Balanced industrial performance
CR is considered where tear resistance, weathering performance and moderate fluid resistance must be balanced in one material family.
CR (Neoprene) compound
Industrial polychloroprene rubber
A technical reference for Hamta Polymer CR compounds, also known as neoprene, from 40 to 90 Shore A. CR is commonly assessed when a balanced combination of weathering, ozone, tear resistance and inherent flame behaviour is important. Final material approval remains application-specific.
-40 to +120 C
Typical service temperature
6
Standard hardness grades
ASTM / ISO
Test references
Inherent
Ozone and flame behaviour
Inherent weather resistance
Ozone resistance is inherent to the polychloroprene polymer structure and supports outdoor-use evaluation without assuming suitability for every design.
Material selection remains specific
Oil swelling, temperature, flame requirements, storage conditions and the finished-part service profile require technical confirmation.
Hamta Polymer CR (Neoprene) general specifications
Chemical namePolychloroprene rubber
Standard designationCR (ASTM D1418); neoprene is a commonly used market name
Available hardness range40 to 90 Shore A
Typical continuous service range-40 to +120 C, depending on compound and application
Ozone resistanceInherent polymer-level resistance; validate the finished part for its environment
Flame behaviourSelf-extinguishing behaviour may be available by compound; requirements need specification review
ColourBlack or dark grey; custom colours subject to agreement
Specific gravity1.23 to 1.35 g/cm3, depending on formulation and hardness
Technical datasheet
CR (Neoprene) 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 | >= 16.0 | ASTM D412 / ISO 37 |
| Elongation at break | EB | % | >= 300 | ASTM D412 / ISO 37 |
| 100% modulus | M100 | MPa | 3.0-6.0 | ASTM D412 / ISO 37 |
| Tear resistance | TR | kN/m | >= 48 | ASTM D624 / ISO 34 |
| Compression set (70 C / 24 h) | CS | % | 22-35 | ASTM D395-B / ISO 815 |
| Resilience | R | % | 33-46 | ISO 4662 |
| Specific gravity | rho | g/cm3 | 1.29 +/- 0.03 | ASTM D792 / ISO 2781 |
| Abrasion resistance | Abr | mm3 | <= 115 | ISO 4649 |
| Oil swelling (IRM 903, 70 C / 70 h) | delta V | % | +12 to 24 | ASTM D471 / ISO 1817 |
| Typical service temperature | T | C | -35 to +120 | - |
CR (Neoprene) 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.
Weather and ozone exposure
Ozone, sunlight and general weatheringExcellent
Outdoor environmental exposureExcellent
Water and selected industrial media
Water and aqueous media within reviewed conditionsGood
Selected dilute acids and basesGood
Oils and hydrocarbons
Moderate mineral-oil exposure subject to compound reviewFair
Hydrocarbon fuels and aromatic oilsPoor
Solvents
Ketones and strong polar solventsPoor
Aggressive oxidising chemicalsPoor
Excellent
Good
Fair
Poor
Technical notes and limitations
1
Values are typical laboratory guidance for the stated methods. Finished-part results can vary with formulation, cure, geometry and production conditions.
2
The neoprene name is retained as a common market term. CR remains the shared technical material code used in standards and the datasheet.
3
Self-extinguishing behaviour is not a replacement for a specified fire-performance requirement. The relevant standard, compound and finished assembly must be reviewed.
4
Temporary low-temperature crystallisation can affect storage handling. Restore the material to ambient conditions and assess the part under its actual service requirements.
Where is CR (Neoprene) 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 a CR grade?
Share the medium, temperature range, weather exposure, flame requirement, dimensions and target quantity with Hamta Polymer for an application-specific discussion.