Concealed sash window

The option “Concealed Sash” in the aluminium window System WICLINE evo features a special glazing bead fixed directly in the thermal break zone. As a result the system achieves an extremely slim frame elevation, superior thermal insulation values and a groove-free profile design from outside. The improved ratio between frame and glazing surfaces leads to very good Uw-values, increased light transmissions and panoramic views.

Technical performance

Profile technology:

  • High insulation multi-chamber system in symmetric design, quality assured thermal insulator connection
  • Patented corner and butt joint connection technology for high rigidity of frames and sashes
  • Infill thickness up to 42 mm
  • Optionally with integration frame for stick curtain walls

Thermal insulation:

  • Uf values: until 1.5 W/(m²K)
  • Uw values: until 0.94 W/(m²K) with triple glazing

Sealing concept:

  • Voluminous centre gasket with three installation methods
    - Circumferential centre gasket, avoiding joints in the corner areas
    - Formed corners, avoiding adhesive in the joints
    - Corner vulcanised frames


  • Heavy duty system fittings, with:
    - Visible hinges, powder coating or anodisation in all colors
    - Concealed hinges withintegrated end position damping, opening angle max. 105°
  • Sash weight:
    -  up to 130 kg
  • Sash sizes (w x h): 1400 mm x 2250 mm, fanlight 2500 mm x 1700 mm
  • Optionally with opening limiter in various executions

Additional designs in concealed sash design:

  • Integration frame for stick façades
  • Fanlight
  • Burglar resistance (see system tests)

System test results / CE product pass in accordance with DIN EN 14351-1:2006+A1:2010

Air permeability: Class 4
Watertightness: E1200
Resistance to wind load: Class C5 / B5
Operating forces: Class 1

Load bearing capacity
of safety devces:


Mechanical strength: Class 4
Repeated opening / closing: Class 2 (10,000 cycles)
Impact resistance: Class 3
Corrosion resistance of
the fittings:
Class 5
Burglar resistance: RC1N, RC2N, RC2, RC3
Quality assurance: Certified according to
ISO 9001:2008

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