Window Profile Systems

Plastic windows are used in almost all regions of the world, ranging from Scandinavia to Australia via China to North and South America. The plastic frame profiles used must be able to permanently withstand wind, rain, solar radiation and the mechanical stress from the operation.

In order to ensure that the characteristics of the plastic window profiles are properly adjusted to this range of requirements, it is necessary to revise the properties within the scope of suitability tests and to monitor the properties achieved during series production regularly. Currently, we monitor approx. 60 production plants worldwide.

Window Profiles

The frame material of nearly 60 % of all window elements consists of the plastic PVC-U.

This area comprises:

  • Plastic window profile systems made of PVC-U for windows and front doors
  • Laminated plastic window profiles
  • Colour-coated plastic window profiles
  • Coextruded plastic window profiles with acrylate coatings
  • Fibre reinforced plastic window profiles


Within the scope of suitability and inspection tests, the following range is covered:

  • Material specific properties on formulations and profiles
  • Weathering resistance (ageing behaviour) of formulations, profiles and laminate films 
  • Profile properties which are decisive for the fabrication of the profiles to finished windows


The decisive standards and guidelines for the tests are:

  • RAL-GZ 716
  • EN 12608
  • NEN 7034-1 and –2
  • EN 513
  • NF 126

Sealing Profiles for Windows and Doors

The serviceability of windows depends considerably on the characteristics of the sealing profiles.

In addition to the testing and external monitoring of sealing profiles, also the sealing materials used are tested (EPDM TPE PVC-P).

These tests are conducted on the sealings or extruded flat belts and include, apart from tests for determining the mechanical characteristics (e.g. compression set), also tests of the resistance to artificial weathering.

The decisive standards and guidelines for testing are:

RAL-GZ 716/1, section II

EN 12365-I, -II, -III, IV

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