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High-Performance HNBR (HSN) O-Rings & Sealing Solutions
Engineered for Extreme Environments: Superior Heat, Oil, and Chemical Resistance for Critical Industrial Applications.
- Extended Temperature Range: Reliable performance from -40°C to +150°C (-40°F to +302°F).
- Exceptional Durability: High tensile strength and superior abrasion resistance.
- Chemical Stability: Optimized for R134a refrigerants, sour gas (H2S), and petroleum fluids.
Why Choose HNBR (Hydrogenated Nitrile) for Critical Sealing?
Hydrogenated Nitrile Butadiene Rubber (HNBR), also known as Highly Saturated Nitrile (HSN), is a specialized polymer produced through the selective hydrogenation of the NBR butadiene groups. This chemical refinement results in a material that bridges the performance gap between standard Nitrile and high-cost Fluorocarbon (Viton™) elastomers.
For engineers and procurement specialists, HNBR offers a cost-effective yet high-performance solution for applications where standard NBR fails due to thermal degradation or ozone exposure. Its “highly saturated” backbone provides exceptional resistance to heat, oxidative aging, and mechanical stress.
Technical Specifications of HNBR O-Rings
| Property | Standard Range | Test Method |
|---|---|---|
| Hardness | 50 – 90 Shore A | ASTM D2240 |
| Tensile Strength | 15 – 25 MPa | ASTM D412 |
| Elongation at Break | 200% – 500% | ASTM D412 |
| Temperature Range | -40°C to +150°C | Service Limit |
| Compression Set | < 20% (70h @ 150°C) | ASTM D395 |
Key Applications Across Industries
Oil & Gas
In downhole environments, HNBR O-rings are essential for sealing against sour gas (H2S), crude oil, and high-pressure steam. Their resistance to explosive decompression (ED) ensures long-term reliability in BOPs and packers.
Automotive
HNBR is the preferred material for automotive air conditioning systems using R134a or R1234yf refrigerants. It also excels in timing belts, fuel injection systems, and engine seals.
Industrial Hydraulics
For heavy-duty hydraulic cylinders and pumps, the superior abrasion resistance of HNBR prevents premature seal failure under high-velocity fluid flow and elevated temperatures.
Frequently Asked Questions (FAQ)
What is the main difference between HNBR and NBR?
HNBR is the hydrogenated version of NBR. This process removes the double bonds in the polymer chain, significantly increasing its resistance to heat, ozone, and chemicals while maintaining the oil resistance of NBR.
Is HNBR compatible with R134a refrigerant?
Yes, HNBR is specifically engineered for compatibility with R134a and newer refrigerants, making it the standard choice for automotive A/C systems.
Can HNBR be used in steam applications?
HNBR offers good resistance to steam and hot water up to 150°C, outperforming NBR and many other elastomers in these conditions.