Three-phase balance
NR, SBR and PBR proportions are set to balance resilience, abrasion and heat build-up for the required duty.
NR/SBR/PBR blend
Industrial ternary elastomer blend
A technical reference for Hamta Polymer NR/SBR/PBR ternary-blend compounds from 40 to 90 Shore A. The three-phase blend is evaluated when rebound behaviour, abrasion response and controlled heat build-up must be balanced for a specified industrial application.
-55 to +100 C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
High
Resilience
Dynamic assessment
The blend is relevant to dynamic components only after load, temperature, frequency and deformation are reviewed together.
Compound-specific result
A ternary blend name is not a finished specification; final performance depends on the formulated grade and process conditions.
Hamta Polymer NR/SBR/PBR general specifications
Chemical nameNatural-rubber / styrene-butadiene / polybutadiene ternary blend
Technical designationNR/SBR/PBR (also NR/SBR/BR)
Available hardness range40 to 90 Shore A
Typical blend ratioApplication-specific three-phase ratio
Typical service range-55 to +100 C, depending on compound and application
Specific gravityApprox. 1.10 to 1.20 g/cm3, depending on formulation
Technical datasheet
NR/SBR/PBR 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 | ≥ 19.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | ≥ 350 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 2.5 – 4.5 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | ≥ 42 | ASTM D624 / ISO 34 |
| Compression set | CS | % | 12 – 20 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 57 – 67 | ISO 4662 |
| Recorded technical property | ρ | g/cm³ | 1.16 +/- 0.02 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm³ | ≤ 78 | ISO 4649 |
| Hardness change after ageing | ΔH | point | +4 to +8 | ASTM D573 / ISO 188 |
| Typical service temperature | T | °C | -30 ~ +90 | - |
NR/SBR/PBR 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
High-rebound industrial component designsExcellent
Abrasion-focused service under reviewed loadGood
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/PBR ratio is adjusted for each application. Validate heat build-up, fatigue, abrasion and environmental exposure on the actual product design.
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/PBR 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/PBR grade?
Share the load cycle, temperature, abrasion conditions and target quantity with Hamta Polymer for an application-specific discussion.