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What's glass made up of?

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What does K-value?

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What's the level of light transmittance?

It describes the percentage of sunlight, which is transmitted from outside to inside through a glass pane. A simple 4 mm glass sheet has a light transmittance of 85%. A heat-insulating glass pane (2X4 mm, 16 mm gap) with the proper K value of 1.1 lets pass at least 76% of the light.





Our windows carry the
CE-mark which indicates the conformity of the product
to the European guidelines.


For our PVC Windows and Doors we only use Materials "Made in Germany".


ISOGON has DIN EN ISO 9001 certified quality management system









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