Brush strips are a flexible and effective solution for sealing gaps around doors, industrial gates, sliding systems, windows, frames and machinery. Their flexible filaments adapt to moving components and uneven surfaces, helping to limit the passage of draughts, dust, dirt, light and insects without completely restricting movement.
Because of this combination of flexibility and durability, brush strips are used in both new products and existing installations. They can be incorporated by manufacturers as a functional component or fitted by installers and service companies during maintenance, renovation or repair work.
A brush strip consists of closely positioned filaments held in a metal or plastic backing. Depending on the type, the strip can be mounted directly or fitted into an aluminium, steel or plastic profile.
The flexible filaments lightly touch the adjacent surface. This allows the brush to close a gap while the door, gate, panel or machine component can continue to move.
Brush strips are available in different:
The correct configuration depends on the application, the size of the gap and the conditions in which the brush strip will be used.
Brush strips can be found in many industrial, commercial and technical applications.
Common examples include:
In these applications, the brush strip can function as a seal, guide, protective barrier, separator or light cleaning component.
Industrial doors and gates often contain gaps between the moving door panel and the surrounding floor, wall or frame. These gaps may be necessary to allow the door to move, but they can also allow draughts, dust, dirt and light to enter.
A brush strip for an industrial gate can be mounted:
The filaments can compensate for small differences in floor level or frame alignment. This makes brush strips particularly useful when a rigid rubber or plastic seal cannot follow an uneven surface effectively.
Brush strips can be used on newly manufactured gates, but they are also suitable for replacing worn seals or improving an existing installation.
Sliding doors and sliding gates require sufficient clearance to move freely. At the same time, the open space around the moving component may create problems with dust, draughts, light or insects.
A brush strip for a sliding door provides a flexible barrier while maintaining the required freedom of movement.
It can be installed:
Because the filaments bend when the door moves, they generally create less resistance than a rigid sealing solution.
Sealing brush strips can help reduce the passage of:
A brush strip is not always intended to create a fully airtight or watertight seal. Its main advantage is that it closes or reduces an opening while remaining flexible. The required level of sealing depends on the filament density, filament height, mounting position and the pressure between the brush and the surface.
Floors, frames and metal structures are not always completely straight. A rigid seal may only make contact at certain points, leaving other parts of the gap open.
The flexible filaments of a brush strip can follow small irregularities in the surface. Different filaments can bend independently, allowing the strip to maintain contact over a larger part of the opening.
This is particularly useful for:
For manufacturers of doors, industrial gates, sliding systems, windows and technical constructions, a brush strip can become an integrated part of the final product.
Possible functions include:
The brush strip can be selected during the product-development phase and adapted to the profile, dimensions and expected movement of the construction.
For recurring production, it is important to consider not only the brush strip itself but also consistent quality, reliable availability and efficient installation.
Installers and service companies frequently encounter worn, damaged or missing seals during maintenance and repair work.
A replacement brush strip can offer a practical solution when:
Brush strips can often be cut to the required length and mounted on an existing door, gate or frame. This makes them suitable for both planned maintenance and one-off improvement projects.
Some applications can be solved with a standard brush strip, while others require a customised configuration.
Important selection criteria include:
The filament height must be sufficient to cover the opening. At the same time, the brush should not be compressed more than necessary, as excessive pressure may increase friction and wear.
The brush position depends on whether the component moves vertically, horizontally, rotates or passes through the brush.
A gate that opens a few times per day has different requirements from a machine component that moves continuously.
Temperature, humidity, chemicals, UV exposure and contamination can influence the choice of filament and profile material.
The available space determines whether the strip can be screwed, clamped, glued, slid into a profile or integrated into the construction.
A brush used to reduce draughts may require a different density and configuration from a brush used for guiding, cleaning or protecting a machine opening.
Brush strips mounted in aluminium profiles are widely used in doors, gates and technical constructions.
The aluminium holder provides:
Depending on the construction, the profile can be mounted horizontally, vertically or at an angle.
The correct filament height is determined by the gap that needs to be covered and the desired contact with the surface.
A brush that is too short may not close the opening. A brush that is too long may bend excessively, create unnecessary resistance or wear more quickly.
When selecting the height, it is important to measure the gap at several points. Floors and frames may vary, especially in existing buildings and older installations.
For larger differences, a longer or denser brush may be required. In some cases, the mounting profile can also be positioned so that the amount of contact can be adjusted.
Replacing an entire door or gate is not always necessary when the main problem is a gap or worn seal.
A suitable brush strip can help improve an existing installation by:
For service companies, this creates an additional maintenance solution that can be offered to customers during inspections and repair visits.
Nordhs supplies brush strips for doors, industrial gates, sliding systems, frames, machinery and other technical applications.
We can help assess:
A photograph, drawing or description of the application can help us understand the situation and select a suitable brush strip.
Contact KOTI-Nordhs to discuss your application, request a sample or find a suitable brush strip for your door, gate, sliding system or machine.
View our range of brush strips or contact our team for technical advice.