June 10, 2025
When comparing EPDM and PTFE materials, both serve the primary function of a gasket: to create a reliable seal between two surfaces, even when they are irregular. Ethylene Propylene Diene Monomer (EPDM) and Polytetrafluoroethylene (PTFE) gaskets are widely used in various industries due to their unique material properties.
Durlon® PTFE sheet gaskets are especially known for their broad temperature tolerance and outstanding resistance to chemical degradation. They are highly valued in industries where chemical inertness and hygienic performance are essential, including water treatment, pharmaceuticals, food and beverage production, and petrochemical processing. This article examines the distinct properties of EPDM and PTFE, evaluates each material independently, and addresses the question of which gasket material is better suited for specific applications.
What is the Difference Between EPDM and PTFE?
EPDM is classified as an elastomer, which is a synthetic rubber, whereas PTFE is a fluoropolymer, a plastic first commercialized in 1950 and widely recognized under the brand name Teflon. EPDM offers elasticity, resistance to weathering, and stability against chemicals such as alcohols and diluted acids. However, it is not compatible with petroleum-based substances and is therefore not suitable for food-related applications.
PTFE has several advantages, including a low coefficient of friction and an extensive temperature operating range from -350°F to 500°F (-212°C to 260°C) as in our Durlon® 9600 made with only pure PTFE resins. It is chemically inert, demonstrates low water absorption, and has excellent insulating capabilities in humid and high-temperature environments. PTFE does not exhibit cold flow and has strong resistance to compression set, which makes it suitable for high-pressure and chemically aggressive conditions such as those found in oil and gas processing.
What is an EPDM Membrane?
EPDM membranes are made of synthetic rubber and are utilized across several sectors. In the marine industry, they are used in boat seals and weatherproofing systems. EPDM is used as an insulating material in electrical engineering and as a component for seals, gaskets, O-rings, and hoses in the automotive sector. EPDM is known for its flexibility and resistance to oil and heat, making it an ideal material for components that must perform under elevated temperatures.
This material excels in outdoor environments due to its high resistance to ultraviolet radiation, ozone, and extreme weather conditions. The saturated polymer backbone of EPDM enhances its durability in hot water and steam, allowing it to maintain performance in industrial wastewater systems without significant degradation. EPDM also resists aging, preserving its structural integrity over extended periods.
What is a PTFE Membrane?
PTFE membranes are composed of a fluoropolymer structure in which carbon atoms are bonded to fluorine atoms, creating a stable and low-energy surface. This structure imparts self-lubricating properties and minimizes friction when in contact with other materials. PTFE also resists organic material accumulation and is highly impermeable due to its dense molecular structure.
PTFE is frequently employed in the food and beverage sector, where its non-reactive properties protect against product contamination. The material’s exceptional chemical resistance makes it a preferred choice in the pharmaceutical and petrochemical industries. PTFE membranes are capable of retaining their properties after long-term exposure to harsh substances. Their smooth surface, high porosity, and chemical stability allow them to efficiently filter gases, liquids, and corrosive chemicals under high pressure.
EPDM vs PTFE Gaskets: Which is Better?
When selecting between EPDM and PTFE gaskets, several criteria must be evaluated, including temperature tolerance, chemical compatibility, mechanical strength, sealing capability, dimensional requirements, regulatory compliance, and certification. EPDM gaskets are advantageous in applications involving exposure to harsh weather conditions, whereas PTFE gaskets are more appropriate in food production and chemically intensive environments.
Examples from the Durlon® PTFE gasket product line include:
Durlon® 9000: This gasket conforms to FDA requirements and has achieved numerous certifications: WRAS (Water Regulations Advisory Scheme) Approved Material, USP Class VI, FDA and (EC) 1935/2004 & EU (10/2011) compliant, TA-luft (VDI Guideline 2440), ABS-PDA & Pamphlet 95, the chlorine institute, DNV-GL. It has also passed the API 6FA fire test.
Durlon® 9200: Specifically developed for use in paper and pulp digesters and for applications involving aggressive chemicals such as caustics, hydrogen peroxide, sodium hypochlorite, and nitric acid.
The decision between EPDM and PTFE gaskets depends on the specific operating conditions and performance demands of the application. Each material offers distinct advantages that suit different environments and regulatory needs. Understanding the material properties and industry requirements is essential for selecting the most appropriate gasket.
Do you want to know more about EPDM vs PTFE gaskets? Contact us for information on the best gasket for your application.