Rubber o rings may seem simple, but the wrong material could cause a leak, a breakdown—or even a safety hazard.
Whether you’re sealing hydraulic valves, fuel lines, water pipes, or industrial machines, having a versatile rubber o ring kit means you’re always prepared. But not all rubber is created equal.
Let’s look at the most common rubber o ring materials, their applications, and how to choose the right kit for your needs.
What is a rubber o ring kit used for?
A rubber o ring kit is used for sealing mechanical joints in everything from automotive engines to plumbing and pumps.
These kits include multiple sizes of elastomeric o rings, used to prevent fluid or gas leaks. They’re essential in:
- Hydraulic and pneumatic systems
- Plumbing maintenance
- Automotive repair
- Manufacturing and assembly lines
- Industrial machinery
Many technicians keep kits with NBR or Viton rubber o rings on-site for fast replacement.
What materials are used in rubber o rings?
Rubber o rings can be made from several elastomers, each suited for different fluids, temperatures, and pressures.
The most common include:
| Material | Full Name | Temp Range | Chemical Resistance | Flexibility | Cost |
|---|---|---|---|---|---|
| NBR | Nitrile Rubber | -40°C to +120°C | Oils, fuel, water | High | ★☆☆☆☆ |
| Viton | Fluoroelastomer | -20°C to +200°C | Fuel, solvents, heat | Medium | ★★★☆☆ |
| Silicone | Silicone Rubber | -60°C to +200°C | Air, water, food | Very High | ★★☆☆☆ |
We offer rubber o ring kits in all three materials.
What’s the difference between NBR, Viton, and Silicone?
NBR is ideal for oil/fuel sealing at standard temperatures.
Viton offers chemical and high-heat resistance.
Silicone excels in food-grade and low-pressure environments.
| Feature | NBR | Viton | Silicone |
|---|---|---|---|
| Heat Resistance | Good (120°C) | Excellent (200°C) | Excellent (200°C) |
| Oil Resistance | High | Very High | Low |
| Compression Set | Moderate | Low | High |
| Price | Low | Medium-High | Medium |
👉 Want more detail on high-temp use?
Read our Viton O Ring Guide
How do I know which rubber o ring to use?
Choose based on:
- Medium (oil, water, fuel, chemical)
- Temperature range
- Application type (dynamic vs static)
For example:
- Plumbing: NBR
- Automotive fuel systems: Viton
- Food-grade dispensers: Silicone
Still unsure? Start with a kit that includes NBR and upgrade to Viton if needed.
What sizes are included in a rubber o ring kit?
Our kits include 30 popular sizes for inch or metric standards.
| Kit Type | Sizes | ID Range | Cross Sections | Material Options |
|---|---|---|---|---|
| 382 PCS Inch Kit | 30 | 2.90 – 43.82mm | 1.78 – 5.33 mm | NBR / Viton / Silicone |
| 428 PCS Metric | 30 | 3.00 – 48.50mm | 1.50 – 3.00 mm | NBR / Viton / Silicone |
All kits come in durable plastic boxes with labels, ideal for repair kits or on-site maintenance.
Learn which kit type fits your system →
Are rubber o rings good for water, fuel, or high heat?
Yes, depending on the material:
- Water → NBR or Silicone
- Fuel/Oil → Viton or NBR
- High heat → Viton or Silicone
If your application involves all three—get Viton.
You can also check our High Temp Kit for more aggressive conditions.
Where to buy a rubber o ring kit with OEM packaging?
Right here. At Hengoseal, we offer:
- ✅ Custom size + material combos
- ✅ Branded labels + outer cartons
- ✅ MOQ starting from 100 kits
- ✅ Fast shipping worldwide
Conclusion
With the right rubber o ring kit, you can stop leaks before they start. Whether you need oil resistance, high heat durability, or food-safe elastomers—we’ve got a kit for that.
Request a Sample or Quote
Need rubber o ring kits with OEM branding, fast delivery, or mixed material sets?
📩 Email: [email protected]
📱 WhatsApp: +86 17622979498
Let’s find the perfect kit for your market.
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