PTFE vs. Rubber Seals: Key Differences and Benefits

Feb 26, 2025

Seals are used in a wide range of industrial applications to ensure leak-proof systems and prevent contamination and air exchange in sensitive processes. Seals made of both PTFE and rubber find wide usage across industries, depending on the requirement. Polytetrafluoroethylene or PTFE seals have exceptional chemical resistance and high-temperature endurance that make them suited for harsh, demanding environments, while rubber seals are valued for their flexibility, cost-effectiveness, and reliable performance in lower-pressure and less aggressive settings. This post compares PTFE vs. rubber seals in terms of their thermal properties, melting temperatures, mechanical properties, and more. It highlights their key differences and benefits, which may help you determine which seal material is best suited for your sealing needs.

Key Differences Between PTFE and Rubber Seals

Understanding PTFE and Rubber Seals

PTFE or PTFE polymer seals is a synthetic fluoropolymer of tetrafluoroethylene that is commonly known by the brand name Teflon. This is a very versatile, non-reactive material with a unique set of properties. PTFE creates a durable, resilient barrier that resists wear, leakage, and chemical degradation. These seals are generally used in industries where conventional materials fail to perform, such as chemical processing, pharmaceuticals, and food manufacturing.

Rubber is derived from natural latex or synthesized from petrochemical sources. There are various types of rubbers, such as isoprene (natural) and styrene, butadiene (synthetic). Most of these are known for its excellent oil and fuel resistance, often used in automotive and industrial sealing. Rubber works by creating a compressive seal that fills gaps and prevents leaks between two surfaces. When compressed, rubber forms a tight barrier that resists fluid and gas leakage, ensuring containment in both static and dynamic systems.

Key Differences Between PTFE and Rubber Seals

Here are the detailed difference between both the seals explained.

Parameter	PTFE Seals	Rubber Seals
Temperature Resistance	This can withstand continuous temperature exposure up to 260°C (500°F) and short-term exposure to 300°C (572°F). Ideal for high-temperature environments such as engine compartments and chemical reactors.	Temperature resistance varies by rubber type; for instance, Nitrile: up to 120°C (248°F) EPDM: up to 150°C (302°F) Silicone: up to 200°C (392°F). Suitable for moderate temperature applications.
Chemical resistance	Highly resistant to acids, alkalis, solvents, and aggressive chemicals. Does not degrade or react with harsh chemicals, making it perfect for chemical processing, pharmaceuticals, and food-grade applications.	Chemical resistance varies by rubber type: Nitrile: Excellent oil and fuel resistance. EPDM: Best for water, steam, and ozone. Silicone: Limited chemical resistance but excellent for high-temperature applications. Overall, may degrade more when exposed to harsh chemicals compared to PTFE.
Wear and friction resistance	Very low coefficient of friction, reducing wear and tear. Highly durable in dynamic applications, such as valves and pumps, where constant movement occurs.	Moderate friction resistance. Can wear down more quickly under continuous sliding or rubbing conditions due to higher friction coefficients. Best suited for static or low-movement applications.
Durability and lifespan	Extremely durable, resistant to abrasion and aging. Longer lifespan even under extreme conditions, reducing the frequency of replacements. Low maintenance requirements	Generally shorter lifespan compared to PTFE, when exposed to harsh conditions. Susceptible to hardening, cracking, or degradation over time when exposed to extreme environments (e.g., ozone, high heat).
Flexibility	Rigid material with low flexibility, making it less suitable for highly dynamic or compressed environments. Works best in static or low-compression applications.	Highly flexible and compressible, able to form tight seals under pressure. Ideal for applications requiring high sealing force and flexibility (e.g., rotating machinery, sealing uneven surfaces).
Resistance to contamination	Inert and non-porous, preventing contamination of sensitive systems. Ideal for high-purity applications (e.g., food, pharmaceuticals).	Can absorb contaminants and oils over time, potentially affecting performance. Suitable for less sensitive, non-critical applications.
Compression set resistance	Excellent resistance to compression set, meaning PTFE seals retain their shape and sealing properties even after prolonged compression.	Prone to compression when prolonged in a single state, especially in high-temperature environments. Seals may lose effectiveness after extended pressure exposure.
Ease of installation	Relatively easy to install in static or low-motion applications, but can be challenging in dynamic environments due to its stiffness.	Easy to install and conform to various shapes and sizes due to its flexibility. Ideal for applications with complex geometries or irregular surfaces.
Cost	Typically more expensive than rubber seals due to manufacturing complexity and superior material properties.	Generally, more cost effective, making it a better option for budget-sensitive applications.
Environmental resistance	Resistance to UV, ozone, and weathering make it suitable for outdoor and harsh environmental conditions.	Varies by rubber type, but many rubber seals are vulnerable to UV degradation, ozone, and weathering unless specifically treated (e.g., EPDM).

Both PTFE and rubber seals offer distinct advantages depending on the specific requirements of your application. If you're looking for high-quality PTFE seals or custom rubber seals designed to withstand extreme conditions and provide superior performance, do explore our PTFE seal options at SSP Seals, a known PTFE and rubber seals manufacturer and supplier. For any inquiries or further assistance, don’t hesitate to contact us via email at gm@sspseals.com Or +1 908-852-3125