Square Base Brush Seal
A small square base carrying a handful of rigid strands mixed with soft filament, rather than the full-width filament bed used on our other lines. Already running in production for a U.S. buyer.
Made to order Backing width, pile height, fin, colour — all specified by you. Standard sizes ship from stock; non-standard is the larger half of what we run.
Made to your channel, not ours
The two dimensions called out on that drawing are both yours to set. Strand mix, base size and whether you want pile directors are all variables here — tell us how many rigid strands versus soft filament, the base footprint, and how hard the opening is cycled.
No tooling charge
- Pile height
- Anything from 2.5 mm upward
- Fin or no fin
- Added or removed on any construction
- Silicone treatment
- On or off, on any construction
- Put-up
- Spool length and core to suit your line
Quoted once, credited back
- Colour
- Multiple standard; custom matched on request
- Non-standard backing width
- Tooling quoted once, credited against your production orders
- Non-standard backing profile
- Same terms. The tooling stays reserved to your part number
Send a drawing or send a physical piece — both are accepted, and the tooling we cut for you stays reserved to your part number. Large suppliers sell from a fixed catalogue and treat a non-standard size as an inconvenience. We were built the other way round.
Why this construction
Mixing a small number of rigid strands into an otherwise soft brush is a standard way to add stiffness and wear resistance without losing the soft filament's sealing contact — useful where the brush has to hold its shape against repeated mechanical contact. The specific end use for this construction is still being confirmed with the plant.
Where it is used
- Already in productionCurrently supplied to a U.S. buyer on this base.
- Square base, compact footprint3–3.2 mm × 3–3.5 mm — smaller than our standard flat backing.
- High-cycle openingsSpecify pile directors where the tuft is worked hard enough to lay over.
Sizes
Ranges below apply to this line. The full backing-width table, with the U.S. nominal each size sits against, is on the specifications section of the home page.
| Attribute | Range |
|---|---|
| Base size | 3.0 – 3.2 mm × 3.0 – 3.5 mm |
| Filament height | 9.5 – 25 mm (0.374″ – 0.984″) on current tooling |
| Construction | Rigid strands plus one soft filament |
| Pile-to-backing bond | Heat-fused, polypropylene to polypropylene — no adhesive in the bond |
| UV stabilisation | Available on request — dosed to the filament, base yarns and backing film |
| Colours | Multiple standard; custom on request |
| Dimensional tolerance | ±0.15 mm |
| Standard spool length | Made to your put-up — tell us the run length |
| Minimum order quantity | Scales with price — small runs welcome, quoted per volume |
| Sample lead time | 15 days on existing tooling; 30 days if a new backing profile has to be cut |
| Production lead time | 15 days ex-works on a first order, from receipt of deposit. U.S. contract volumes have run 30–45 days. Add 10 days if the filament colour has to be spun to order. |
How to specify it
Four things get you a quote and a matched sample. If you only have two of them, send two.
- The backing width you runGive it however you have it — .270″, 7 mm, or the die drawing. We convert.
- The pile height you needOr the gap you are sealing, if the height was never specified.
- Fin or no finAnd silicone treatment or not. These are the two that change the part number.
- Annual volume and colourRough is fine. It decides the run size, not the price of the sample.
Related lines
Spec sheet — Square base brush seal
This line’s own sheet: its section drawing, its published ranges, and the backing-width routing table. Fields still being confirmed with the plant are marked as such rather than filled in with a guess.