Mapesil AC is a one-component, acetic crosslinking, solvent-free silicone sealant, available coloured or transparent. It is a thixotropic paste which is easy to extrude both horizontally and vertically. It crosslinks following exposure to atmospheric humidity at ambient temperatures.

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• Features & Benefits
• Recommendations & Limitations
• Application & Preparation

Features & Benefits

• Seals remain unchanged even after many years exposure to climatic extremes, industrial pollution, sudden temperature changes and immersion in water. Mapesil AC forms an elastic barrier with the following properties:
• Excellent durability
• High elasticity
• Excellent bonding to glass, ceramic and anodised aluminium
• Mildew resistant
• Waterproof and permeable to vapour
• Resistant to chemical agents
• Flexible down to -40°C and resistant to temperatures at +180°C
• Easily workable
• In compliance with ISO 11600 norm, it is classified as F-25-LM
• In compliance with EN 15651-1, EN 15651-2, EN 15651-3 and CE-marking
• In compliance with numerous international standards

Some application examples:

• Sealing joints in wall and floor coverings of ceramic and cement, provided they are not subject to heavy abrasion
• Sealing joints between sinks or sanitary ware and ceramic tiles in kitchens, bathrooms and showers with colours coordinated with the Mapei coloured grout ranges
• Sealing expansion joints in swimming pools
• Assembling compositions of glass tiles and artistic stained glass windows
• Sealing glazing, door, and window frames portholes, windows, and glass
• Sealing air ducts, and water pipes
• Sealing tanks, service pipes, and boilers
• Sealing of joints subject to high chemical and thermal stress
• Sealing materials of different thermal exposure coefficients

Recommendations & Limitations

• Do not use Mapesil AC for joints in exterior between ceramic tiles and light-coloured natural stone because dirt could accumulate by the joints. In such cases, please contact Mapei Technical Service to identify the most suitable solution
• For sealing surfaces sensitive to acids such as limestone, use a neutral silicone sealant (e.g. Mapesil LM)
• The use of Mapesil AC is not recommended on highly plasticised material or on bituminous surfaces because of the release of substances that reduce bonding and penetrate into the sealant, altering the colour and resistance
• The resistance of Mapesil AC to chemical agents is generally excellent; however, due to the numerous products and working conditions to which Mapesil AC can be applied, it is always advisable to do a sample test in cases of doubt
• Do not use Mapesil AC to seal aquariums
• For sealing floor joints subject to heavy traffic, use a polyurethane (e.g. Mapeflex PU 45 FT) or epoxy-polyurethane (e.g. Mapeflex E-PU 21 SL) sealant
• Where Mapesil AC is to be applied in areas of continuous immersion, i.e. inside a swimming pool tank, the joints must be primed using Primer FD

Application & Preparation

Please refer to the data sheets in the tab above for further information.