Introduction
Ethylene-Propylene Rubber (EPM, EPDM) material is a high-performance elastomer known for its exceptional aging resistance, ozone stability, electrical insulation, and compatibility with polar liquids. These properties make EPDM micro-molding ideal for seals, gaskets, and insulating components used in aerospace, medical, automotive, and electrical applications.
This article explores the benefits of Ethylene-Propylene micro-molding, key design considerations, and high-precision applications where it outperforms other elastomers.
Why Use Ethylene-Propylene (EPM, EPDM) for Micro-Molding?
Superior Weather & Ozone Resistance
- Outlasts Natural Rubber and SBR in UV, ozone, and outdoor exposure.
- Ideal for automotive weather seals, aerospace gaskets, and marine applications.
Excellent Aging & Heat Resistance
- Performs well in long-term sealing applications up to 150°C (302°F).
- Resists oxidation and thermal degradation, extending part lifespan.
Electrical Insulation Properties
- Dielectric strength makes EPDM ideal for high-voltage applications.
- Used in micro-molded electrical connectors, cable insulation, and high-precision gaskets.
Chemical & Polar Liquid Resistance
- Resistant to water, alcohols, glycols, and many acids.
- Suitable for medical fluid seals, fuel system components, and industrial chemical gaskets.
Design Guidelines for EPDM Micro-Molding
1. Optimize Wall Thickness & Uniformity
- Recommended thickness: 0.4mm – 1.5mm for micro-seals and electrical insulation parts.
- Maintain consistent thickness to avoid shrinkage or curing inconsistencies.
2. Maintain Tight Tolerances
- Standard tolerance: ±0.025mm for high-precision micro-components.
- Plan for slight shrinkage (~1-2%) when designing EPDM micro-molded seals.
3. Surface Finish Considerations
- Smooth finishes → Reduce moisture retention in electrical and medical applications.
- Textured surfaces → Improve grip and mechanical bonding in industrial seals.
4. Gate & Flow Optimization
- Small, evenly spaced gates prevent air entrapment and voids in thin-walled micro-molded EPDM parts.
- Proper venting is crucial for consistent part quality in electrical insulation applications.
Applications of EPDM Micro-Molding in High-Precision Components
- Aerospace & Defense – Ozone-resistant micro-seals, high-altitude gaskets, and thermal insulation.
- Medical Devices – Micro-molded EPDM seals for sterilization chambers and drug delivery systems.
- Automotive & Marine – Weatherproof micro-gaskets, coolant seals, and vibration-damping components.
- Industrial & Electrical – Dielectric insulators, high-voltage connectors, and moisture-resistant gaskets.
Ethylene-Propylene (EPM, EPDM) micro-molding is the best choice for high-precision seals, electrical insulators, and weather-resistant components. With its exceptional aging resistance, ozone stability, and dielectric properties, EPDM is trusted in aerospace, medical, automotive, and industrial applications.
In need of micro molded Ethylene-Propylene Parts?
For custom EPDM micro-molded components, consult rubber processing specialists to ensure optimal material selection and mold design for your application.
Contact us to learn more.
