Ultimate Performance for Durable Sealing in Construction
 
Partel CONLEX BUTYL is a premium-quality, polymer-modified butyl tape engineered for high-performance air and watertight sealing in both interior and exterior applications. Designed with unmatched flexibility and adhesion, it's ideal for sealing complex details such as sill flashings, parapets, window junctions, and irregular geometries.
 
Whether you're working on timber frames, concrete, steel, OSB, masonry, or vapour control layers like PE, PA, or PP, CONLEX BUTYL delivers a reliable, long-lasting seal — even in extreme temperatures and challenging conditions.
 
Suitable for the creation of permanent airtight and/or windtight connections of windows and doors and service penerations.
 
📹 Watch it in Action:
See installation video
 
DIMENSIONS
300mm x 20m (11 13/16" x 65'-6/8")
 
IDEAL FOR
Sill flashing and window junctions
Parapets, edge sealing, and façade connections
Sealing underlay joints, internal/external vapour control layers
Retrofit and new build airtightness systems
 
APPLICATIONS
Internal and external use
Creating permanent air and watertight seals at parapets and sills, and can also be used for joining various materials
Sealing of edges, corners and other geometric, irregular shapes that require greater flexibility of the adhesive tape
Use with all Partel interior and exterior membranes
Other construction membranes including PE, PA, PP and aluminium
Bonding to timber, OSB, plaster, masonry, concrete, PVC, metal
300mm CONLEX BUTYL tape is ideal for hermetically sealing between counter battens and Partel’s exterior membranes for roof structures
 
WHY PARTEL CONLEX BUTYL TAPE?
Extremely flexible – can be moulded to irregular shapes and surfaces
Airtight connections to DIN 4108-11
High moisture repellent – Class W1 resistance to water penetration
Butyl rubber base tape with high tack
Strong adhesion and high shear strength
Resistant to frost
Maintains flexibility even under extreme humidity conditions and critical temperatures
Polymer-modified butyl with excellent ageing resistance
Strong adhesion and high shear strength
Lifetime design – extremely durable
Solvent free adhesive, with very low emissions
Outdoor exposure up to 3 months
 
* Adhesion: Before sticking tapes the surface should be clean and dry, water repelling substances are not suitable for adhesion. Use Primers (Acraprime) on porous or masonry surfaces. Adhesion is assured on all Partel membranes, planed timber, painted timber, plastics, and metals. The more suitable the surface for adhesion the better the results, Folds, creases or substrate issues impact on the system. It is the responsibility of the applicator to perform adhesion tests prior to proceeding - where required. It is necessary to apply pressure using Partel ‘Helping Hand’ applicator. Tapes are not designed for tensile strains.
 
Photo images are generic of product and may not represent your item size.