Overview
EPDM (Ethylene Propylene Diene Monomer) is a high-performance synthetic rubber known for its exceptional weather resistance, ozone resistance, UV stability, water resistance, flexibility, and durability.
EPDM is one of the most widely used elastomers for outdoor and environmental applications because it maintains its mechanical properties under prolonged exposure to sunlight, moisture, ozone, and extreme weather conditions. It also provides excellent resistance to steam, hot water, and many industrial chemicals.
EPDM is widely used in:
- Automotive Sealing Systems
- Roofing Membranes
- HVAC Equipment
- Construction Applications
- Water Treatment Systems
- Electrical Insulation
- Industrial Gaskets
- Outdoor Equipment
Due to its outstanding environmental resistance and cost-effectiveness, EPDM is considered the industry standard elastomer for weather-exposed applications.
Material Specification
| Property | Value |
|---|---|
| Material Designation | EPDM |
| Full Name | Ethylene Propylene Diene Monomer |
| Material Family | Synthetic Rubber Elastomer |
| Density | 0.86–1.25 g/cm³ |
| Appearance | Black, White, Colored |
| Hardness Range | Shore A 30–90 |
| Typical Manufacturing Methods | Compression Molding, Injection Molding, Extrusion |
| Standard Forms | Sheets, Rolls, Tubes, Profiles, Molded Parts |
Chemical Composition
EPDM is composed of ethylene, propylene, and diene monomers.
| Component | Function |
|---|---|
| Ethylene | Mechanical Strength |
| Propylene | Flexibility |
| Diene Monomer | Crosslinking Capability |
| Carbon Black / Fillers | Reinforcement |
| Curing Agents | Vulcanization |
Its saturated polymer backbone contributes to excellent weather and ozone resistance.
Common EPDM Grades
| Grade | Characteristics |
|---|---|
| General Purpose EPDM | Standard Industrial Applications |
| Peroxide-Cured EPDM | Enhanced Heat Resistance |
| Sulfur-Cured EPDM | Cost-Effective General Use |
| Food Grade EPDM | FDA-Compliant Applications |
| Steam Resistant EPDM | High Temperature Water Systems |
Mechanical Properties
Typical Values
| Property | Value |
|---|---|
| Tensile Strength | 7–21 MPa |
| Elongation at Break | 200–600% |
| Tear Strength | 15–40 kN/m |
| Compression Set | Good |
| Hardness | Shore A 30–90 |
| Resilience | Good |
Typical Mechanical Performance
| Property | Performance |
|---|---|
| Flexibility | Excellent |
| Elastic Recovery | Excellent |
| Tear Resistance | Good |
| Fatigue Resistance | Good |
EPDM provides reliable elastomeric performance across a wide range of applications.
Physical Properties
| Property | Value |
|---|---|
| Density | 0.86–1.25 g/cm³ |
| Water Absorption | Very Low |
| Thermal Conductivity | 0.20–0.30 W/m·K |
| UV Resistance | Outstanding |
| Ozone Resistance | Outstanding |
EPDM is one of the most weather-resistant elastomers available.
Thermal Properties
| Property | Value |
|---|---|
| Continuous Service Temperature | -50°C to 150°C |
| Peroxide-Cured Grades | Up to 170°C |
| Short-Term Temperature Resistance | Up to 180°C |
| Brittleness Temperature | Below -55°C |
EPDM maintains flexibility in both hot and cold environments.
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| EPDM | 1.10 | 12 MPa |
| Silicone | 1.20 | 8 MPa |
| NBR | 1.20 | 15 MPa |
| Natural Rubber | 0.93 | 20 MPa |
EPDM offers an excellent balance of durability and cost efficiency.
Chemical Resistance
| Chemical Environment | Performance |
|---|---|
| Water | Outstanding |
| Steam | Excellent |
| Dilute Acids | Excellent |
| Dilute Alkalis | Excellent |
| Alcohols | Excellent |
| Brake Fluids | Excellent |
| Salt Solutions | Outstanding |
| Petroleum Oils | Poor |
| Fuels | Poor |
EPDM is ideal for water-based and weather-exposed environments but is not recommended for petroleum-based fluids.
Weather & UV Resistance
| Property | Performance |
|---|---|
| UV Resistance | Outstanding |
| Ozone Resistance | Outstanding |
| Outdoor Durability | Outstanding |
| Aging Resistance | Outstanding |
EPDM can withstand decades of outdoor exposure with minimal degradation.
Water & Steam Resistance
| Property | Performance |
|---|---|
| Water Resistance | Outstanding |
| Steam Resistance | Excellent |
| Moisture Stability | Outstanding |
| Hydrolysis Resistance | Outstanding |
EPDM is widely used in water handling and HVAC systems.
Electrical Properties
| Property | Value |
|---|---|
| Volume Resistivity | >10¹³ Ω·cm |
| Dielectric Strength | 15–25 kV/mm |
| Dielectric Constant | 2.5–3.5 |
| Arc Resistance | Good |
EPDM is commonly used as an electrical insulation material.
