Overview
CR (Chloroprene Rubber), commonly known by the trade name Neoprene®, is a versatile synthetic elastomer that provides an excellent balance of weather resistance, ozone resistance, flame resistance, oil resistance, mechanical strength, and flexibility.
CR was one of the first commercially successful synthetic rubbers and remains widely used in industrial, automotive, marine, electrical, and construction applications. Its unique combination of environmental durability and moderate oil resistance makes it a preferred material when both outdoor exposure and mechanical performance are required.
CR is widely used in:
- Automotive Sealing Systems
- Marine Equipment
- HVAC Components
- Industrial Gaskets
- Electrical Insulation
- Construction Products
- Protective Equipment
- Vibration Isolation Systems
Due to its balanced performance profile, CR is often selected as a general-purpose engineering rubber for demanding environments.
Material Specification
| Property | Value |
|---|---|
| Material Designation | CR |
| Full Name | Chloroprene Rubber |
| Common Name | Neoprene Rubber |
| Material Family | Synthetic Rubber Elastomer |
| Density | 1.20–1.50 g/cm³ |
| Appearance | Black, White, Gray, Colored |
| Hardness Range | Shore A 20–95 |
| Typical Manufacturing Methods | Compression Molding, Injection Molding, Extrusion |
| Standard Forms | Sheets, Rolls, Tubes, Profiles, Molded Parts |
Chemical Composition
CR is produced by polymerizing chloroprene monomers.
| Component | Function |
|---|---|
| Chloroprene Polymer | Elastic Matrix |
| Carbon Black | Reinforcement |
| Metal Oxides | Curing System |
| Plasticizers | Flexibility Enhancement |
| Additives | Processing & Performance Optimization |
The chlorine atoms within the polymer structure contribute significantly to weather and flame resistance.
Common CR Grades
| Grade | Characteristics |
|---|---|
| General Purpose CR | Standard Industrial Applications |
| Soft CR | Flexible Sealing Applications |
| Hard CR | Mechanical Components |
| Closed-Cell CR | Thermal Insulation & Buoyancy |
| Flame Retardant CR | Fire Safety Applications |
| Marine Grade CR | Saltwater Resistance |
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 8–25 MPa |
| Elongation at Break | 200–600% |
| Tear Strength | 15–45 kN/m |
| Compression Set | Good |
| Hardness | Shore A 20–95 |
| Impact Resistance | Good |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Abrasion Resistance | Good |
| Flexibility | Excellent |
| Tear Resistance | Good |
| Fatigue Resistance | Good |
CR provides dependable performance across a wide range of industrial applications.
Physical Properties
| Property | Value |
|---|---|
| Density | 1.20–1.50 g/cm³ |
| Water Absorption | Very Low |
| Thermal Conductivity | 0.20–0.35 W/m·K |
| UV Resistance | Excellent |
| Ozone Resistance | Excellent |
CR maintains its properties under prolonged outdoor exposure.
Thermal Properties
| Property | Value |
|---|---|
| Continuous Service Temperature | -40°C to 120°C |
| Premium Grades | Up to 135°C |
| Short-Term Temperature Resistance | Up to 150°C |
| Brittleness Temperature | Below -45°C |
CR performs reliably in moderate-temperature industrial environments.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| CR | 1.35 | 18 MPa |
| EPDM | 1.10 | 12 MPa |
| NBR | 1.20 | 18 MPa |
| Silicone | 1.20 | 8 MPa |
CR provides a strong balance between environmental durability and mechanical performance.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Water | Excellent |
| Salt Water | Excellent |
| Dilute Acids | Good |
| Dilute Alkalis | Good |
| Refrigerants | Excellent |
| Alcohols | Good |
| Petroleum Oils | Moderate |
| Fuels | Moderate |
| Strong Oxidizers | Poor |
CR offers broader chemical resistance than many general-purpose elastomers.
Weather & UV Resistance
| Property | Performance |
|---|---|
| UV Resistance | Excellent |
| Ozone Resistance | Excellent |
| Outdoor Durability | Excellent |
| Weather Aging Resistance | Excellent |
CR is frequently used in long-term outdoor applications.
Water & Marine Resistance
| Property | Performance |
|---|---|
| Fresh Water Resistance | Excellent |
| Salt Water Resistance | Excellent |
| Moisture Resistance | Outstanding |
| Marine Durability | Excellent |
Its resistance to seawater makes CR a preferred material in marine applications.
Flame Resistance
| Property | Performance |
|---|---|
| Self-Extinguishing | Yes |
| Flame Resistance | Good |
| Smoke Generation | Low |
| Fire Safety Performance | Good |
CR naturally exhibits better flame resistance than many hydrocarbon-based elastomers.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹² Ω·cm |
| Dielectric Strength | 12–20 kV/mm |
| Dielectric Constant | 6–8 |
| Arc Resistance | Good |
CR is commonly used for cable jackets and insulation components.
