H.B. Fuller Launches Kōfinity™ Portfolio to Advance Window Seal Reliability
H.B. Fuller, a global leader in adhesive solutions, has introduced Kōfinity™, a new product portfolio designed to advance insulating glass (IG) technology and improve the long-term reliability of window sealing systems. The new platform builds on the company’s established 4SG technology while creating a foundation for future innovations focused on durability, energy efficiency, and consistent performance.
The launch comes as manufacturers, architects, building owners, and homeowners continue to seek higher-performing window systems that can withstand demanding environmental conditions. Insulating glass units play an important role in improving building energy efficiency, but seal failure can significantly reduce their performance. Fogging, condensation, moisture infiltration, and declining thermal insulation are among the common problems associated with failed IG seals.
Kōfinity is intended to address these challenges by bringing H.B. Fuller’s proven 4SG reactive thermoplastic spacer technology into an expanded product platform. The company is positioning the technology under an elevated category of fusion bonded spacers, while also using the platform to introduce future IG solutions designed around changing market and manufacturing requirements.
According to H.B. Fuller, more than 100 million square meters of its 4SG technology have been used in installations around the world since its original introduction. The company reports that 99.9% of those installations remain operational, highlighting the technology’s field performance and durability.
“More than 100 million square meters of our 4SG technology have been used in installations worldwide since its original launch,” said Mark Conway, global vice president of H.B. Fuller’s Building Adhesive Solutions (BAS) global business unit. “It has a field-proven track record for exceptional reliability, with 99.9% of those installations still performing today.”
Fusion Bonded Spacer Technology
A central feature of the Kōfinity portfolio is its fusion bonded spacer technology. Unlike conventional window spacers that primarily depend on mechanical attachment or surface-level adhesion, fusion bonded spacers are designed to create a molecular bond with glass during the manufacturing process of an insulating glass unit.
The spacer is applied to the glass with robotic precision, allowing it to fuse directly to the glass surface. Where a secondary silicone seal is used, the technology can also bond with that sealant. This creates a continuous sealing barrier around the IG unit and is designed to minimize potential weak points within the window assembly.
The approach can provide manufacturers with a highly integrated sealing solution while supporting the thermal performance objectives of modern insulating glass systems. By creating a tight connection between the spacer, glass, and secondary seal, the technology is designed to reduce the risk of moisture-related issues and maintain the insulating properties of the IG unit over time.
Window seal reliability is particularly important as the construction industry continues to emphasize energy-efficient buildings. Windows can have a significant impact on the overall thermal performance of a building envelope. Poorly performing or damaged seals can contribute to heat transfer and condensation, potentially increasing energy requirements and affecting occupant comfort.
Supporting Energy-Efficient Buildings
The introduction of Kōfinity comes at a time when demand for high-performance building products is increasing across residential and commercial construction. Energy codes, sustainability objectives, and customer expectations are encouraging manufacturers to develop window systems that deliver stronger thermal performance without compromising durability.
For IG manufacturers, spacer technology is an important component of the overall window system. The spacer helps maintain the separation between glass panes while contributing to the edge seal and insulating performance of the unit. Advances in spacer design can therefore support manufacturers seeking to produce more efficient and durable windows.
H.B. Fuller says Kōfinity is designed not only to provide performance benefits but also to support manufacturing efficiency. The company’s focus on robotic application and fusion bonding is intended to provide manufacturers with a consistent production process while helping create reliable IG assemblies.
For architects and window dealers, improved seal reliability can contribute to longer-lasting window systems and reduced concerns related to condensation and fogging. For homeowners and building owners, reliable IG performance can help support long-term comfort and energy efficiency.
Platform for Future Innovation
Kōfinity is being introduced as a broader technology platform rather than a single product. H.B. Fuller plans to expand the portfolio with additional products as customer requirements and performance expectations evolve.
The company views continued product development as an important part of its strategy for the building adhesives market. By building on the experience gained through its 4SG technology, H.B. Fuller aims to develop new solutions that address manufacturing challenges while supporting the performance requirements of modern window systems.
“As demand continues to grow for high-performance, energy-efficient building products, the Kōfinity product line will provide manufacturers with operational efficiencies while offering architects, window dealers, and homeowners innovative solutions designed to deliver lasting durability, reliable thermal performance, and clear window satisfaction for decades to come,” Conway said.
The launch demonstrates the growing role of advanced adhesive and sealing technologies in the construction industry. As buildings become more energy efficient and performance requirements become increasingly demanding, manufacturers are looking for technologies that can combine durability, thermal efficiency, and reliable production processes.
With Kōfinity, H.B. Fuller is extending its established 4SG technology into a new platform focused on insulating glass applications. The company’s continued investment in fusion bonded spacers and related innovations is aimed at helping the window industry address seal reliability challenges while supporting the development of durable, energy-efficient building solutions.
As the Kōfinity portfolio expands, new products could provide IG manufacturers with additional options for improving production efficiency and meeting evolving requirements for window performance. The platform therefore represents another step in the development of advanced sealing technologies for the modern building envelope.
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