Updated: August 5, 2026 · Topic: how to measure custom rubber seal profile
Quick Answer
For a custom rubber seal, provide a clean perpendicular cross-section with overall width and height, every wall thickness, channel or flange size, bulb diameter, lip length and critical tolerances. Add material, hardness, color, length, joining method, application photos and annual quantity. A physical sample is useful, but dimensions and the mating-part geometry are still needed for reliable tooling review.
Key Selection Factors
| Factor | What to check | Why it matters |
|---|---|---|
| Cross-section | Overall width/height, walls, lips, bulbs and channels | Defines extrusion geometry |
| Mating part | Flange thickness, channel width and contact surface | Confirms fit and compression |
| Material | EPDM, silicone, PVC, TPE/TPV or required performance | Guides compound selection |
| Commercial data | Cut length or coil, quantity, packing and target timing | Supports accurate quotation |
Recommended Buying Process
- Measure the application at several points and record minimum and maximum values.
- Share a section drawing, clear photos and details of the mating surface.
- Confirm material, color, mounting method, operating environment and order quantity.
- Test a sample on the real assembly before approving mass production.
Common Specification Mistakes
- Photographing the profile at an angle instead of square-on
- Measuring a compressed, stretched or damaged sample
- Leaving critical tolerances undefined
- Omitting the mating flange and working gap
What to Include in Your RFQ
Send the application, cross-section dimensions, mating-part dimensions, preferred material, color, length, quantity and packaging request. If the profile replaces an existing part, include an uncompressed sample and photos showing where it is installed. Onaseal can review drawings or samples for OEM/ODM production.
Related Onaseal Solution
See Custom Rubber Extrusion Service, or send your drawing and target quantity for a free sample and engineering review.
Frequently Asked Questions
Can you quote from a photo only?
A photo helps identify the profile, but a dimensioned cross-section or physical sample is normally needed for an accurate custom quote.
What file formats can I send?
Common PDF, JPG and CAD drawings are useful. Include units and mark critical dimensions clearly.
Do I need to specify rubber hardness?
If known, include it. If unknown, describe the application and send a sample so the engineering team can recommend a starting point.