Seal Material Selection Guide: Choosing the Right Material for Your Application

Choosing the right seal material is one of the most important factors in ensuring long-lasting performance, reliability, and compliance for your equipment. The material you select directly impacts temperature resistance, chemical compatibility, wear life, and cost-effectiveness. Using the wrong material can lead to premature seal failure, costly downtime, and even regulatory compliance issues.

At MSP Seals, we work with a wide range of sealing materials, including NBR, HNBR, FKM (Viton^®), EPDM, PTFE (Teflon^®), Silicone, Neoprene, and Urethane to serve industries like automotive, agriculture, food & beverage, medical devices, oil & gas, and general industrial manufacturing. Each material offers unique strengths and trade-offs depending on your application.

This guide is designed to help engineers, buyers, and maintenance professionals compare seal materials side-by-side and make confident decisions based on performance, compliance, and cost.

Why Material Choice Matters

Performance. Seal materials must handle the right temperature range, pressure, and chemical environment without degrading.
Compliance. Certain industries require FDA, NSF, or food grade materials, particularly in food, beverage, and medical applications.
Cost. Balancing upfront material cost with long-term reliability and reduced downtime is critical for efficient operations.

The right choice helps maximize uptime, extend equipment life, and reduce total cost of ownership.

Seal Material Comparison Table

Material	Temp Range (common)	Chemical Resistance	Key Applications
NBR	-40°C to 120°C	Good with petroleum oils, fuels; poor with ozone/UV	Hydraulic seals, O-rings for automotive systems, oil seals in industrial machinery
HNBR	-40°C to +150°C	Better chemical, ozone & heat resistance than NBR	Seals for agriculture equipment, automotive, air conditioning, oilfield components; high pressure seals
FKM	-20°C to 200°C	Excellent chemical, oil, and fuel resistance; strong high-temp performance	Rotary shaft seals for automotive, factory equipment seals and chemical processing industries; mechanical pump seals
FFKM	-55°C to 327°C	Strong acids, organic solvents, oxidizers, steam and plasma environments	Aggressive chemical reactors, oil and gas HPHT applications, semiconductor water processing, paint equipment
EPDM	-50°C to 150°C	Excellent resistance to steam, water, and weather; poor with oils/fuels	FDA-compliant seals for food & beverage, medical equipment, HVAC systems
PTFE	-200°C to 260°C	Outstanding chemical resistance; excellent for high-temp & aggressive environments	Food grade seals, medical device components, chemical processing gaskets, Teflon O-rings
Silicone	-60°C to +200°C	Good with ozone, weather, and many chemicals; not great with oils/fuels	Medical device seals, food & beverage processing equipment, high-temp O-rings
Neoprene	-40°C to +120°C	Good resistance to oils, refrigerants, ozone; moderate chemical resistance	Seals for refrigeration, HVAC, and general industrial equipment
Urethane	-30 to +90	Very strong abrasion resistance; moderate chemical performance	Hydraulic wipers & rod seals for heavy equipment, agricultural machinery

The information provided in this resource guide is for general informational purposes only and is not intended as specific guidance or instruction. Each application is unique, and the MSP Seals team can assist in selecting materials or solutions best suited to your specific requirements.

Choosing the Right Seal Material

Selecting the right seal material is one of the most important steps in ensuring a seal’s performance, reliability, and cost-effectiveness. Each material offers unique strengths—such as chemical resistance, temperature stability, or abrasion durability—that make it better suited for specific industries and applications. Below, you’ll find an overview of the most common seal materials MSP Seals provides, including their performance characteristics, ideal applications, and when to use them.

NBR (Nitrile Rubber)

Short Description. NBR is one of the most widely used sealing materials due to its excellent resistance to oils and fuels, combined with cost-effectiveness.
Performance Characteristics. Handles temperatures from -40°C to +120°C with good abrasion resistance, but limited resistance to ozone, weathering, and sunlight.
Best Industries / Seal Applications. Automotive oil seals, hydraulic systems, and industrial machinery requiring fuel and oil compatibility.
When to Use It. Choose NBR when you need a reliable, low-cost seal for fuel, oil, or grease applications without heavy exposure to ozone or outdoor conditions.

HNBR (Hydrogenated NBR)

Short Description. HNBR is a highly durable rubber with improved heat, chemical, and ozone resistance compared to standard NBR.
Performance Characteristic. Operates between -40°C and +150°C with excellent tensile strength and resistance to wear, aging, and ozone.
Best Industries / Seal Applications. Automotive air conditioning seals, agricultural equipment, and oilfield and energy applications.
When to Use It. Select HNBR when seals must withstand higher heat, ozone, or aggressive fluids where standard NBR would degrade quickly.

