Choosing the right oil seal material is the single most important decision when sourcing seals. The wrong material can fail within weeks, while the right one can run for years without leakage. In this guide, we compare the three most common materials — **NBR, FKM and Silicone** — so you can pick the correct one for your application.
### 1. NBR (Nitrile Butadiene Rubber) — The Industry Standard
NBR is the most widely used oil seal material in the world, covering roughly 70% of general applications.
| Property | Performance |
|----------|-------------|
| Temperature range | -40°C to +120°C |
| Oil resistance | Excellent |
| Wear resistance | Good |
| Cost | Low |
**Best for:** automotive engines, gearboxes, general machinery, hydraulic systems.
**Limitation:** NBR swells and cracks in high-temperature environments above 120°C, and it is not suitable for exposure to ozone, strong acids or brake fluid.
### 2. FKM / Viton (Fluoroelastomer) — The High-Performance Option
FKM is the go-to material when NBR cannot survive the working conditions.
| Property | Performance |
|----------|-------------|
| Temperature range | -20°C to +200°C |
| Oil & chemical resistance | Outstanding |
| Wear resistance | Excellent |
| Cost | 3–5× higher than NBR |
**Best for:** high-temperature engines, chemical processing equipment, food-grade machinery (special grades), heavy-duty trucks and construction machinery.
### 3. Silicone (VMQ) — The Extreme Temperature Specialist
Silicone seals handle the widest temperature range but sacrifice mechanical strength.
| Property | Performance |
|----------|-------------|
| Temperature range | -60°C to +230°C |
| Oil resistance | Moderate |
| Wear resistance | Poor |
| Cost | Medium-high |
**Best for:** food equipment, medical devices, electrical appliances, and very cold environments.
### Quick Selection Cheat Sheet
- **Standard engine or gearbox application?** → NBR (lowest cost, fully sufficient)
- **Temperature above 120°C or aggressive fluids?** → FKM
- **Freezer equipment or food contact?** → Silicone
- **Still not sure?** → Send NTO your application details and we will recommend the right material with a free sample for testing.
### Conclusion
For most buyers, **NBR offers the best value**, FKM is worth the premium in harsh conditions, and silicone solves niche temperature problems. As a professional oil seal manufacturer and exporter, NTO supplies all three materials in TC, TCN, TCD, TB and custom designs.
**Need help choosing? [Contact us](https://www.ntooilseal.com/contact) for a free consultation and sample.**