Winflex Optima Vario Membrane

£46.50£91.60 inc. vat (RRP)

Winflex® Optima Vario is a special FULL ADHESIVE membrane for fast and reliable sealing of abutment joints on windows and exterior doors in accordance with the recommendations of the RAL Quality Assurance Association installation guidelines for windows and front doors and DIN 4108-7. Winflex Optima Vario has a special structure allowing it to stretch in the transverse direction for optimal absorption of structural movement. This directional flexibility guarantees durable sealing of abutment joints.

Winflex® Optima Vario allows the abutment joint to dry out from the inside or outside. Depending on weather conditions, since the Winflex® Optima Vario water vapour diffusion characteristics allow it to adapt to the physical properties of the building structure, thus assisting optimal drying of the abutment joints. The same Winflex Optima Vario tape is usable for internal and external sealing, in both cases blocking moisture from penetrating the joint. The underside of the self-adhesive tape is full-surface coated with the BOSIG High Tack adhesive, which is an extremely aggressive adhesive. This allows application even at low temperatures. The split cover foil on this self-adhesive layer allows particularly easy and time saving application. Winflex Optima Vario may be plastered and painted over and is fully concealed after installation.

Winflex Optima Vario offers you the following advantages:

  1. A single tape for internal and external abutment joint sealing no danger of confusion, reliable planning, reducing stocks by half.
  2. Numerous variants for any installation situation.
  3. Optimal drying of the abutment joint.
  4. Absorbs structural movements thanks to transverse stretch-ability / flexibility.
  5. Durable sealing ensured.
  6. You can paint and/or plaster it over.
  7. No fluid adhesive systems to soil the window surfaces.
  8. Solvent-free.
  9. Good compatibility with acrylic glass and polycarbonate.
  10. Strong adhesion of the adhesive strip to all types of window frames.
  11. Full-surface self-adhesive tape underside with application-friendly, split cover foil, equipped with the BOSIG High Tack adhesive.
  12. Perfect handling and optimal workability due to soft and pliable consistency to match all structural conditions.
  13. No additional adhesives required for application.
  14. Rendering application particularly easy and time-saving.
  15. Especially suited for wooden frame construction.

Technical Details

Colour Beige  
Base high-grade polymer membrane, coated on both sides with fibrous web  
Temperature resistance – 40C to + 80C  
Processing temperature + 5C to + 35C, possible from –10C  
UV resistance 3 months max.  
sd value 0.1 to 6.6 m, depending on humidity based on
DIN EN ISO 12572
Fire behaviour Fire Classification E, normally inflammable DIN EN 13501–1
Width 70, 100, 150 mm. Bigger widths available  
Length of roll 40 m  
Max. tensile force lengthwise
& across
approx.600 N / 50 mm
approx. 100 / 50 mm
DIN EN 12311 – 2A
Elongation lengthwise
& across
approx. 30%
approx. 150%
DIN EN 12311–2A
Air tightness a < 0.1 m³ / (m·h·(daPa2/3)), airtight DIN 4108, based on
DIN 18542
Tightness for driving rain up to 600Pa DIN 18542
Water pressure resistance > 200cm water column DIN EN 20811


The bonding surfaces must be smooth dry, free of oil, grease and dust, and firm, stable, and load bearing. The jambs and reveals have to be smoothed out according to Din 4108, part 7 for installation of Winflex® Optima. Especially in low temperatures, it must be ensured that all bonding surfaces are free of any frost and ice. Application may require a primer e. g. for solidification of sanding surfaces. We recommend our Multi Primer for this purpose. Application at 0 to – 10 °C will reduce initial adhesion.

Although application is possible at such temperatures, high final strength will need longer time of contact.

Winflex® Optima Duo:

Spool Winflex® Optima off the reel and cut to length with at least 5 cm to spare. Peel the cover foil off the self-adhesive strip and press the latter to the back of the window frame. Proceed in this way on all sides of the window frame to be sealed. The window frame can now be aligned and fastened. The cavity between window and wall can now be filled with the requisite volume of insulating material. Our Vitaseal TRS 600 is suited for this purpose. The split protective foil on the full-surface self-adhesive layer is peeled off as required and the tape carefully pressed onto the substrate. Ensure that the tapes overlap in the corners! Use a pressure roller to achieve optimal initial adhesion.


Size Box Quantity Status
55/15(70mm)X40m 5 Stock item
85/15(100mm)X40m 3 Stock item
135/15(150mm)X40m 2 Stock item
185/15(200mm)X40m 2 Stock item
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