Standard seals don’t survive heat. If your equipment operates over 120°C, you need better sealing materials—or risk leakage and costly failure.
A high temperature O ring kit built with Viton or PTFE prevents downtime by resisting heat, pressure, and chemicals in extreme environments.
This guide shows you exactly how to choose the right material, size, and kit for hot applications.
What material should you use for high temperature O rings?
O rings exposed to heat need more than flexibility—they need thermal endurance.
| Material | Temp Range | Heat Resistance | Chemical Resistance | Flexibility | Best Use |
|---|---|---|---|---|---|
| Viton | -20°C to +200°C | ★★★★☆ | ★★★★☆ | Flexible | Dynamic hot seals |
| PTFE | -200°C to +260°C | ★★★★★ | ★★★★★ | Rigid | Static heat sealing |
| Silicone | -60°C to +200°C | ★★★★☆ | ★★☆☆☆ | Very soft | Low-pressure systems |
| NBR | -40°C to +120°C | ★★☆☆☆ | ★★★☆☆ | Flexible | Non-thermal use |
Use Viton when sealing moving parts under pressure. For ultra-high temps in static equipment, go with PTFE.
Explore our FKM O Ring product page for more material options.
How hot can Viton O rings get before failing?
Viton handles continuous use up to 200°C (392°F).
It’s the go-to seal material in:
- Automotive and diesel engines
- Hydraulic systems with high-temp fluids
- Boiler and process lines
- Chemical plant piping
Many of our European clients in packaging machinery reported 80% fewer seal failures after switching to Viton.
For engine systems, check our Fuel Injector O Ring Kit.
Can you use high-temp O rings for steam sealing?
Yes, if they’re made from the right material:
- PTFE is best for static, high-pressure steam
- Viton works for wet steam up to 200°C
Avoid NBR in steam—it absorbs moisture and swells.
Need hot-water compatible hydraulic seals? View our Hydraulic O Ring Kit options.
Viton vs. PTFE: Which O ring performs better in heat?
| Feature | Viton | PTFE |
|---|---|---|
| Max Temp | 200°C | 260°C |
| Flexibility | High | Low (rigid) |
| Oil/Chemical Res. | Excellent | Superior |
| Dynamic Use | ✅ | ❌ (for static use) |
In moving parts or dynamic loads, Viton wins. In chemically harsh, stationary environments, PTFE lasts longer.
Can high temperature O rings be used in hydraulic systems?
Definitely. Heat-resistant seals like Viton are common upgrades in hydraulic pumps and valves.
Why?
- They handle synthetic fluids
- Maintain elasticity under load
- Reduce failures from heat cycling
Browse our O Ring Assortment Kits for OEM or retrofit uses.
Need help selecting the right standard? Check our metric vs. inch kit comparison.
What’s inside our high-temperature O ring kits?
We offer 2 pre-packed kits:
| Kit Type | Sizes | Cross-Sections | Material Options | Fits Equipment Made In |
|---|---|---|---|---|
| 382 PCS (Inch) | 30 | 1.78–5.33 mm | NBR / Viton | U.S., Japan |
| 428 PCS (Metric) | 30 | 1.50–3.00 mm | NBR / Viton | Europe, ISO/DIN-based markets |
Each kit includes:
- Durable, labeled plastic case
- Cross-section chart
- Ready-to-use stock for field repair
We also offer OEM kit builds with custom mix of Viton, NBR, and PTFE.
Conclusion
High-temperature O ring kits extend uptime in hot, high-pressure applications. Viton and PTFE seals give you sealing confidence—even when heat is the enemy.
Request a Quote or OEM Support
📩 Email: [email protected]
📱 WhatsApp: +86 17622979498
Related topic
High-Temperature Sealing: How to Prevent Failures in Extreme Conditions?
FKM O-Ring vs. NBR O-Ring: Which Is Best for Your Application?
O Ring Kit: What’s the Best Choice for Industrial and Automotive Applications?
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