Metric Dimensions & Sealing Groove Compatibility
Metric EPDM O Rings are specified by inside diameter (ID) and cross-section (CS), with dimensions selected to match the sealing groove and mating components. Correct dimensional matching helps establish the required compression and maintain contact between the O Ring and sealing surfaces.
- Inside Diameter & Cross-Section - Select the O Ring dimensions according to the housing, shaft, or groove measurements. For replacement orders, measure the original ring carefully and check for dimensional changes caused by wear or deformation.
- Groove Dimensions & Compression - Groove width, depth, and clearance influence O Ring compression and available space for rubber deformation. Incorrect groove dimensions may lead to insufficient sealing contact or excessive compression.
- Static & Dynamic Installation - Static seals and moving seals have different design considerations. Dynamic applications require attention to friction, surface finish, clearance, and wear conditions.
- Dimensional Tolerance - Specify acceptable tolerances for ID and CS according to the design requirements and applicable standards. Chaoyue can review customer drawings or samples to confirm the required dimensions before production.
EPDM Material Properties & Fluid Compatibility
EPDM rubber is commonly selected for sealing applications involving water, weather exposure, ozone, and many water-based fluids. Its suitability depends on the specific compound, fluid composition, temperature, pressure, and duration of exposure.
- Water & Water-Based Media - EPDM compounds are commonly used in compatible water systems, including selected plumbing, water-handling, and heating applications. Additives and operating conditions should be checked before material approval.
- Weathering & Ozone Resistance - EPDM offers resistance to ozone, sunlight-related weathering, and outdoor environmental exposure, making it suitable for many outdoor sealing applications.
- Temperature & Steam Conditions - The applicable temperature range depends on the selected EPDM compound and service conditions. Hot water and steam applications require confirmation of the compound's specific suitability.
- Fluid Compatibility Limitations - EPDM is generally unsuitable for prolonged contact with mineral oils, petroleum-based fuels, and many hydrocarbon fluids. NBR or FKM may be evaluated as alternatives depending on the medium and operating requirements.
- Compound Selection - Before ordering, provide the conveyed fluid, operating temperature, pressure conditions, and expected service environment so the material can be assessed for the intended application.
Metric EPDM O Ring Customization
Non-Standard Metric Dimensions
Custom inside diameters and cross-sections can be specified to match existing grooves, replacement parts, or new equipment designs.
Hardness & Compound Requirements
Rubber hardness and EPDM compound selection can be discussed according to compression behavior, fluid exposure, and operating conditions.
Drawing & Sample-Based Development
Customers can provide CAD drawings, dimensional tables, or physical samples for specification review and sample evaluation before production.
FAQ
Can metric EPDM O Rings replace existing seals in imported equipment?
Yes, provided the replacement matches the original seal dimensions, groove design, material requirements, and operating conditions. Confirming the equipment model or original part number can help reduce selection errors.
Can I order several metric O Ring sizes in one purchase order?
Yes. Multiple sizes can be included in a purchase order, with each item identified by its part number, dimensions, material specification, and quantity. Separate labeling can help simplify receiving and inventory control.
Do metric EPDM O Rings need lubrication during installation?
Lubrication requirements depend on the equipment design, sealing medium, and installation method. If lubrication is permitted, use a lubricant compatible with both the EPDM compound and the system fluid. Avoid unapproved petroleum-based lubricants.
