O-Rings by Material
HNBR O-Rings (Hydrogenated Nitrile)
HNBR is NBR with its polymer backbone saturated by hydrogenation — this eliminates the double bonds that make NBR vulnerable to heat, ozone, and chemical attack, extending service life in demanding applications.
Properties
Key Properties
| Property | Value |
|---|---|
| Temperature Range | −30 °C to +150 °C |
| Hardness Range | 55 to 90 Shore A (70–80 Shore A typical) |
| Resists | Petroleum oils (better than NBR at higher temps), ozone, refrigerants (R134a, R1234yf), sour gas (H₂S), amine-containing oils |
| Avoid | Polar solvents (ketones, esters), strong oxidizing acids, brake fluid (glycol-based) |
| Typical Applications | Automotive (timing belt tensioners, fuel injection), oil & gas (sour service), refrigeration (R134a systems), industrial hydraulics at elevated temperature |
| Available Standards | AS568, ISO 3601, NACE MR0175 (sour gas), SAE J2236 |
For a complete material data sheet, see the full HNBR O-Rings material page.
Sizes
Available Sizes
FITCO manufactures HNBR O-Rings in all standard AS568 and metric sizes — from AS568-001 (0.74 mm ID) through AS568-475 (633.48 mm ID), plus metric sizes per ISO 3601, JIS B2401, and BS 1806.
- Standard durometers in stock
- Custom compounds and special durometers on request
- Cord stock available for field-cut rings
- Typical lead time: ex-stock for standard sizes, 2–4 weeks for custom
Resources
Related Pages
Full Material Data
Complete technical data sheet with chemical compatibility, compression set, and physical properties.
O-Ring Size Charts
AS568, Metric, JIS, BS, GB/T size tables with ID, OD, and cross-section dimensions.
Chemical Compatibility
Check material compatibility with your specific fluid or chemical environment.