Dynamic performance
NR is assessed for parts where elastic rebound, fatigue behaviour and repeated deformation are central to the intended service.
NR compound
Industrial natural rubber
A technical reference for Hamta Polymer NR compounds from 30 to 80 Shore A. Natural rubber is often considered for high resilience, fatigue resistance and dynamic deformation, subject to its limits in weathering, ozone and oil environments.
-50 to +80 C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
High
Resilience
Mechanical balance
Strain crystallisation contributes to its characteristic tensile and fatigue response under suitable compound and loading conditions.
Environmental limits
Oil, ozone, UV and weather exposure require protective design or another material-family assessment.
Hamta Polymer NR general specifications
Chemical nameNatural cis-1,4-polyisoprene
Standard designationNR (ASTM D1418)
Available hardness range30 to 80 Shore A
Typical service range-50 to +80 C, depending on compound and application
ResilienceHigh dynamic rebound profile
Specific gravity1.10 to 1.19 g/cm3, depending on formulation
Technical datasheet
NR 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 | 60 +/- 5 | ASTM D2240 / ISO 7619 |
| Tensile strength | TS | MPa | ≥ 22.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | ≥ 500 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 1.5 – 3.2 | ASTM D412 / ISO 37 |
| 300% modulus | M300 | MPa | 4.0 – 8.0 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | ≥ 55 | ASTM D624 / ISO 34 |
| Compression set | CS | % | 10 – 18 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 62 – 78 | ISO 4662 |
| Recorded technical property | ρ | g/cm³ | 1.15 +/- 0.03 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm³ | ≤ 130 | ISO 4649 |
| Recorded technical property | — | kc | ≥ 600 | ASTM D430 / ISO 132 |
| Typical service temperature | T | °C | -60 ~ +80 | - |
NR 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.
Dynamic mechanical service
Repeated deformation under reviewed loadExcellent
High-resilience component designsExcellent
Water and aqueous media
Water and selected aqueous mediaGood
Dilute acids and basesFair
Weather exposure
Ozone and UV without protectionPoor
Outdoor weathering without protective designPoor
Oil and solvents
Mineral oils and hydrocarbon fuelsPoor
Aggressive solventsPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Values are typical laboratory guidance for the stated test methods. Finished-part results can vary with formulation, cure, geometry and production conditions.
2
High resilience does not override environmental limitations. Confirm ozone, UV, oil and temperature conditions for the actual finished part.
3
Material selection must be confirmed against the actual medium, temperature cycle, load, motion and relevant product requirements before final approval.
4
Material codes, numerical values, units and standards are shared technical identifiers; the explanatory English copy is authored for this page.
Where is NR 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 NR grade?
Share the load cycle, temperature, environment, dimensions and target quantity with Hamta Polymer for an application-specific discussion.