EPDM O Rings are durable and versatile sealing solutions made from Ethylene-Propylene-Diene Monomer (EPDM). Known for excellent weatherability, ozone resistance, chemical resistance, and heat resistance, these O-Rings are widely used in automotive, industrial, and outdoor applications.
They provide reliable sealing in hot water and steam systems, resist polar solvents such as alcohols and ketones, and are highly suitable for weather-exposed equipment. EPDM O Rings are the first choice for applications requiring long-lasting performance under heat, UV, and chemical exposure.
Specifications & Selection Guide
| Shore A Hardness | Recommended Pressure | Typical Applications |
| 40–50 | Low | Low-pressure water sealing, weatherstripping |
| 60–70 | Medium | Automotive radiator seals, general industrial use |
| 80–90 | High | High-pressure steam, hydraulic systems (non-mineral oil) |
O-Ring Size & Cross-Section Diagram
ID: inner diameter
OD: outer dimeter
CS: cross section
Applications
Automotive: brake components, radiator seals, water pumps
Industrial machinery: pumps, valves, seals
Outdoor equipment: HVAC systems, weatherstripping
Water and steam sealing: pipelines, fittings
Chemical resistance: alcohols, ketones, acids, and alkalis
EPDM Material Limitations
Not suitable for direct contact with food or aromatic hydrocarbons
Avoid exposure to mineral oils or petroleum-based fluids
QZSEALS offers a full range of EPDM O Rings in all AS568 sizes, with most items readily in stock. We also provide custom solutions to meet your specific requirements. Contact us today to discuss your sealing needs and find the perfect O-Ring for your application.
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