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Manufacturing High Quality Components for Longevity

Test Centre Equipped for EN1279 testing

Components Engineered with over 40 years in IG

Our Technical Centre and EN1279 test laboratory is operated by qualified Chemists using the latest technology to study insulated glass (IG) components at a molecular level.

We are dedicated to IG and focus completely on ensuring that all of our products are designed for longevity in windows and comprehensively tried and tested for ease of use in manufacturing IG units. This section of our website is where you’ll find technical news, data sheets, answers to frequently asked questions and links to technical information across our website.  If you can’t find what you are looking for, please don’t hesitate to e-mail


Q. How do I recycle my used Thermoflex and DecraLed packaging?

We will gladly accept your used boxes, reels, and where applicable, the plastic bag the reel comes in (excluding the foil insert which will need to be disposed of in the usual way). 

We can recycle all packaging as below:

  • Thermoflex Standard Reel with Box and Plastic Bag
  • Thermoflex Auto Reel with Box and Plastic Bag 
  • DecraLed Boxes and Empty Reel

Click here to view our video guide or follow our instructions below.

UK customers can easily arrange collection by contacting their local branch who will ensure that our delivery driver picks them up when next delivering to the customer's site. 


Q. Do you have any tips for making sealed units to meet EN1279 part 3 standards?

  • Limit the number of paths for escape of gas where possible and ensure that corners, joints and staple holes are secured to limit gas loss. It is unlikely that you will be able to meet the requirements of part 3 without using a dual seal system - i.e. PIB as an inner sealant.  If you don't have a PIB machine, ask us about purchasing your spacer bar with pre-applied PIB.
  • Try using hand-applied PIB as a primary seal to bond your unit together.
  • Once your unit is filled with gas, plug and fill gas holes as soon as possible to limit the gas loss during manufacture.
  • To achieve the best sealant bond ensure that the sealant is at its optimum temperature for application and that the glass is warm and dry.

Q. What is the shelf life of Thermoflex Warm Edge Spacer?

The shelf life of Thermoflex Warm Edge Spacer is 12 months from the date of manufacture and this is printed on the individual label attached to each box.  This is a similar shelf life to other pre-desiccated flexible spacer systems and may still be fully active beyond this period.  

To ensure that the product is fully active, you can check this using an activity test kit, which is  available to purchase from Thermoseal Group.  See: Thermoflex Desiccant Test KitsReplacement Humidity Indicator Cards are also available.

We recommend that once opened, Thermoflex should be resealed in the original foil bag, expelling as much air as possible to ensure the maximum usable life.

Data Sheets


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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 Sold to Fenzi in Landmark Deal
Date Added 03/07/24

Thermoseal Group has been acquired by Fenzi Group Spa (Fenzi), a Milan-based chemical company specialising in glass processing solutions, in a deal... > More


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