EPDM Rings for Hot Water, Steam & Industrial Sealing Applications
Reliable Custom EPDM Rings from a China Manufacturer
Product Introduction
EPDM Rings, also known as EPDM O-rings, are widely used sealing components made from ethylene propylene diene rubber. They are especially suitable for applications involving hot water, steam, weather exposure, and glycol-based fluids.
At Xiamen Jinshun Sealing Technology Co., Ltd., we specialize in manufacturing custom EPDM rings for OEM customers across industries such as plumbing, HVAC, automotive, food processing, and pharmaceuticals. With stable material formulations, strict quality control, and flexible customization, our EPDM rings deliver long service life even under demanding conditions.
What Are EPDM Rings?
EPDM rings are elastomeric seals with excellent resistance to heat, ozone, UV, water, steam, and aging. Unlike many other rubber materials, EPDM remains stable in outdoor environments and hot water systems, making it a preferred choice for sanitary and long-term sealing applications.
EPDM rings are not suitable for mineral oil or petroleum-based fluids, but they perform exceptionally well in water-based and environmentally friendly systems.
Key Advantages of EPDM Rings
1. Excellent Hot Water & Steam Resistance
EPDM rings maintain elasticity and sealing performance in continuous temperatures up to 150°C, making them ideal for heating systems and steam lines.
2. Strong Weather, UV & Ozone Resistance
EPDM is naturally resistant to sunlight and ozone, allowing long outdoor service life without cracking or hardening.
3. Good Abrasion & Mechanical Strength
Suitable for both static and moderate dynamic sealing applications.
4. Broad Media Compatibility
Resistant to water, steam, glycol, brake fluids (DOT 3 / DOT 4), and many acids and alkalis.
5. Food & Drinking Water Compliance
FDA, WRAS, KTW, and other approved EPDM grades are available for hygienic applications.
EPDM Rings vs Other O-Ring Materials
| Material | Temperature Range | Media Resistance | Weather Resistance | Typical Use |
|---|---|---|---|---|
| NBR | -30°C to +120°C | Oils, fuels | Poor | Hydraulic oil |
| EPDM | -45°C to +150°C | Water, steam, glycol | Excellent | Hot water, HVAC |
| Silicone (VMQ) | -60°C to +200°C | Limited | Excellent | Medical, food |
| FKM (Viton®) | -25°C to +200°C | Oils, fuels | Good | Chemical, oil |
| FFKM | -40°C to +340°C | Almost all | Excellent | Extreme conditions |
Common Applications of EPDM Rings
1. Heating & Cooling Systems
EPDM rings are widely used in:
- Radiators
- Boilers
- Thermostats
- Cooling pipes
- Pumps
Their resistance to water and glycol-based coolants ensures stable sealing performance over long periods.
2. Food, Beverage & Pharmaceutical Equipment
EPDM rings are:
- Odorless
- Tasteless
- Free from harmful plasticizers
They withstand CIP/SIP cleaning, sterilization, and aggressive detergents, making them ideal for hygienic production lines.
3. Automotive & Eco-Friendly Fluids
EPDM rings are compatible with glycol-based brake fluids and biodegradable hydraulic fluids such as HEPG (DIN ISO 15380), supporting environmentally friendly system designs.
EPDM Rings – Technical Specifications
| Property | Value |
|---|---|
| Material | EPDM (Ethylene Propylene Diene Rubber) |
| Temperature Range | -45°C to +150°C (continuous) |
| Cross-Linking | Sulfur or Peroxide |
| Standard Hardness | 70 Shore A |
| Standard Color | Black |
| Manufacturing Process | Compression molding, Injection molding |
| Tolerance Standard | DIN ISO 3601 |
| Typical Service Life | Up to 8 years (proper conditions) |
Custom hardness (40–90 Shore A), colors, and compounds are available upon request.
Media Resistance of EPDM Rings
Resistant to:
- Hot water and steam
- Glycol-based fluids
- Brake fluids (DOT 3, DOT 4)
- Diluted acids and alkalis
- Ozone, UV, weathering
Not resistant to:
- Mineral oils
- Fuels
- Greases based on petroleum
Contact with oil causes swelling and loss of sealing performance.
Temperature Performance Explained
- Sulfur-cured EPDM: -45°C to +120°C
- Peroxide-cured EPDM: -45°C to +150°C
Special compounds can tolerate short-term exposure up to 180°C, but continuous operation above rated temperatures may cause permanent deformation.
At low temperatures, EPDM remains flexible down to approximately -50°C, making it suitable for cold environments.
Mechanical Properties of EPDM Rings
- High elasticity and recovery
- Excellent elongation at break
- Strong abrasion resistance
- Good resistance to compression set
These properties ensure easy installation and reliable sealing even after long-term compression.
EPDM Ring Groove Design Considerations
When designing grooves for EPDM rings:
- Follow DIN 3771 guidelines
- Static sealing compression: minimum 6%, typically 20–25%
- Dynamic sealing requires lower compression
- Allow up to 6% expansion under external pressure
- Consider 1–3% OD compression for internal pressure
EPDM has low thermal expansion, so groove design is relatively forgiving.
Installation Tips for EPDM Rings
- Use chamfers of 15–20°
- Remove sharp edges (radius ≥ 0.1–0.3 mm)
- Avoid twisting during installation
- Use silicone-based assembly lubricants only
- Never use mineral oil or grease for assembly
FAQs – EPDM Rings
Q1: What does EPDM mean?
EPDM stands for ethylene propylene diene rubber, a durable elastomer used for water, steam, and weather-resistant sealing.
Q2: Are EPDM rings suitable for drinking water?
Yes. FDA, WRAS, KTW-approved EPDM compounds are available.
Q3: Can you supply custom EPDM rings?
Yes. We support custom sizes, hardness, colors, and OEM drawings.
Q4: What does EPDM 70 mean?
It refers to the hardness level: 70 Shore A, the most common standard.
Why Choose Jinshun for Custom EPDM Rings?
- China-based custom EPDM ring manufacturer
- OEM & ODM support
- Stable material formulations
- International compliance options
- Fast sampling and flexible order quantities
Looking for a reliable supplier of custom EPDM rings for your application?
Our engineering team is ready to support your project with material selection, groove design advice, and fast quotations.
👉 Contact Xiamen Jinshun Sealing Technology Co., Ltd. today to request samples or a custom EPDM ring quote.
