3.5–4.5 mm Base Width Insert Type Brush Seal for Doors & Windows
The 3.5–4.5 mm Base Width Insert Type Brush Seal is a flexible brush weatherstrip designed for sliding doors, windows, aluminum profiles and uPVC systems requiring reliable gap sealing.
Available in 3.5 mm, 4 mm and 4.5 mm base widths, this insert brush seal is designed to fit narrow groove channels where a compact brush seal solution is required. The flexible brush fibers provide continuous contact with the opposite surface while allowing smooth opening and closing movement.
Unlike self-adhesive brush seals, insert type brush seals are installed directly into a dedicated groove or channel, providing a secure and clean installation method for door and window profiles.
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Key Features
- 3.5–4.5 mm narrow base width options for compact groove applications
- Insert installation without adhesive backing
- Flexible brush fibers for smooth sliding movement
- Helps reduce dust, drafts, light and gap penetration
- Suitable for aluminum and uPVC door and window profiles
- Available in multiple overall heights
- Standard and siliconized (water-repellent) options available
- Supplied in retail cut lengths and bulk rolls
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Specifications
| Item | Specification |
|---|
| Product Type | Insert Type Brush Seal |
| Base Width Options | 3.5 mm / 4 mm / 4.5 mm |
| Overall Height | According to specification |
| Size Definition | W × H |
| W | Base Width |
| H | Overall Height, including base |
| Brush Material | Nylon / PP (depending on specification) |
| Treatment Options | Standard / Siliconized (Water-Repellent) |
| Color Options | Black / Gray |
| Installation | Insert into groove or channel |
| Application | Sliding Doors, Windows, Aluminum & uPVC Profiles |
Size Definition
Size (W × H):
- W = carrier width
- H = overall height, including the base.
Example:
4 × 10 mm
means:
- 4 mm = Base Width
- 10 mm = Overall Height (including the base)
Please confirm the existing groove size before selecting a replacement brush seal.
Available Sizes & Roll Options
Available sizes, colors, treatments and roll lengths vary depending on specification. Please refer to the tables below for current available combinations.
Standard Brush Seal – Available Options
| Size (W × H) | Color | Treatment | Length |
|---|
| 4 × 4 mm | Gray | Standard | 10 m Cut Length |
| 4 × 5 mm | Gray | Standard | 10 m Cut Length |
| 4 × 6 mm | Gray | Standard | 10 m Cut Length |
| 4 × 10 mm | Gray | Standard | 10 m Cut Length |
| 4 × 14 mm | Black | Standard | 100 m Full Roll |
| 4.5 × 5 mm | Black | Standard | 100 m Full Roll |
Standard Brush Seal
Standard Brush Seal is a general-purpose brush weatherstrip suitable for common door and window sealing applications.
It provides flexible contact between surfaces and helps reduce the passage of dust, drafts and light through gaps.
Typical advantages:
- Cost-effective sealing solution
- Suitable for general replacement applications
- Flexible brush fibers for smooth operation
- Available for retail orders and maintenance projects
Siliconized (Water-Repellent) Brush Seal – Bulk Roll Options
| Size (W × H) | Color | Treatment | Roll Length |
|---|
| 3.5 × 4 mm | Black | Siliconized (Water-Repellent) | 250 m Full Roll |
| 3.5 × 5 mm | Black | Siliconized (Water-Repellent) | 250 m Full Roll |
| 3.5 × 6 mm | Black | Siliconized (Water-Repellent) | 250 m Full Roll |
| 3.5 × 8 mm | Black | Siliconized (Water-Repellent) | 500 m Full Roll |
| 3.5 × 10 mm | Black | Siliconized (Water-Repellent) | 300 m Full Roll |
| 4 × 2 mm | Black | Siliconized (Water-Repellent) | 400 m Full Roll |
| 4 × 3 mm | Black | Siliconized (Water-Repellent) | 500 m Full Roll |
| 4 × 4 mm | Black | Siliconized (Water-Repellent) | 250 m Full Roll |
| 4 × 5 mm | Black | Siliconized (Water-Repellent) | 250 m Full Roll |
| 4 × 6 mm | Black | Siliconized (Water-Repellent) | 500 m Full Roll |
| 4 × 8 mm | Black | Siliconized (Water-Repellent) | 300 m Full Roll |
| 4 × 9.2 mm | Black | Siliconized (Water-Repellent) | 10 m Cut Length |
| 4 × 10 mm | Black | Siliconized (Water-Repellent) | 300 m Full Roll |
| 4 × 12 mm | Black | Siliconized (Water-Repellent) | 300 m Full Roll |
Siliconized (Water-Repellent) Brush Seal
Siliconized Brush Seal features brush fibers treated with a silicone-based finish to improve surface smoothness and water repellency.
Compared with standard brush seals, the treated fibers provide smoother sliding performance and reduced friction, making them suitable for applications where frequent movement and improved weather performance are required.
Typical advantages:
- Smoother fiber surface
- Reduced friction during sliding operation
- Water-repellent brush fibers
- Suitable for high-use doors and window systems
- Supplied mainly in bulk rolls for manufacturers and distributors
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Applications
Insert brush seals are widely used in aluminum profiles where a dedicated groove is available.
- Sliding Doors and Windows
The flexible brush structure provides sealing contact while allowing smooth opening and closing movement.
- uPVC Door and Window Systems
Suitable for weather sealing, dust protection and gap closure applications.
Can be used where a flexible brush barrier is required.
Installation
- Remove the existing brush seal from the groove.
- Clean the installation channel.
- Confirm groove width and depth.
- Insert the new brush seal into the channel.
- Check that the brush contacts the opposite surface evenly.
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How to Select the Right Insert Brush Seal
Before ordering, check:
1. Base Width
Measure the existing groove width to confirm the correct insert size.
2. Overall Height
Measure the complete seal height, including the base.
3. Sealing Gap
Select a height that provides contact without excessive compression.
4. Treatment Requirement
Choose according to application:
- Standard — general sealing applications
- Siliconized (Water-Repellent) — smoother operation and improved moisture resistance
FAQ
What does 3.5-4.5 mm mean in this brush seal?
The specification refers to the base width, not the brush height.
Does overall height include the base?
Yes. Overall Height refers to the total height including the base/carrier.
What is the difference between Standard and Siliconized Brush Seal?
Standard brush seals are suitable for general applications. Siliconized brush seals use treated fibers to provide smoother sliding performance and water-repellent properties.
Can this brush seal be used for sliding doors?
Yes. Insert type brush seals are commonly used for sliding doors, windows and profile systems.
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