for door seals, while dense rubber has better impact absorption properties. Some seals have a dual durometer with a more rigid mounting material and a less dense seal. Attachment options include flange mounting, pedestal mount, and adhesive mounts.

Buna, EPDM, Viton® are all similar seal materials but what stands each of these apart? Choosing the right elastomer or polymer material is important for a number of reasons. While it may not seem like a major decision, the material chosen determines the quality, lifespan, and performance of an application. From snapping to peeling to breaking; a seal material that is a poor fit for an application can lead to a number of issues down the road. Seal material has a long-term effect on your application's capabilities.

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The information outlined below will offer guidance and provide the best solution based on the most defined aspects of your application including:

• Impact and temperature resistance
• Compression strength
• Assembly and physical properties
• Weather conditions
• Chemical compatibility

First Item to Consider: What Does High Elasticity Mean?

The term 'high elasticity' is known in the industry as the ability of an object to return to its shape once it no longer is attached to its source of stress. Rubber compound represents a wide collection of materials ' known as elastomers ' which includes base elastomer, vulcanization agents, fillers, and plasticizers its main feature being high elasticity. Therefore, rubber is widely considered the best material for objects known as 'seal materials'.

Questions to consider when selecting the right seal material for an application include:

• Will this application be exposed to water, oil, gas, harsh chemicals, or other materials?
• What is the minimum and maximum temperature resistance?
• What is the required compression strength?
• Will this application be exposed to sunlight for hours at a time?

Whether you're choosing Buna (Nitrile), EPDM, or Viton®, it's important to compare and consider all key features and benefits.

BUNA

When it comes down to abrasive, water and oil resistant, and super-strength properties; Buna is the most cost-effective elastomer. Buna, also referred to as Nitrile rubber, is commonly known as the industry's most economical option in the wide variety of seal material options to choose from. Buna is well known in the industry for its mechanical performance and is the top performer when it comes down to oil-based, petrochemical, and chemical applications. The more Nitrile in a polymer means a higher resistance to chemicals, acids, and other oils.

Therefore, Buna is widely used in the industry for crude oil, water, various alcohol, silicone grease, and hydraulic fluid applications due to its inflexibility.

Buna is comprised of synthetic rubber copolymer that performs well in applications requiring metal adhesion and abrasion-resistant material ' this chemical background makes it ideal for sealant applications. Designed with a moderately poor acid and mild alkali resistance, Buna can also withstand low temperatures. However, Buna is limited to extremely high temperatures, can be weather and sunlight resistance, and steam resistance ' making it limited to more extreme applications. Buna is also not suitable with CIP sanitizing agents containing acids and peroxides, such as OXONIA.

Key advantages and benefits to consider about Buna include:

• Economical and affordable
• Strong and sturdy elongation
• Good for oil and water resistance
• Features a low compression set
• High abrasion resistance
• Heavy duty strength
• Wide range in temperature resistance
• Heat resistant and cold resistant

Disadvantages of Nitrile rubber include:

• Limited extreme temperature resistance
• Poor flame resistance
• Not suitable for hydraulic liquids, brake fluids, ketones, and acetates
• Limited sunlight, weather, and ozone resistance

Key applications for Nitrile rubber in the valve industry:

• Sealants
• O-rings
• Molded products

EPDM

When considering flexibility strength, weather resistance, and the ability to withstand extreme conditions, EPDM is an excellent option. EPDM, also known as Ethylene Propylene Diene Monomer, is a specific type of synthetic rubber and one of the most commonly used elastomeric materials for automotive, construction, and mechanical good applications. Slightly more expensive when compared to Buna, it can withstand a variety of thermal, weather, and mechanical properties because of its long-lasting high tensile strength. It's ideal for applications that involve water, chlorine, bleach, and other alkaline materials. From waterproofing needs to HVAC needs, EPDM is used for a variety of industrial applications because of its resistance to weathering, ozone, and deionized water. With both elastic and adhesive properties, once stretched EPDM always returns to its original shape regardless of the temperature. However, EPDM is not recommended for petroleum oil, fluids, chlorinated hydrocarbon, or hydrocarbon solvent applications.