Compression Set Resistance
| Property | Performance |
|---|---|
| Seal Retention | Excellent |
| Elastic Recovery | Good |
| Long-Term Gasket Performance | Excellent |
| Compression Set Resistance | Good |
EPDM is frequently used for long-term sealing applications.
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| Compression Molding | Outstanding |
| Injection Molding | Excellent |
| Extrusion | Outstanding |
| Transfer Molding | Excellent |
| Overmolding | Good |
EPDM supports economical manufacturing for both low and high production volumes.
International Equivalent Standards
| Standard | Equivalent |
|---|---|
| ASTM D2000 | EPDM |
| ISO | EPDM |
| DIN | EPDM-Kautschuk |
| JIS | EPDM Rubber |
| GB/T (China) | 三元乙丙橡胶 |
| FDA | Food Grade Versions Available |
Available Forms
| Product Type | Availability |
|---|---|
| Sheets | Yes |
| Rolls | Yes |
| Tubes | Yes |
| Gaskets | Yes |
| Extruded Profiles | Yes |
| Molded Parts | Yes |
Typical Applications
Automotive Industry
- Door Seals
- Window Seals
- Weather Stripping
- Cooling System Components
Construction Industry
- Roofing Membranes
- Expansion Joints
- Building Seals
- Waterproofing Systems
HVAC Industry
- Air Duct Seals
- Gaskets
- Vibration Dampers
- Insulation Components
Water Treatment Industry
- Pipe Seals
- Pump Components
- Water System Gaskets
- Membrane Components
Electrical Industry
- Cable Insulation
- Outdoor Electrical Enclosures
- Connector Seals
Industrial Equipment
- Gaskets
- O-Rings
- Flexible Couplings
- Protective Covers
Advantages
Outstanding Weather Resistance
Exceptional durability under sunlight, ozone, and outdoor exposure.
Excellent Water Resistance
Ideal for water systems and outdoor sealing applications.
Wide Temperature Range
Maintains flexibility from -50°C to 150°C.
Excellent Chemical Resistance
Resists water, steam, acids, alkalis, and salt solutions.
Cost-Effective
Provides excellent performance at a relatively low material cost.
Long Service Life
Outstanding resistance to aging and environmental degradation.
Limitations
Poor Oil Resistance
Not suitable for petroleum oils or fuels.
Limited Hydrocarbon Resistance
Unsuitable for gasoline and many organic solvents.
Moderate Mechanical Strength
Lower tensile strength than some specialty elastomers.
Not Suitable for High-Vacuum Applications
Gas permeability may limit certain sealing applications.
Comparison with Common Elastomers
| Property | EPDM | Silicone | NBR | FKM (Viton) |
|---|---|---|---|---|
| Weather Resistance | Outstanding | Outstanding | Poor | Good |
| UV Resistance | Outstanding | Outstanding | Poor | Good |
| Water Resistance | Outstanding | Outstanding | Good | Good |
| Oil Resistance | Poor | Moderate | Excellent | Outstanding |
| Cost | Low | High | Low | Very High |
Comparison with Silicone
| Property | EPDM | Silicone |
|---|---|---|
| Cost | Lower | |
| Mechanical Strength | Higher | |
| Temperature Resistance | Lower | |
| UV Resistance | Similar | |
| Food & Medical Compatibility | Lower |
EPDM is often selected when cost efficiency and weather resistance are more important than extreme temperature performance.
Available Surface Finishes
Standard Finishes
- Matte Finish
- Smooth Finish
- Molded Finish
Functional Finishes
- Weather Resistant Finish
- UV Resistant Finish
- Water System Finish
Specialty Grades
- Peroxide-Cured EPDM
- Sulfur-Cured EPDM
- Food Grade EPDM
- Steam Resistant EPDM
- High Temperature EPDM
Frequently Asked Questions (FAQ)
What is EPDM?
EPDM is a synthetic rubber elastomer known for outstanding weather resistance, UV resistance, ozone resistance, and water resistance.
What is EPDM used for?
Typical applications include:
- Automotive Seals
- Roofing Systems
- HVAC Equipment
- Water Treatment Systems
- Industrial Gaskets
Is EPDM weather resistant?
Yes. EPDM offers some of the best weather, UV, and ozone resistance among elastomers.
Is EPDM suitable for water applications?
Yes. EPDM performs exceptionally well in water, steam, and outdoor environments.
Is EPDM resistant to oil?
No. EPDM is not recommended for petroleum oils, fuels, or hydrocarbon-based fluids.
Why choose EPDM?
Because it combines:
- Outstanding Weather Resistance
- Excellent Water Resistance
- Long Service Life
- Good Flexibility
- Cost Efficiency
What is the difference between EPDM and NBR?
EPDM excels in weather and water resistance, while NBR is preferred for oil and fuel resistance.
Does GCNOV provide EPDM manufacturing services?
Yes. GCNOV provides:
- EPDM Compression Molding
- EPDM Injection Molding
- Extrusion Services
- Automotive Sealing Components
- Industrial Gasket Manufacturing
- Prototype Development
- Low-Volume Production
- Mass Production