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Who We Are

Who We Are

Who We Are

Who We Are

Who We Are

We are Dedicated to Insulated Glass (IG) 

Our business is the largest specialist IG component manufacturer and distributor in the UK supplying over 2,500 components and a wide range of Thermoseal Group Equipment (TGE) for manufacturing IG sealed units (IG sealed units are sometimes referred to as ‘Dual Pane Glass’ – double glazing, triple glazing or quadruple glazing). 

The core products we manufacture in-house are Thermobar and Thermoflex Warm Edge Spacers including bespoke injection moulded fittings. These are two of the highest performance warm edge spacers currently available in the world - achieving a Passive House phA+ component rating for Arctic Climates and are highest rated for hygiene.  

Our products are exported worldwide, so whether you're an IG sealed unit manufacturer, a window fabricator or a double glazing installer in any location, we are the one-stop-shop for all levels of IG sealed unit manufacture.  

We also manufacture the DecraLed® self-adhesive lead strip, Decra Fused Tiles, Decra Bevels and Decraglow colour films for application and decoration of glass in single and double glazing.  Our British products are the highest performance, preferred by manufacturers and highly competitive in the worldwide market.

Originally founded in 1979, the business has seen substantial growth over the years and operates from 4 rapidly-expanding sites in Birmingham, Wigan, Kent and Belfast. Thermoseal Group is entirely privately-funded and growth is through re-invested profit.  We have our own distribution network of warehouses, vehicles and drivers to deliver components in the UK and our expanding export operations are carried out directly from our main manufacturing site in Wigan. We now deliver to 40 countries within Asia; Oceania; Europe; North America and South America. 

We are also active members of the Glass and Glazing Federation (GGF) and the Bundesverband Flachglas (BF) working for the IG industry.  

Our Vision

To be an international manufacturer of IG products, with recognised brands that can be seen in buildings around the world.

Our Mission

To supply reliable, high-quality products and provide excellent quality of service, achieved through product innovation, staff development and establishing lasting relationships with customers and suppliers.





NFA Awards 23 International Fast Track 200 Amazon Growing Business Award NFA Awards EEF Future Manufacturing Award – North West NFA Awards 22

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Thermoseal Group

Our business is dedicated to the manufacture and supply of highest performance components and machinery used in the manufacture of insulated glass. Our particular focus Is on the development of components designed to help meet the changing requirements for more thermally efficient windows. We are a multiple award-winning organisation with almost 40 years in the industry.

Latest News

Thermoseal Group nominated as G23 'Component Supplier of the Year' Finalist
Date Added 03/10/23

Thermoseal Group is a finalist in the Component Supplier of the Year category in the G23 Awards, in recognition of its investment in infrastructure,... > More


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