Valve Base Selection: Nitrile, EPDM and Viton

Buna, EPDM, Viton are all similar sealing materials, but what is the difference between each of them? Choosing the right elastomer or polymer material is important for a number of reasons. A seal material that is not suitable for the application can cause many problems with the valve. Sealing materials have a long-term impact on the function of your application.

The information outlined in Manufacturer LIWEI below will provide guidance and the best solution based on the most specific aspects of your application.

Highly Resilient

The term "high elasticity" is known in the industry as the ability of an object to recover its shape once it is no longer attached to its source of stress. Rubber compounds represent a broad collection of materials - called elastomers - which include base elastomers, vulcanizing agents, fillers and plasticizers, whose main characteristic is high elasticity. Therefore, rubber is widely considered to be the best material for objects called "sealing materials".

 Aluminum Alloy Handle Stainless Steel CF8 Wafer Butterfly Valve

Nitrile rubber

Boiled down to abrasion resistance, water resistance, oil resistance and super performance; Buna is the most cost-effective elastomer. Buna, also known as nitrile rubber, is often referred to as the industry's most economical choice among the many sealing materials available, and Buna is well known in the industry for its mechanical properties, performing best in oil-based, petrochemical and chemical applications. More nitrile in a polymer means greater resistance to chemicals, acids and other oils.

As a result, Buna is widely used in industry for crude oil, water, various alcohols, silicone greases and hydraulic fluid applications due to its inflexibility.

Key Benefits

Affordability

Strong and robust elongation

Good oil and water resistance

Has low permanent deformation in compression

High abrasion resistance

Heavy-duty strength

Wide range of temperature resistance

Heat and cold resistance

Electric Actuator Wafer Butterfly Valve

EPDM rubber

EPDM is a good choice when considering flexibility, weather resistance and the ability to withstand extreme conditions. EPDM, also known as EPDM monomer, is a special type of synthetic rubber and one of the most common elastomeric materials used in automotive, construction and mechanical applications. Slightly more expensive than NBR, it can withstand a wide range of thermal, weather and mechanical properties due to its long-lasting high tensile strength. EPDM has both elastic and adhesive properties, and once stretched, they always return to their original shape, regardless of temperature.

Key Benefits

Wide working temperature range

Suitable for extreme environments and cold materials

Excellent ozone and sunlight resistance

Good compression set

Robust tear, abrasion and vapor resistance

High resistance to sodium hydroxide solutions, dilute acids, ketones and bases

Stainless Steel Bellow Globe Valve PN16

Fluoroelastomer

Viton is a more expensive option than BUNA and EPDM seals, but is the perfect high-end solution for applications exposed to extreme weather, ozone and chemical degradation. Much more expensive than EPDM and Buna, Viton is a durable, high-performance fluorinated hydrocarbon rubber product most commonly used in O-rings and seals in the valve industry. viton offers excellent resistance to ozone, oxidation and extreme weather conditions - including a variety of materials such as aliphatic and aromatic hydrocarbons, halogenated fluids, and strong acid materials.

Key Benefits

Strong under pressure

High temperature performance

Excellent chemical compatibility

Flexibility and elasticity in high-pressure applications

Excellent for sterilization applications

High heat resistance

Fast and effective absorption of liquids

Longer service life

Environmentally friendly

As mentioned above, it is important to choose the right polymer for many reasons. While all sealing materials are similar, each polymer has multiple uses to meet your specific needs. If you need professiobal help, please contact us today.

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