Solarlux Highline Bi-folding Door in a restaurant

Highline Bi-Folding Door

The Solarlux Highline bi-folding door boasts a sightline of just 99mm in the panel joint and panel height of up to 3.5 meters!

Incredibly Slim Sight Lines, Patented Technology

The aluminium Solarlux Highline bi-folding door expands on the extensive capabilities of the Ecoline door with increased panel widths of up to 1,100mm and heights of up to 3,500mm. Featuring a depth of 84mm, the Highline can be specified with double or triple glazing. Like the Ecoline, the Highline features unbroken, slim sight line of 99 mm at the panel joint even when using large and heavy panels.

Technology at a glance

Burglar Resistance




Air Permeability


Water Tightness

Up to 9A

Thermal Transmission Coefficient

Uw > 0.8 W/m²K

Sound Reduction Index

R’w up to 45 dB

System Description

Highline Bi-folding Door Profile System

  • Modular aluminium profile system with high-performance thermal insulation and choice of two building depths: 67 mm for Ecoline or 84 mm for Highline
  • Bottom-running; minimal load support required in case of falls
  • Edged profiling
  • Minimum sight line of 99 mm in the panel profile joint
  • Single-piece, multi-functional, fibreglass-reinforced polyamide bionicTURTLE® break profile
  • Loose shear bond built into thermal break to compensate for thermal loads
  • Mitred panels connected by corner pieces that are glued and pressed together on the inside to create a sturdy joint
  • Controlled drainage
  • Built-in running tracks and guide rails
  • Separate levels for runners and locks
  • Floor track (accessible and suitable for living spaces) available
  • Built-in, concealed cable routing

Sealing System

  • The seal encompasses two all-round sealing levels with constant gap sizes and even seal pressure between the panels
  • Sealing levels not interrupted by fittings
  • Sheathed foam seals with optimum sliding properties
  • With optional convection chamber interruption seals for improved thermal transmittance
  • Up to three sealing levels available

Design Variants

  • Panels fold either inwards or outwards, to either left or right
  • Left and right sliding panel pairs also available
  • Floor track designs without rebates in compliance with German standard DIN 18040 on “Accessible construction”
  • Floor tracks available as minimal floor tracks without height offset
  • RC2/RC2N version available as an option
  • Tilting or turn-and-tilt panel can be built into the frame-side
  • panel of a panel pair with concealed fittings
  • Modular system allows folding, tilting, turn-and-tilt and fixed elements to be combined in a single frame with an uninterrupted floor track thanks to integral profile
  • Bi-folding door available on balustrade or with top light in a frame


  • No protruding running tracks or guide rails
  • Fittings with one-hand operation in profiles
  • With optional built-in TwinX concealed panel centring mechanism for high wind loads
  • System hinges also suitable for heavy panel weights
  • System adjustment mechanism built into sub-frame rebate, outside the sealing level
  • The specially shaped stainless-steel running track with tapered track roller allows the use of unguided carriages
  • Stainless steel ball bearing runner mechanism: stainless steel track rollers and stainless steel bearing surfaces for quiet running and very long service life
  • Easy-running, low-wear carriage fitted with double-row deep-groove ball bearings and built-in anti-prying guard
  • Sliding lock or optional lock-in-place panel for controlled ventilation
  • High-quality, stainless-steel Solarlux designer handles
  • Lock-in-place, one-hand operation thanks to special gears with stroke of 24 mm
  • Passdoor available with latch-key-activated, multi-point lock and profile cylinder
  • Secure hinge pins
  • Secure cleaning pin with convenient unlocking mechanism and misuse prevention system to allow cleaning of the outsides of the panels on inwards-opening bi-folding door elements
  • Thanks to its defined locking points, this cleaning pin can be used for both paired and unpaired bi-folding doors
  • Lock monitoring system with reed contacts and concealed cable routing
  • Patented “Comfort Snap” panel catch
  • Optional load-transferring plates with centring grooves and sealing cushions for mounting the sub-frame profiles and floor track
  • Additional mounting screw covers in frame rebate


  • Sustainable manufacturing
  • Certified disposal in accordance with DIN EN ISO 14001:2009


  • In-house production control
  • Tested in accordance with DIN EN 1090, design class EXC 1 & EXC 2
  • Certified in accordance with DIN ISO 9001

Find out more about the Highline bi-folding door on the Solarlux website here.

Solarlux World Of Colours

Solarlux products are available in any RAL colour. The stand colour palette includes around 30 RAL colours in both matt and gloss finishes at no extra cost.

RAL 1015

RAL 3011

RAL 5003

RAL 5008

RAL 5014

RAL 6005

RAL 6009

RAL 7004

RAL 7006

RAL 7015

RAL 7016

RAL 7021

RAL 7024

RAL 7035

RAL 7038

RAL 7039

RAL 7040

RAL 8017

RAL 8019

RAL 8022

RAL 8077

RAL 9001

RAL 9003

RAL 9004

RAL 9005

RAL 9006

RAL 9007

RAL 9010

RAL 9011

RAL 9016

What Our Clients Say

See All Testimonials

Sue, Winchester

Great communication, kept up to date with with all aspects of our order, which was for a picture window and patio door. We had Rationel triple glazed windows installed and are really pleased with the performance of the windows. The installation team were fabulous, very professional and friendly.

Andrew, Pagham

We were recommended to use Rationel windows and Solarlux bifolds by an architect friend and Composite Windows are the local supplier. Very good service, great windows – well worth the money.

Jenny & Heilco, Brockley

Thank you to you and your team for completing this job. The windows are great and you did a fantastic job getting them in on one day! We would be happy to recommend you to others.

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