Key advantages to consider about EDPM includes:

• Wide operational temperature range
• Suitable for extreme environment and cold materials
• Superior ozone and sunlight resistance
• Good compression set
• Sturdy tear, abrasion, and steam resistance
• High tolerance to sodium hydroxide solutions, diluted acids, ketones, and alkalis
• Versatile for a number of applications including but not limited to the industrial and HVAC industries

Disadvantages of EPDM include:

• Easy to damage
• Poor resistance to petroleum-based fuels
• Difficult to adhere to
• Not compatible with a variety of oils or acids

EPDM is used across a wide range of industrial applications, including:

• Seals and O-rings
• Tubing
• Washers

VITON®

Viton® is the more expensive option over BUNA and EPDM seals but it's the perfect high-end solution for applications exposed to extreme weather, ozone, and chemical degradation. Significantly more expensive when compared to EPDM and Buna, Viton® is a long-lasting high-performance fluorinated hydrocarbon rubber product most commonly used in O-Ring and seals for the valve industry. Excellent for resistance to ozone, oxidation, and extreme weather conditions ' including a variety of materials such as aliphatic and aromatic hydrocarbons, halogenated fluids, strong acid materials ' Viton® is one of the robust fluoroelastomers. Designed to withstand extreme temperatures, Viton® seals are the preferred option for the most challenging and demanding sealing needs.

Viton® is able to provide support for an extremely broad range of substances and features exceptional good resistance to high temperatures and excellent resilience capabilities.

Key advantages to consider about Viton® include:

• Powerful when under pressure
• High-temperature performance
• Outstanding chemical compatibility among a wide variety of chemicals and acids
• Retains flexibility and elasticity in high-pressure applications
• Excellent use for sterilization
• High-heat resistance
• Absorbs fluids quickly and efficiently
• Longer life span
• Environmentally-friendly

Disadvantages of Viton® include:

• More expensive than Nitrile
• Incompatible with ketones
• Not as strong or effective in lower temperatures

Reliable material for:

• O-Ring applications
• Pumps and valves
• Seal leaks

As noted above, choosing the correct polymer is highly important for a variety of reasons. While all seal materials are similar, each polymer serves a wide variety of purposes to meet your specific need. If you need further assistance choosing the right rubber material or polymer for your valve application, please contact Flomatic Valves by visiting Flomatic.com or calling (800) 833-.

In this comprehensive guide, we will take an in-depth look at rubber seals and gaskets, examining their significance in various industries, exploring the various types available, and highlighting crucial factors to consider when making your choice. We will also provide valuable tips on maintaining these items and, importantly, how to know when they need replacing. Let's dive in and unlock the untapped potential of rubber seals and gaskets for your industry!

Understanding Rubber Seals and Gaskets

In oil and gas or any industry that involves machinery or systems that transport fluids or gases, rubber seals and gaskets play a pivotal role in ensuring everything runs smoothly. But what exactly are rubber seals and gaskets, and what functions do they serve?

Defining Rubber Seals and Gaskets

At their core, rubber seals and gaskets are flexible components designed to prevent the leakage of fluids or gases between two connecting parts of a system. They are made from various rubber materials, which give them the resilience and elasticity to withstand high pressure, high temperatures, and potential corrosive substances they might come into contact with.

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The Essential Function of Seals and Gaskets

The primary function of rubber seals and gaskets is to maintain a tight seal between connecting parts, effectively preventing the escape or entry of fluids or gases. This is crucial for maintaining system pressure and efficiency, as well as preventing potential contamination in sensitive applications like food processing or pharmaceutical manufacturing.

Whether it's a car's braking system, a heating and cooling system in a building, or a food processing machine, rubber seals and gaskets contribute significantly to the overall performance and safety of the systems. Understanding the essential role of these components is the first step in selecting the right ones for your industrial applications.

Types of Rubber Materials for Gaskets and Seals

Rubber gaskets are essential components used in various industries to provide a reliable seal between two surfaces. Different gasket materials can withstand different pressures, temperatures, and other factors, such as moisture, chemicals, and oxidation. Sometimes finding the perfect seal isn't going to happen.  Finding the best possible sealing material is the key. They offer distinct properties that make them suitable for specific applications. Here, we will explore the common types of rubber gasket materials.

Natural Rubber(NR)

Natural rubber offers excellent mechanical properties, including high elasticity and tensile strength. It's highly resistant to abrasion and tear and is often used in applications involving dynamic stresses. However, its resistance to heat and oil is quite limited.

Nitrile Rubber (NBR)

Nitrile rubber is known for its excellent oil and fuel resistance. It also provides good resistance to heat, wear, and abrasion, making it an ideal choice for sealing applications in the automotive and industrial sectors.

Silicone Rubber

Silicone rubber provides superb resistance to high and low temperatures, ozone, and UV light. Although not as strong as other rubber types, its non-reactive nature makes it suitable for medical and food-related applications.