FKM (Viton^®)

Short Description. FKM, often branded as Viton^®, is a premium fluorocarbon elastomer known for its exceptional chemical and high-temperature resistance.
Performance Characteristic. Withstands temperatures from -20°C to +200°C and resists fuels, oils, solvents, and aggressive chemicals.
Best Industries / Seal Applications. Automotive fuel systems, chemical processing equipment, and rotary shaft seals.
When to Use It. Ideal when maximum chemical resistance, fuel compatibility, and high-temperature endurance are required.

FFKM

Short Description. FFKM, is a fluorocarbon elastomer containing an even higher content of fluorine than FKM. This provides an improved resistance to high temperatures and chemicals
Performance Characteristic. Operates between -55°C to 327°, with some grades operating to a higher temperature, broad temperature capabilities for high and low temperature resistance and chemical processing.
Best Industries/ Seal Applications. Aggressive chemical processing, oil and gas HPHT applications, semiconductors, water manufacturing, and paint equipment.
When to use it. Use FFKM when high temperature endurance is required. A common producer is Dupont Kalrez^®

EPDM (Ethylene Propylene Diene Monomer)

Short Description. EPDM is a synthetic rubber with excellent resistance to weather, ozone, and steam, often used in regulated industries.
Performance Characteristic. Operates in ranges from -50°C to +150°C with excellent water, steam, and chemical resistance, but poor compatibility with oils and fuels.
Best Industries / Seal Applications. FDA-compliant seals for food & beverage, medical devices, HVAC, and water treatment systems.
When to Use It. Choose EPDM for applications requiring FDA compliance, water or steam exposure, and outdoor weathering resistance.

PTFE (Polytetrafluoroethylene / Teflon^®)

Short Description. PTFE is a high-performance fluoropolymer with unmatched chemical resistance and a wide operating temperature range.
Performance Characteristic. Performs between -200°C and +260°C and is highly resistant to almost all chemicals, with low friction and non-stick properties.
Best Industries / Seal Applications. Food & beverage processing equipment, chemical plants, and medical device components.
When to Use It. Use PTFE seals when they must resist aggressive chemicals, extreme temperatures, or require FDA/medical-grade compliance.

Silicone

Short Description. Silicone rubber is valued for its flexibility, high-temperature stability, and biocompatibility.
Performance Characteristic. Functions from -60°C to +200°C and is resistant to ozone, weathering, and many chemicals, but has limited oil and fuel resistance.
Best Industries / Seal Applications. Medical device seals, food & beverage processing, and high-temperature O-rings and gaskets.
When to Use It. Select silicone when biocompatibility, sterilization, or high-temperature stability are needed.

Neoprene (Chloroprene Rubber / CR)

Short Description. Neoprene provides balanced performance with good resistance to refrigerants, oils, ozone, and weathering.
Performance Characteristic. Operates from -40°C to +120°C, offering moderate oil resistance and good durability against weathering and aging.
Best Industries / Seal Applications. Refrigeration and HVAC seals, industrial machinery, and general-purpose sealing.
When to Use It. Use neoprene for refrigeration, HVAC, or applications requiring moderate oil resistance and strong weather durability.

Urethane (Polyurethane / PU)

Short Description. Urethane is a tough, abrasion-resistant material ideal for dynamic sealing applications.
Performance Characteristic. Works in ranges from -30°C to +90°C with excellent tear resistance, tensile strength, and load-bearing capacity.
Best Industries / Seal Applications. Hydraulic wipers and rod seals for construction equipment, agricultural machinery, and heavy-duty hydraulics.
When to Use It. Choose urethane for high-abrasion, heavy-duty sealing environments where strength and wear resistance are critical.

FAQ Section

What is the difference between NBR and HNBR seals?

NBR (nitrile or Buna-N) is a widely used elastomer because of its excellent resistance to petroleum oils, fuels, and many hydraulic fluids. HNBR is a hydrogenated version of NBR that retains the same basic oil and fuel resistance but adds significantly better heat, ozone, and aging resistance as well as improved abrasion and tear strength. In practice, NBR is usually the economical choice for general service, whereas HNBR is preferred in harsher conditions or where longer life at higher temperatures is required.

Which seal material is best for high-temperature applications?

