Balanced mechanical behaviour
NBR is commonly considered where tensile strength, abrasion resistance and flexibility must be balanced for an industrial rubber part.
NBR compound
Industrial nitrile rubber
A technical reference for Hamta Polymer NBR compounds across standard hardness grades from 40 to 90 Shore A. The values shown are intended to support an initial engineering discussion; final selection depends on the fluid, temperature, geometry and service conditions of the finished part.
−30 to +100 °C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
40–90 Shore A
Hardness range
Formulation-led selection
Acrylonitrile content, curing system and hardness grade affect low-temperature behaviour, oil resistance and the mechanical response of the compound.
Application review first
Selection should be confirmed against the actual fluid, temperature cycle, pressure, motion and required part geometry rather than the material code alone.
Hamta Polymer NBR general specifications
Chemical nameAcrylonitrile-butadiene rubber
Standard designationNBR (ASTM D1418)
Available hardness range40 to 90 Shore A
Acrylonitrile content18% to 45% (typical medium grade: 33%)
Typical compound service range−30 to +110 °C (special grades may differ)
ColourBlack; other colours subject to agreement
Specific gravity1.18 to 1.35 g/cm³, depending on formulation
Technical datasheet
NBR datasheet by hardness
Choose a hardness grade to view the recorded mechanical properties, units and test references.
| Property | Symbol | Unit | Value | Standard |
|---|---|---|---|---|
| Hardness | H | Shore A | 70 ± 5 | ASTM D2240 / ISO 7619 |
| Tensile strength | TS | MPa | ≥ 15.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | ≥ 350 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 2.5–5.0 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | ≥ 45 | ASTM D624 / ISO 34 |
| Compression set (70 °C / 24 h) | CS | % | 25–38 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 42–52 | ISO 4662 |
| Specific gravity | ρ | g/cm³ | 1.25 ± 0.03 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm³ | ≤ 120 | ISO 4649 |
| Volume change in oil (70 °C / 70 h) | AV | % | −5 to +8 | IRM 903 / ISO 1817 |
| Typical service temperature | T | °C | −30 to +100 | — |
NBR chemical-resistance guidance
This is an orientation aid, not a final compatibility approval. Confirm the specific medium, concentration, temperature and exposure cycle with the technical team.
Mineral oils and greases
Mineral oils for engines, hydraulics and gearboxesExcellent
Petroleum-based hydraulic oilsExcellent
Hydrocarbon fuels and aqueous media
Hydrocarbon fuels such as petrol and dieselGood
Water and aqueous solutions up to 80 °CGood
Dilute acids, bases and weather exposure
Dilute acids and basesFair
Ozone, sunlight and general weatheringFair
Polar solvents and chlorinated fluids
Polar solvents, including acetone and ketonesPoor
Chlorinated fluids and aggressive solventsPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Published values are typical laboratory guidance for the stated test methods and are not a specification for every finished part.
2
Hardness and mechanical performance can change with formulation, curing system, geometry and the production batch.
3
Compression set, fluid exposure and temperature resistance should be checked against the actual service cycle before final material approval.
4
Where higher temperature, aggressive-fluid or severe dynamic performance is required, the application should be reviewed for a more suitable elastomer family such as HNBR or FKM.
Where is NBR considered in our product range?
These product families can be explored from the English product hub. Suitability is determined by the final application, not by the material code alone.
Need help selecting an NBR grade?
Share the fluid, temperature range, pressure, motion, dimensions and target quantity with the Hamta Polymer team for an application-specific discussion.