High Performance Casement

Simple, Streamlined Aesthetics


The Dualframe 75 Si Casement window uses advanced polyamide thermal break technology to provide thermal performance without the need to resort to complex and costly sealed unit specification. 

These excellent performance characteristics make the Dualframe 75 Si casement the ideal solution for today's residential projects.

The specialised profile range adds great flexibility when constructing windows where inward and outward-facing rebates have to be combined, without the need and expense of coupling sections or dummy frame to fixed lights. Universal frames can be used to create the most complex of screens easily combining casement, tilt before turn, and reversible opening lights, as well as inside and outside glazing. Combined with the option of having different finishes inside and out, the Si suite will give you endless choices.

For more information, see our brochure under the Documentation tab, or contact us.

Dualframe 75 Si Brochure (pdf)

Product benefits


  • Fixed Lights - 5m²
  • Glazing Thickness to 50mm
  • Vent Weight to 100kg


  • PAS 24 and Secured by Design compliant
  • Available as top-hung, side-hung or fixed lights
  • 88mm sightline maximises viewing area and increases incoming light


  • Dual colour finish available allowing flexibility in internal and external design
  • Universal frames can be used with other Dualframe 75 Si products to create screen combinations
  • Window automatically defaults to Tilt mode when closed


  • Air Permeability - 600Pa
  • Water Tightness - 600Pa
  • Wind Resistance - 2000Pa

More information

Technical manual


Projects using windows DUALFRAME 75 SI

Verde, Newcastle

United Kingdom
A total of 770 windows feature on the Newcastle’s student accommodation, Verde. This is the fourth and final phase of the £250 million Downing Plaza development - the largest planning application to be granted in Newcastle for a generation. Located on the former Hill Court Site, designed by award-winning architects SimpsonHaugh, this striking landmark set a new standard for student living in Newcastle.

Santara, Jersey

The project team responsible for a striking residential property in the Channel Islands have used Technal’s Dualframe 75 windows and the Elegance 52 curtain wall system, supplied by Pallot Glass & Windows, to match the property’s modernist styling, as well as to provide outstanding weather performance in a very exposed situation.