QW-BB4 Bonding Bar – Composite Timber Window Glazing Bar

The QW-BB4 Bonding Bar is a high-performance composite glazing bar from the Qwood range by Quantum Profile Systems. Designed for timber window systems, it is used to create traditional multi-pane and Georgian-style glazing layouts while benefiting from the strength and stability of modern wood polymer composite (WPC) technology.

Manufactured for precision and durability, the QW-BB4 provides a consistent, straight and reliable alternative to traditional timber glazing bars, making it suitable for both heritage-style and contemporary timber window designs.

Designed for Bonded Glazing Bar Systems

The QW-BB4 is commonly used in bonded glazing applications, where glazing bars are fixed to the surface of the glass unit using specialist tapes or adhesives. This allows manufacturers to achieve the appearance of individual panes while using modern double-glazed units.

The system helps deliver a clean, traditional aesthetic while maintaining high thermal performance and modern manufacturing efficiency.

Key Features & Benefits
18mm x 13mm composite bonding bar profile
Manufactured from durable wood polymer composite (WPC)
Designed for bonded Georgian-style glazing systems
Consistently straight for accurate machining and fitting
No knots, splits, or natural timber defects
Resistant to warping, twisting, swelling, and rot
Smooth, paintable surface finish
Minimal expansion and contraction in service
Reduced sanding, preparation, and finishing time
Suitable for internal and external timber windows
Applications

The QW-BB4 Bonding Bar is suitable for a wide range of timber joinery applications, including:

Georgian-style timber windows
Heritage and conservation projects
Residential timber casement windows
Flush casement window systems
Commercial timber window manufacture
Factory-finished timber joinery

It is particularly effective where traditional glazing bar aesthetics are required alongside modern glazing performance.

Why Choose Qwood?

Qwood composite profiles are developed specifically for the timber window and door industry, combining traditional aesthetics with modern manufacturing efficiency.

Key benefits include:

No timber defects such as knots or splits
Consistent, straight profile quality
Reduced sanding and preparation time
Improved machining accuracy
Lower material waste in production
Long-term dimensional stability
Compatible with standard woodworking machinery
Suitable for modern paint systems and coatings

Qwood products are widely used by UK joinery manufacturers as a reliable alternative to traditional timber glazing bars.

Technical Information
Product code: QW-BB4
Product type: Bonding bar
Dimensions: 18mm x 13mm
Material: Wood polymer composite (WPC)
Finish: Smooth paintable surface
Application: Timber windows and doors
Manufacturer: Quantum Profile Systems

Technical drawings and full product range information are available via Qwood standard documentation. (

Samples & Technical Support

Free samples of the QW-BB4 Bonding Bar are available for joiners, manufacturers, and specifiers. Technical support is available for system compatibility, fabrication guidance, and installation advice.

About Qwood

Qwood is a specialist range of composite glazing beads, bars, and window profiles developed by Quantum Profile Systems for the timber joinery industry. The system is designed to replicate traditional timber detailing while improving durability, consistency, and manufacturing efficiency across modern window production.