Find the Perfect Material for Seals & Rubber-Plastic Composites
EPDM Rubber
Ethylene Propylene Diene Monomer (EPDM) is a synthetic rubber renowned for its exceptional durability, weather resistance, and sealing capabilities. With a unique molecular structure (C₃H₆-C₂H₄-C₄H₆), EPDM excels in demanding environments, making it the go-to choice for industrial, automotive, and construction seals.
Mechnical Properties
| Characteristic | Unit | Test Method | Specification | Result (A) | |||||
| 1 | Tensile strength | MPa | ISO 37 | 12 min | 15 | ||||
| 2 | Elongation | % | ISO 37 | 200 min | 280 | ||||
| 3 | Tear strength | N/mm | ISO 34-1 a | 4 min | 4.8 | ||||
| 3 | Compression set 24 hrs at 125℃ Method A-Type B | % | ISO815-1 | 15 max | 10 | ||||
| 4 | Ozone resistance (elongation 50%/ 40℃/100h/50 pphm O₃) | ISO 1431-1 | No crack | No crack | |||||
Key Properties of EPDM for Sealing
Temperature Resistance
Range: -50°C to +150°C (-58°F to +302°F)
Retains flexibility in extreme cold and resists degradation at high temperatures.
Weather & UV Resistance
Withstands ozone, sunlight, and oxidation without cracking.
Accelerated aging test (ASTM D573): <15% loss in tensile strength after 1,000 hours at 100°C.
Chemical Resistance
Resistant to polar fluids, acids, alkalis, and ketones.
Swelling rate: <10% in water, steam, and phosphate esters (per ASTM D471).
Mechanical Performance
Tensile Strength: 10–25 MPa (1,450–3,625 psi)
Elongation at Break: 300–600%
Hardness (Shore A): 40–90 (adjustable for soft or rigid seals).
Low Permeability
Gas permeability: 30% lower than nitrile rubber (NBR), ideal for air and vapor seals.
Why EPDM for Sealing Applications?
1. Automotive Seals
Applications: Cooling system, HVAC system, Braking system
Performance: Operates flawlessly in engine bays (-40°C to +125°C) and resists coolant/antifreeze.
2. Industrial Seals
Applications: Pipe gaskets, pump seals, HVAC systems.
Advantage: Withstands steam (up to 150°C) and aggressive cleaning chemicals.
3. Construction Seals
Applications: Window/door gaskets, roofing membranes.
Lifespan: 20+ years outdoors (tested per ISO 4892 for UV/weather resistance).
4. Water Systems
Applications:
Pipe gaskets, valve seals, pump diaphragms.
Water treatment equipment, filtration systems.
Performance Highlights:
Certifications: Our EPDM materials are FDA-certified, ensuring compliance with global drinking water safety regulations.
Chlorine Resistance: Withstands continuous exposure to chlorinated water (up to 5 ppm) without degradation.
FAQ
AFLAS® vs. FKM
AFLAS® (AGC Chemicals) is not an FKM but a TFE/P rubber (tetrafluoroethylene-propylene copolymer), classified under FEPM.
Key differences:
Superior alkali and steam resistance compared to FKM.
Lower fuel resistance but better electrical insulation properties.
Common applications: Geothermal seals, alkaline chemical processing.
What certifications do your materials comply with?
Our rubber compounds meet:
Specialized certifications: FDA-compliance for food-grade applications, USP Class VI for medical devices, and REACH/RoHS for environmental safety.
Custom certifications (e.g., UL, NSF) are available upon request.
Can you develop custom rubber formulations?
Yes! We specialize in tailored solutions for unique requirements:
Adjust hardness (Shore A 30–90), conductive, or flame resistance.
Optimize for extreme conditions (e.g., aerospace cryogenic seals, semiconductor acid baths).
Provide prototypes within 2–4 weeks.
Can you develop custom rubber formulations?
Yes! We specialize in tailored solutions for unique requirements:
Adjust hardness (Shore A 30–90), conductive, or flame resistance.
Optimize for extreme conditions (e.g., aerospace cryogenic seals, semiconductor acid baths).
Provide prototypes within 2–4 weeks.
Do you offer technical support?
Yes, we offer technical support from material selection to mechinical design and validation if needed.