Fluorocarbon Rubber (FKM)

FKM rubber offers excellent chemical and heat resistance. It's highly valued in the aerospace, automotive, and energy industries where components need to withstand harsh conditions.

Ethylene Propylene Diene Monomer (EPDM)

EPDM is characterized by its superior resistance to ozone, weathering, and aging. It's extensively used in outdoor applications and for sealing hot water and steam.

Choosing the right gasket material is crucial as it ensures optimal performance based on environmental conditions. The importance of selecting the right material for your seal or gasket cannot be overstated. The wrong material can cause a seal or gasket to fail resulting in equipment damage, production delays, shorter product life, or even injury. Material selection should always begin with an assessment of the application in which the seal or gasket will be utilized to ensure it meets your specific needs.

Choosing the Right Gasket or Seal for Your Specific Application

When selecting a rubber seal or gasket for your specific application, there are several important factors to consider. These factors will ensure that you choose the right material that can withstand the demands of your particular environment.

1. Temperature Range and Pressure Requirements:
   • Evaluate the temperature range in which the seal or gasket will be exposed.
   • Consider the pressure requirements of your application.
   • Choose a material that can handle both the temperature and pressure conditions effectively.
2. Chemical Exposure:
   • Assess the compatibility of the seal or gasket material with different fluids and gases it may come into contact with.
   • Determine if there will be exposure to any chemicals or corrosive substances.
   • Select a material that is resistant to chemical degradation.
3. Operating Conditions:
   • Evaluate any specific operating conditions such as vibration, UV exposure, or mechanical stress.
   • Ensure that the chosen seal or gasket material can withstand these conditions without deteriorating.

By carefully considering these factors, you can make an informed decision when choosing rubber seals and gaskets for your specific application. This will help ensure optimal performance, longevity, and reliability in your equipment or machinery.

Remember, selecting the right rubber seal or gasket is crucial for maintaining proper functionality and preventing leaks or failures. Take into account temperature range, pressure requirements maximum temperature, chemical exposure, and operating conditions to find a suitable material that meets all these needs. With careful consideration and evaluation, you can confidently choose a rubber seal or gasket that will perform effectively in your specific application.

Tips for Maintaining and Replacing Rubber Seals and Gaskets

Rubber seals and gaskets, though often overlooked, play a crucial role in ensuring the optimal operation of various equipment and machinery. To extend their lifespan and ensure they continue to function effectively, it's essential to understand how to properly maintain and replace these components.

Regular Inspection

Perform regular inspections of your rubber seals and gaskets. Look for signs of wear, deformation, hardening, or cracking. These could be early indicators that the seal or gasket is failing and needs replacement.

Use Appropriate Cleaning Agents

Some cleaning agents can cause the deterioration of rubber materials. Always ensure the cleaning agents used are compatible with your specific rubber material. Avoid using harsh chemicals that can degrade the rubber.

Avoid Over Compression

Over-compressing a rubber seal or gasket can cause it to deform, leading to leaks or failures. Ensure the seal or gasket is correctly fitted and that there's sufficient compression to create a seal without deforming the component.

Temperature and Storage

Extreme temperatures can degrade rubber material. Therefore, when not in use, rubber seals and gaskets should be stored in a cool, dry place away from sunlight, ozone, and extreme temperature changes.

Regular Replacement

Even with optimal maintenance, rubber seals and gaskets have a finite service life. It's important to have a regular replacement schedule based on the manufacturer's guidelines or the specific demands of your application.

Seek Professional Assistance

If you're uncertain about the state of your gasket or seal, seek advice from your manufacturer. They possess the necessary expertise to guide you on maintenance or when a replacement is necessary.

Maintaining your rubber seals and gaskets can greatly increase their lifespan and the overall effectiveness of your machinery. Always remember, proactive maintenance is far cheaper than reactive maintenance.

Conclusion

Choosing the right rubber seals and gaskets is a crucial aspect of maintaining operational efficiency and reliable performance in your industry. By understanding their differences, materials used, and essential maintenance tips, you can make an informed choice that fits your specific application needs, thereby improving performance and reducing maintenance costs.

Hongju Silicone: Trust Us for Top-Quality Rubber Seals and Gaskets

Partnering with Hongju Silicone means benefiting from our expertise and commitment to quality. We offer a broad range of rubber seals and gaskets to meet diverse industrial requirements.

Our team of technical specialists, design engineers, and industrial experts has created custom gaskets, and our experienced team can provide guidance on selecting the appropriate material for your application.

The company is the world’s best Tpe Weatherstripping supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.