For very high temperatures, PTFE is generally considered the top choice because it can handle a wide temperature range and is highly inert. Among elastomers, FKM (Viton^®/fluorocarbon) offers excellent performance up to around 200°C–250°C, and silicone or HNBR can be used for moderate high-temperature conditions depending on the specifics. PTFE or high-grade FKM is typically selected where extreme heat or a broad operating range is needed.

Are EPDM seals FDA-approved for food and beverage use?

EPDM is commonly used in food and beverage processing because of its resistance to hot water, steam, and cleaning agents; however, it is not automatically FDA-approved by virtue of being EPDM. Only EPDM compounds that are specifically formulated and certified under FDA food-contact regulations are suitable, so you would need to confirm that the particular EPDM grade supplied meets those requirements.

How does PTFE compare to Silicone for chemical resistance?

PTFE offers far superior chemical resistance to almost all acids, bases, solvents, and aggressive chemicals compared to silicone. Silicone performs well with mild chemicals but can be attacked by strong acids, bases, oils, and solvents. Silicone excels in flexibility and low-temperature resilience, but PTFE is the material of choice for harsh chemical environments.

What industries commonly use FKM (Viton^®) seals?

FKM (fluorocarbon) seals are widely used in industries such as automotive, aerospace, oil and gas, chemical processing, and other sectors where heat, oils, fuels, and aggressive chemicals are present. Their combination of thermal and chemical resistance makes them a go-to choice for demanding industrial environments.

Why choose Urethane seals for hydraulic applications?

Urethane seals are chosen for hydraulic systems because they have exceptional wear and abrasion resistance, high tear strength, and excellent load-bearing capability. These properties allow them to withstand the pressures and dynamic stresses of pistons and rods in hydraulic cylinders far better than many other elastomers.

Are Neoprene seals suitable for refrigeration and HVAC systems?

Neoprene seals can be used in some refrigeration and HVAC systems, especially older ones, but they are less ideal for many modern refrigerants compared to materials like HNBR or fluorocarbon. For long-term reliability with today’s refrigerants and lubricants, most designers prefer elastomers specifically rated for those conditions rather than general-purpose neoprene.

What seal materials offer the best resistance to oils and fuels?

The best resistance to oils and fuels is usually found in NBR, HNBR, and FKM (Viton^®) elastomers, with PTFE providing near-total chemical inertness when an even higher level of protection is needed. Fluorosilicone can also be used when silicone-like flexibility is desired with improved fuel resistance.

Which sealing materials are most durable in abrasive environments?

In abrasive conditions, urethane is one of the most durable elastomer choices because of its exceptional abrasion resistance. Filled PTFE compounds are also used for their low friction and wear properties. HNBR offers better abrasion resistance than standard NBR, so it is often considered when a combination of oil resistance and durability is required.

How do I select the right seal material for my project specifications?

The best way to select a seal material is to define the temperature range, pressure, chemical exposure, and mechanical conditions of your application, then match those requirements with the material properties of potential seal compounds. After ruling out incompatible materials and considering regulatory needs such as FDA compliance, you can test promising options under real conditions. Because MSP Seals supplies a wide range of materials—including NBR, HNBR, FKM, EPDM, PTFE, urethane, and custom compounds—providing them with your specifications will allow them to recommend the optimal seal material for your project.

Is FKM and Viton the same?

While all Viton is FKM, not all FKM is Viton, as there are a variety of formulations and manufacturers of FKM. Viton is a specific material developed by Chemours.

ISO Certifications & PPAP Availability

All of our sealing solutions are available in both standard and custom configurations. MSP Seals operates as an ISO 9001:2015 and ISO 14001:2015 certified facility and also offers full PPAP capabilities. As a trusted partner for both OEM and MRO applications, we provide high and low-volume sealing solutions tailored to meet the unique needs of every customer.

Partner with MSP Seals

Choosing the right seal material is critical for reliable performance, regulatory compliance, and long-term cost savings. Whether your application calls for hydraulic seals, oil seals, or specialized options like PTFE (Teflon^®) seals or custom molded gaskets, MSP Seals has the expertise to guide you.

As a trusted partner for industries ranging from automotive to food & beverage and medical, MSP Seals combines engineering knowledge with a wide product range—including seal kits, rotary shaft seals, and custom seals—to deliver solutions that match your specifications.

When precision and durability matter most, MSP Seals is here to help you identify the right material and ensure lasting performance.

Contact MSP Seals today to discuss your project requirements or request a quote.