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Mapeflex AC4 is used to seal internal and external expansion and construction joints subject to a medium amount of movement and surface cracks in all types of absorbent building materials. Some application examples · Seal joints between precast concrete panels with movement up to 12.5%. · Seals between precast concrete panels, wood and plaster board. · Seals between concrete elements, plaster, brickwork, light-weight cement, wood, natural stone, etc. · Airtight and waterproof seals between wooden frames and masonry. · Flexible tight seals between doors, roller-blind caissons and masonry, and between walls, ceilings, wooden panels and insulation panels. · Sealing joints between insulation panels and external building features (doorsteps, windows, window-sills, cornices, etc.) in thermal cladding systems. TECHNICAL CHARACTERISTICS Mapeflex AC4 is a one-component, acrylic, resin-base, thixotropic paste in water dispersion. It is easy to apply on both horizontal and vertical surfaces. Mapeflex AC4 seals remain unaltered even after many years of exposure to severe weather conditions, industrial environments and thermal gradients. They remain flexible at temperatures as low as -30°C and resist to temperatures up to +80°C (+100°C for short periods). Their resistance to chemical agents (for diluted acids and alkalis only) is good. However, given the large number of products and operating conditions, it is best to carry out a few tests before using Mapeflex AC4. Its resistance to water is good as long as it is not permanently immersed. When painting over Mapeflex AC4, always use elastomeric paint such as Elastocolor Paint. In case of porous or absorbent substrates, the sealant can be painted over after only 20 minutes or after complete hardening. We recommend carrying out preliminary tests to make sure the sealant and paint are compatible. Mapeflex AC4 complies with EN 15651-1 standard (“Sealants for façade elements”) with performance rating F-EXT-INT. Mapeflex AC4 is certified as very low emission of volatile organic compounds (VOC). 

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