Choosing the right material can be confusing when both are called “rubber” but have very different properties. EPDM and PTFE are two popular materials for seals, gaskets, and hoses, but they serve very different needs.
EPDM is a synthetic rubber known for weather, steam, and ozone resistance. PTFE (often called Teflon®) is a fluoropolymer, not a true rubber, famous for chemical resistance, non-stick properties, and high heat tolerance.
I have worked with both materials in a wide range of sealing projects—each one shines in its own specialty.
What Is EPDM Rubber?
EPDM stands for Ethylene Propylene Diene Monomer. It’s a flexible, black synthetic rubber that resists weather, water, steam, UV, and ozone. It is widely used for outdoor gaskets, hoses, roofing membranes, and automotive seals.
EPDM rubber stays soft and elastic over time. It’s ideal for outdoor and water applications, but does not resist oils, fuels, or most solvents well.
🛠️ EPDM Key Features
| Property | EPDM Performance |
|---|---|
| Flexibility1 | Excellent |
| Weather/Ozone Resistance2 | Outstanding |
| Water/Steam Resistance | Outstanding |
| Chemical Resistance3 | Good (water-based) |
| Oil/Fuel Resistance | Poor |
| Max Temperature4 | ~130°C (266°F) |
| Cost5 | Low to moderate |
What Is PTFE Rubber?
PTFE stands for Polytetrafluoroethylene, best known under the brand name Teflon®. Technically, PTFE is not an elastomer or true rubber, but a fluoropolymer plastic. It is extremely resistant to almost all chemicals, has a slippery non-stick surface, and withstands very high temperatures.
PTFE is used for seals, gaskets, valve seats, and liners in chemical, food, and pharmaceutical industries—especially where extreme temperatures or aggressive chemicals are present.
🛠️ PTFE Key Features
| Property | PTFE Performance |
|---|---|
| Flexibility1 | Limited, more rigid than rubber |
| Chemical Resistance3 | Outstanding (almost universal) |
| Weather/Ozone Resistance2 | Excellent |
| Water/Steam Resistance | Excellent |
| Oil/Fuel Resistance | Excellent |
| Max Temperature4 | ~260°C (500°F) |
| Non-Stick Surface6 | Yes |
| Cost5 | Higher |
EPDM vs PTFE: Property Comparison Table
| Property | EPDM Rubber | PTFE (Teflon®) |
|---|---|---|
| Flexibility | High, soft, elastic | Low, rigid, plasticky |
| Chemical Resistance | Good (water-based) | Excellent (almost all) |
| Oil/Fuel Resistance | Poor | Excellent |
| Weather Resistance | Outstanding | Excellent |
| Max Temp. | ~130°C (266°F) | ~260°C (500°F) |
| Cost | Lower | Higher |
| Common Uses | Gaskets, hoses, roofs | Chemical seals, valve seats, non-stick liners |
When to Use EPDM vs When to Use PTFE?
- Use EPDM7: For outdoor, water, steam, and general sealing jobs where cost, flexibility, and weathering are key.
- Use PTFE8: For high-temperature, high-chemical, non-stick, or food-grade sealing jobs where nothing else survives.
I always match the material to the real-world conditions—choosing EPDM for flexibility and weather, and PTFE for chemical and heat extremes.
My Tips for Choosing Between EPDM and PTFE
- Always check what chemicals, temperatures, and pressures are involved
- Use EPDM where flexibility and outdoor durability matter most
- Use PTFE for harsh chemicals, oils, fuels, or high temperatures
- PTFE is not a true rubber—it’s a plastic, so consider installation needs
Conclusion
EPDM and PTFE are both excellent, but for very different reasons. EPDM is the go-to for flexible, weatherproof seals. PTFE excels when you need unbeatable chemical and heat resistance. Always choose based on the specific job requirements.
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Understanding flexibility can guide you in selecting materials that meet specific performance requirements. ↩ ↩
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Exploring this topic can provide insights into material longevity and suitability for outdoor applications. ↩ ↩
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Understanding chemical resistance can help you choose the right materials for your applications, ensuring safety and durability. ↩ ↩
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Knowing the max temperature ratings helps in selecting materials that can withstand extreme conditions without failure. ↩ ↩
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Exploring material costs can help you make informed decisions that balance quality and budget constraints. ↩ ↩
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Discover how non-stick surfaces can enhance efficiency and reduce maintenance in various industries. ↩
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Explore this link to understand the best applications for EPDM, ensuring you make informed choices for your sealing needs. ↩
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Discover the benefits of PTFE in sealing applications, especially for high-temperature and chemical resistance, to enhance your project outcomes. ↩
