Mapesil LM is a one-component, solvent-free, neutral-cure silicone sealant which does not emit unpleasant odours, available in the form of a thixotropic paste. It is easy to apply on vertical and horizontal surfaces and cures at room temperature through the humidity present in the air to form a flexible sealant. Its chemical characteristics  also make it perfectly suitable for particularly delicate materials such as bricks, cellular concrete and varnished or enamelled wood.

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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:
• Generally forms a good bond on the above substrates even if a primer is not applied beforehand - contact our technical team beforehand on 0113 2455450 (option 2) or send a message to [email protected]
• Seals made using Mapesil LM are extremely stable over time, even when exposed to inclement weather, industrial environments, temperature variations or water. The product remains flexible over a temperature range of between -40°C and +150°C
• Delays the formation of surface mould
• Generally offers good resistance to chemical agents. However, because of the wide range of products and service conditions, if in doubt carry out preliminary tests beforehand
• Bonds perfectly to most types of substrate used in the building industry without applying a primer beforehand (glass, ceramic, marble, aluminium, zinc-plated sheet metal, concrete, stainless steel and PVC)
• Primer FD must be applied beforehand in the case of prolonged immersion in water. If in doubt, please contact Mapei or Rawlins Technical team or carry out preliminary tests beforehand
• Particularly suitable for surfaces sensitive to acids on which conventional neutral or acid sealants normally provoke changes in colour or staining of the substrate
• Complies with EN 15651-1 norm (“Sealants for internal and external façade elements”) with performance rating F-EXT-INT-CC, with EN 15651-2 norm (“Sealants for glazing”) type G-CC, with EN 15651-3 norm (“Sealants for joints in sanitary areas”) type XS1 and EN 15651-4 norm (“Sealants for pedestrian walkaways”) with performance rating PW-EXT- INT-CC

Recommendations & Limitations

• Do not apply Mapesil LM on rubber, heavily-plasticised plastics or bitumen. The oil and plasticising agents in the substrate may migrate to the surface and compromise the bond or penetrate into the sealant leading to a variation in colour and mechanical characteristics
• When Mapesil LM is constantly immersed in treated water typically found in swimming pools its physical-mechanics may be affected prematurely. Given the wide range of products used to treat water and the actual quantities employed, its suitability over long periods may only be guaranteed following specific laboratory testing
• Do not use Mapesil LM for sealing floors subject to intense traffic (use Mapeflex PU45, Mapeflex PU20 or Mapeflex PU21)
• Under certain conditions Mapesil LM may have a water-repellent effect along the edges of joints. This effect is only noticeable when surfaces are wet and is invisible when the same surfaces are dry. This phenomenon, however, has no effect on the product’s performance characteristics
• Do not use Primer FD when sealing stone or marble

Application & Preparation

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