Updated: September 30, 2026 · Topic: brush seal pile height selection
Quick Answer
Choose brush pile height from the largest operating gap, required contact and movement tolerance. The fibers should maintain light, continuous contact without excessive deflection or drag. For irregular gaps, allow enough pile to follow variation while keeping the backing properly supported. Confirm base width, pile density, fiber material, color and mounting method before ordering.
Key Selection Factors
| Factor | What to check | Why it matters |
|---|---|---|
| Gap | Measure minimum and maximum along the full travel | Sets the practical pile-height requirement |
| Contact | Light contact or controlled interference | Balances sealing and operating friction |
| Movement | Sliding, rotating or static interface | Influences fiber density and wear |
| Environment | Dust, draft, insects, light or debris | Guides pile material and density |
How to Convert Gap Measurements into a Trial Size
Record the smallest and largest installed gap across the complete travel path. Select a trial pile height that still contacts the mating surface at the largest gap, then check fiber deflection and operating force at the smallest gap. Because density, fiber stiffness, mounting angle and travel direction change the result, approve the final size on the real assembly rather than from gap dimensions alone.
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
- Choosing pile height from one measurement point
- Compressing fibers so heavily that sliding force rises
- Ignoring backing width and channel dimensions
- Using adhesive backing on a contaminated substrate
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 Solutions
Compare the grey wool pile brush seal and self-adhesive brush seal roll, or browse the full brush seal range. For a project review, send your gap, pile height and target quantity.
Manufacturer Sourcing Guide
Review custom pile height, density, base width, backing and roll packaging capabilities. Visit our brush seal manufacturer capability page.
Frequently Asked Questions
Should brush fibers bend during use?
A small controlled deflection can maintain contact, but severe bending increases drag and wear.
What information is needed for a quote?
Provide gap range, pile height, base width, roll length, color, mounting method and expected quantity.
Are brush seals suitable for waterproofing?
Brush seals are mainly used for dust, draft, light and debris control. Applications requiring water-tight sealing usually need a compatible rubber or foam seal.