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Duo Window Membrane HD

ME501 is a high strength, tear resistant membrane. It can be applied before or after window installation to suit onsite details & programming. Available with gasket options for fixing to profile.


ME501 provides a high performance seal to the perimeter joint between the window/curtain wall and the construction reveal.

Due to the intelligent, variable vapour permeability (sd value), when used in an internal UK (warm) environment, it will be vapour-tight, and when used in an external UK (cold) environment it will be vapour open.  This means that the membrane is suitable for interior and exterior use providing an air-tight and weather-tight seal whilst always complying with inside tighter than outside principles. 

The product meets the recommendations of the RAL Quality Assurance Association for windows and doors.  Successfully tested by MPA Hannover to EN1026 (airtightness) & EN1027 (weathertightness). The membrane is attached to the window with SP525 adhesive, enhanced acrylic adhesive + strip, or integral gasket and to the construction reveal material with SP525 adhesive.

  • Complies with principle of ‘inside tighter than outside’ in order to facilitate efficient vapour control
  • BBA accredited alternative to EPDM in many applications
  • Excellent drying potential (due to the membrane’s vapour permeability) avoiding mould growth and physical damage
  • UV stable  - will tolerate up to 9 months direct exposure prior to covering
  • Fully compatible with illbruck building protection membranes

Technical data

Property Test Method Result
Building Material Class DIN 4102 B2 (ABP P-NDS04-776)
Water Vapour Permeability EN ISO 12572 sd value between 0.21 and 15 m, depending on average atmospheric humidity, and acts as an intelligent vapour barrier
Weathertight Against Driving Rain  EN 1027 > 600 Pa
Airtightness DIN 18542 EN 1026 < 0.1 m3/[h m (daPa)n]
Adhesion of the Self-Adhesive AFERA 4001 P11 minimum 12 N/25 mm
Compatibility with Traditional Building Materials in Contact DIN 18542 Passed
UV Resistance of the Non-Woven Film Composite (Non-Woven Composite, Weathered Fleece Side Free) 9 months
Temperature Resistance -40°C to +80°C
Processing Temperature  +5°C to +45°C
Storage Period  1 year


*Gaskets K01,KO2,K03 are designed to fit various window types and aid instalation. For further details please speak with your Area Manager

*Acrylic+ aids instalation onto the face or side of the window/door profiles