Thermoseal Group is a UK-based manufacturer and distributor specialising in insulated glass (IG) components for the glazing industry. The company supplies more than 2,500 products used in the production of IG sealed units, including double, triple and quadruple glazing systems.

Its core in-house manufactured products include Thermobar and Thermoflex warm edge spacers, alongside bespoke injection moulded fittings. These products are used in IG unit fabrication and are designed for high thermal performance, with applications in demanding environments including passive building standards.

Thermoseal Group also produces a range of decorative and functional glass products, including DecraLed® self-adhesive lead strip, Decra Fused Tiles, Decra Bevels and Decraglow colour films used in glass decoration and finishing.

Founded in 1979, the business operates from multiple UK sites, including Birmingham, Wigan, Kent and Belfast. Manufacturing and distribution activities are supported by in-house logistics and export operations, supplying customers in more than 40 countries across Europe, Asia, Oceania, North and South America.

The company operates independently and reinvests in its growth, with active membership in industry bodies including the Glass and Glazing Federation and the Bundesverband Flachglas.

Its stated focus is on product development, supply reliability and long-term relationships within the insulated glass sector.