Country flag  Language

Global image  Global

Which seal has the lowest conductivity?

Which seal has the lowest conductivity?

Posted on 9/12/2016

There is a proverb that says: A chain is only as strong as its weakest link. This also applies to the fenestration industry. Doors and windows only perform as well as the seal.

The thermal performance that can be achieved by a window or door is determined by many different factors. The composition of the frame material and the glass are both very important. A low quality seal, however, can easily spoil the energy saving effects of insulated profiles and argon filled HR glass.

Under EN ISO 10456:2007, the design thermal conductivity of different materials used for seals is detailed thus:

  1. EPDM   0.25 W/(m·K)
  2. PVC     0.14 W/(m·K)
  3. PU       0.05 W/(m·K)

In accordance with EN12667 it now has been independently tested and certified by ift Rosenheim: Q-Lon has a measured low thermal conductivity of just 0.041 W/(m·K). This is better than any other weatherseal available in the market.

Compared to other seals, the loss of energy is reduced to the minimum. In combination with an excellent high compression recovery (on average higher than 90%) a high performance is also guaranteed over the long term. Q-Lon foam seals come with a 10-year warranty and are a preferred choice among experts.

For a copy of the full report please contact your local Sales Manager or Customer Service Agent. A full overview of our wide selection of standard available Q-Lon seals for aluminium, uPVC and timber sections can be obtained via our website. Use the product filter function to select the best suitable Q-Lon seal for your application.



   Back to news