35 years of service to the Double Glazing Industry

Technical Information

Composition and Manufacture

The window profiles are extruded from high impact PVCu which complies with BS7413:1991 under the strictest quality control.  In manufacture all mitred corners are fusion welded using the hot blade method for strength and weather tightness, transforms and mullions can be either V-notch welded or mechanically jointed.

Where necessary, profiles are reinforced with 1-5mm hot dipped galvanised steel or aluminium sections.  All window furniture is fixed through either two profile walls or into the reinforcement.

Weather Resistance

Samples of the windows have been tested by the British Standards Institute, Report Number BG001394.  Conformation to BS7412 weather performance requirements.


The notched impact strength in tension is 12 kj / m² and the ultimate tensile strength is 45 N/mm ² impact strength using the falling ball method show “no breaks”, and a figure of 20 kj/m² is obtained.

Wall Thickness

The external walls of all profiles are 3mm thick for maximum rigidity.  Internal walls are 1.5-2mm thick.


Internally glazed for attractiveness and security.


UPVc profiles are unaffected by chemicals found in normal building operations, sea water and other atmospheric pollutions.

Thermal Movement

The coefficient of linear expansion of Concept profiles is 0.7 x ºC.  Test method BS4618




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Imperial way, Watford, Hertfordshire WD24 4YY

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