Compression Set Resistance
| Property | Performance |
|---|---|
| Seal Retention | Good |
| Compression Recovery | Good |
| Long-Term Gasket Performance | Good |
| Elastic Stability | Good |
Suitable for static and moderate dynamic sealing systems.
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Compression Molding | Outstanding |
| Injection Molding | Excellent |
| Extrusion | Outstanding |
| Transfer Molding | Excellent |
| Foam Processing | Outstanding |
CR can be manufactured as both solid rubber and sponge foam materials.
International Equivalent Standards
| Standard | Equivalent |
|---|---|
| ASTM D2000 | CR |
| ISO | Chloroprene Rubber |
| DIN | CR-Kautschuk |
| JIS | Chloroprene Rubber |
| GB/T (China) | 氯丁橡胶 |
| UL | Flame Retardant Grades Available |
Available Forms
| Product Type | Availability |
|---|---|
| Sheets | Yes |
| Rolls | Yes |
| Tubes | Yes |
| Gaskets | Yes |
| Extruded Profiles | Yes |
| Sponge Foam | Yes |
| Molded Parts | Yes |
Typical Applications
Automotive Industry
- Weather Seals
- Suspension Boots
- HVAC Components
- Vibration Dampers
Marine Industry
- Wetsuits
- Dock Fenders
- Marine Gaskets
- Water Seals
Construction Industry
- Expansion Joint Seals
- Window Gaskets
- Structural Isolation Pads
- Vibration Control Components
Electrical Industry
- Cable Jackets
- Connector Protection
- Insulation Components
HVAC Industry
- Air Duct Seals
- Vibration Mounts
- Flexible Connectors
Industrial Equipment
- Gaskets
- Protective Covers
- Flexible Couplings
- O-Rings
Advantages
Excellent Weather Resistance
Outstanding resistance to UV, ozone, and environmental aging.
Good Oil Resistance
Provides better oil resistance than EPDM.
Inherent Flame Resistance
Offers improved fire performance compared with many general-purpose elastomers.
Excellent Water Resistance
Ideal for outdoor and marine applications.
Good Mechanical Strength
Reliable performance in industrial environments.
Versatile Material
Suitable for a wide range of engineering applications.
Limitations
Lower Oil Resistance Than NBR
Not recommended for prolonged immersion in fuels or oils.
Moderate Temperature Capability
Cannot match the heat resistance of Silicone or FKM.
Higher Cost Than EPDM
Typically more expensive than EPDM compounds.
Limited Chemical Resistance
Not suitable for highly aggressive chemical environments.
Comparison with Common Elastomers
| Property | CR | EPDM | NBR | Silicone |
|---|---|---|---|---|
| Weather Resistance | Excellent | Outstanding | Poor | Outstanding |
| Oil Resistance | Moderate | Poor | Outstanding | Moderate |
| Flame Resistance | Good | Moderate | Moderate | Good |
| Water Resistance | Excellent | Outstanding | Good | Outstanding |
| Cost | Moderate | Low | Low | High |
Comparison with EPDM
| Property | CR | EPDM |
|---|---|---|
| Oil Resistance | Better | |
| Flame Resistance | Better | |
| Weather Resistance | Slightly Lower | |
| Water Resistance | Similar | |
| Cost | Higher |
CR is often selected when a balance of weather resistance and oil resistance is required.
Available Surface Finishes
Standard Finishes
- Smooth Finish
- Matte Finish
- Molded Finish
Functional Finishes
- Weather Resistant Finish
- Marine Grade Finish
- Flame Resistant Finish
Specialty Grades
- General Purpose CR
- Marine Grade CR
- Flame Retardant CR
- Closed-Cell CR
- Soft CR
Frequently Asked Questions (FAQ)
What is CR?
CR (Chloroprene Rubber) is a synthetic elastomer commonly known as Neoprene, offering excellent weather resistance, flame resistance, and balanced mechanical properties.
What is CR used for?
Typical applications include:
- Marine Equipment
- Automotive Seals
- HVAC Components
- Electrical Insulation
- Industrial Gaskets
Is CR weather resistant?
Yes. CR provides excellent resistance to UV exposure, ozone, and outdoor aging.
Is CR waterproof?
Yes. CR exhibits excellent water and moisture resistance, making it suitable for marine environments.
Is CR oil resistant?
CR offers moderate oil resistance, although NBR and FKM provide better performance for oil-intensive applications.
Why choose CR?
Because it combines:
- Excellent Weather Resistance
- Good Oil Resistance
- Flame Resistance
- Water Resistance
- Mechanical Durability
What is the difference between CR and Neoprene?
There is no practical difference. Neoprene is the commercial trade name, while CR is the technical material designation for Chloroprene Rubber.
Does GCNOV provide CR manufacturing services?
Yes. GCNOV provides:
- CR Compression Molding
- CR Injection Molding
- CR Extrusion
- Marine Component Manufacturing
- Industrial Gasket Production
- Prototype Development
- Low-Volume Production
- Mass Production