- Moisture & Water Resistance - EPDM exhibits good resistance to water and moisture in suitable applications, making it applicable to enclosure seals, outdoor equipment, and other assemblies exposed to damp conditions.
- Low-Temperature Flexibility - Depending on the compound formulation, EPDM profiles can retain flexibility at low temperatures, helping the sealing section accommodate dimensional changes and minor movement within the assembly.
- Heat & Aging Resistance - Properly formulated EPDM compounds can withstand sustained heat exposure within their specified operating range. Compound selection should account for temperature cycles and expected service duration to limit premature hardening or loss of elasticity.
- Compression Set Considerations - Compression set affects a seal's ability to recover after prolonged compression. The appropriate EPDM compound and profile geometry should be selected according to the required sealing load, compression level, and operating temperature.
- Fluid Compatibility - EPDM is generally suitable for water-based environments but is not normally recommended for prolonged contact with mineral oils, petroleum fuels, and many hydrocarbon fluids. Where chemical exposure is involved, compatibility should be confirmed for the specific compound and medium.
- Ozone & Weathering Resistance - EPDM has good resistance to ozone-induced surface cracking and atmospheric exposure. This property supports outdoor sealing applications where profiles are repeatedly exposed to sunlight, wind, and changing weather conditions.
Extrusion Process & Vulcanization Control
Die Design & Profile Formation
The extrusion die is designed around the required cross-section, including profile width, height, wall thickness, and hollow cavities where applicable. Die geometry and material flow are coordinated to achieve the specified profile shape.
Extrusion Parameter Control
Feed rate, extrusion speed, and processing conditions are managed to support continuous material flow and consistent cross-sectional dimensions. Appropriate parameter control helps reduce surface irregularities and dimensional variation along the profile.
Vulcanization & Cooling Control
Curing temperature and residence time are matched to the EPDM compound and profile geometry to develop the required elastic properties. Controlled cooling and handling help limit distortion before cutting, winding, or further processing.
Finished Profile Inspection
Finished extrusions are checked against specified dimensions, including cross-sectional width, height, and wall thickness where applicable. Surface condition, cut length, and other critical characteristics can also be inspected according to the approved product specification.
FAQ
Can EPDM rubber extrusions be supplied in continuous rolls?
Yes. Suitable EPDM extrusion profiles can be supplied in continuous coils or straight lengths, depending on the cross-sectional dimensions, profile stiffness, and packaging requirements. The supply format should be confirmed before ordering to ensure it suits the buyer's handling and assembly process.
Can EPDM extrusion profiles be joined to form a closed sealing frame?
Yes. Certain EPDM profiles can be cut to length and joined at their ends to form closed-loop seals. The joining method depends on the profile geometry and application requirements. Corner alignment and joint integrity should be checked before the seal is installed.
Can EPDM rubber extrusions be cut to specific lengths?
Yes. Profiles can be supplied in specified cut lengths according to the product design and production arrangements. Buyers should provide the required finished length and length tolerance, particularly when the profiles must fit a predefined assembly perimeter.
