A tougher, hotter, more weather-resistant upgrade to NBR
Built for oils/fuels, higher temps, and strong mechanical loads.
| Feature | Details |
|---|---|
| Also called | HNBR, HSN |
| Typical service temp | –40°F to +300°F (–40°C to +150°C) — low-temp grades down to –55°F, some to –67°F |
| Durometer range | 50–90 Shore A (common: 70/80/90A) |
| Core strengths | Oil/fuel resistance, heat/ozone/weathering, abrasion/tear, compression set |
| Cure systems | Peroxide (standard, better heat/CS) • Sulfur (more flexible for dynamic; lower heat/CS) |
| Shelf life | ~15 years (AS5316 guidance) |
| Actual limits vary by compound and media—verify in your service conditions. | |
BEST FOR
- ✔ Petroleum oils & fuels, aliphatic hydrocarbons
- ✔ R134a and other refrigerants; ethylene glycol coolants
- ✔ Water/steam up to ~300°F (150°C)
- ✔ Dilute acids/bases/salt solutions (moderate temps)
- ✔ Need higher temperature + mechanical strength than NBR
Not For
- ✘ Chlorinated hydrocarbons
- ✘ Ketones, esters, ethers
- ✘ Strong acids (concentrated)
Popular HNBR Options
- General-purpose heat/chemical-resistant: 70A / 80A / 90A (black or green)
- Low-temperature options; RGD-resistant 90A grades
Inch (AS568) and metric sizes. Custom sizes and colors on request.
Engineering Notes
- Hydrogenation of NBR saturates the backbone → boosts heat, ozone, and mechanical performance.
- ACN content (≈17–49%) trade-off: lower ACN = better low-temp; higher ACN = better fuel/polar-lube resistance. Typical ~36%.
- Peroxide-cured HNBR dominates high-temp service; sulfur-cured can help dynamic flexibility (with heat/CS trade-offs).
- Applications:
- Hydraulic & fuel systems • Oil & gas (RGD-resistant grades available) • Industrial pumps/valves • Under-hood automotive • General machinery.