Blend-led tuning
NR/SBR ratio, filler system and cure design are tuned to the required balance of dynamic response, abrasion and cost.
NR/SBR blend
Industrial natural-rubber and SBR blend
A technical reference for Hamta Polymer NR/SBR blend compounds from 40 to 90 Shore A. The blend is evaluated when an application needs a practical balance of NR resilience and SBR abrasion behaviour. Blend ratio and reinforcement are selected for the final duty.
-50 to +95 C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
Balanced
Resilience / abrasion
Industrial applications
It is assessed for general mechanical components where neither pure NR nor pure SBR alone is the preferred balance.
Environmental confirmation
Oil, weathering and heat resistance must be checked against the exact finished-part service conditions.
Hamta Polymer NR/SBR general specifications
Chemical nameNatural-rubber / styrene-butadiene rubber blend
Technical designationNR/SBR blend
Available hardness range40 to 90 Shore A
Typical blend ratioApplication-specific NR/SBR ratio
Typical service range-50 to +95 C, depending on compound and application
Specific gravityApprox. 1.10 to 1.20 g/cm3, depending on formulation
Technical datasheet
NR/SBR 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 | ≥ 20.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | ≥ 400 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 2.5 – 4.5 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | ≥ 45 | ASTM D624 / ISO 34 |
| Compression set | CS | % | 14 – 22 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 52 – 62 | ISO 4662 |
| Recorded technical property | ρ | g/cm³ | 1.16 +/- 0.02 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm³ | ≤ 95 | ISO 4649 |
| Hardness change after ageing | ΔH | point | +4 to +9 | ASTM D573 / ISO 188 |
| Typical service temperature | T | °C | -30 ~ +85 | - |
NR/SBR 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
General dynamic industrial dutiesGood
Abrasion-focused designsGood
Water and aqueous media
Water and selected aqueous mediaGood
Dilute acids and basesFair
Weather exposure
Ozone and UV without protective designPoor
Outdoor weathering without protectionPoor
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
The NR/SBR ratio is application-specific. Do not infer final behaviour from the blend name without reviewing the required dynamic, abrasion and environmental conditions.
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/SBR 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/SBR grade?
Share the load cycle, abrasion conditions, temperature and target quantity with Hamta Polymer for an application-specific discussion.