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Mapei Mapesil AC is a pure, solvent-free acetic silicone sealant for ceramic tiles, bathrooms, kitchens, wet areas and swimming pools. It combines high flexibility with mould-resistant BioBlock technology and is available in an extensive colour range coordinated with Mapei grouts.
Mapesil AC is the sanitary silicone in this range to choose when the installation is built around a Mapei tile and grout system and the silicone joint needs to match the surrounding grout colour as closely as possible.
Mapesil AC is available in a wide palette of colours plus transparent, allowing movement and perimeter joints to coordinate with Mapei grout finishes across bathrooms, kitchens, tiled walls and floors, showers and swimming pools.
Use Mapesil AC for elastic joints around ceramic tile installations, sanitary ware, sinks and other compatible wet-area details. It can also be used for internal and external ceramic joints in damp environments and swimming pools where an acetic-cure silicone is appropriate for the substrate.
Correct joint geometry allows the silicone to extend and compress freely. Use suitable closed-cell backing cord to control depth and prevent adhesion to the base of the joint. For 10 mm wide joints, depth is generally equal to width. For widths from 11 mm to 20 mm, maintain approximately 10 mm depth. Wider joints are generally designed at approximately half the joint width.
Mapesil AC is an acetic-cure silicone, so substrate compatibility matters. It is particularly strong on compatible non-porous materials such as ceramic and glass. For acid-sensitive stone or other substrates where acetic cure is unsuitable, use the appropriate neutral-cure Mapei sealant instead.
Choose Mapesil AC when the job is centred on Mapei tile and grout colours, compatible ceramic wet areas or swimming-pool joints.
Choose Adheseal S100 when you want a neutral-cure sanitary silicone with broader mixed-substrate flexibility and Adheseal's own tile and grout coordinating colour range.
Compare the full Sanitary Silicone Sealants range.
Can Mapesil AC be used in swimming pools?
Yes, on compatible substrates and correctly designed joints.
How much movement can it accommodate?
It is rated for ±25% movement and Class 25 LM.
Can it be used on limestone?
No. Its acetic cure is not suitable for acid-sensitive substrates such as limestone.
Can it be used in aquariums?
No. Do not use Mapesil AC to seal aquariums.
| Property | Value |
|---|---|
| Density (transparent colour) | 1.03 g/cm³ |
| Solid Content | 100 % |
| Application Temperature | +5°C to +50°C |
| Extrusion Rate | 120 g/minute |
| Skin Time | 10 minutes |
| Shrinkage | 3.5 % |
| Cure Rate | 4 mm in 1 day, 10 mm in 7 days |
| Tensile Strength | 1.6 N/mm² |
| Elongation | 800 % |
| Tear Strength | 4 N/mm |
| Shore A Hardness | 20 |
| Specific Gravity | 1.02 g/cm³ |
| Modulus | 0.20 N/mm² |
| Modulus of Elongation (ISO 8339 METHOD A - 50% elongation) | 0.27 N/mm² |
| Modulus of Elongation (ISO 8339 METHOD A - 100% elongation) | 0.35 N/mm² |
| Movement Capability | 25 % |
| Water Resistance | Excellent |
| UV Resistance | Excellent |
| Resistance to Atmospheric Agents | Excellent |
| Chemical Resistance | Good |
| Resistance to Soap and Detergents | Excellent |
| Resistance to Solvents | Limited |
| Temperature Resistance | –40°C to +180°C |
| Density | 1.03 (transparent colour) |
Here are some common examples on where Mapesil AC Silicone Sealant used by our customers.
