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Mapei Mapesil LM Silicone Sealant 310ml

£15.00 (inc VAT)



Mapei Mapesil LM Silicone Sealant is a neutral, mould-resistant silicone sealant with very low emission level of volatile organic compounds (VOC), for use with natural stone and marble.

Mapei Mapesil LM Silicone is available in the following colours: 100 White, 110 Manhattan 2000, 111 Silver Grey, 112 Medium Grey, 113 Cement Grey, 114 Anthracite, 120 Black, 130 Jasmine, 132 Beige 2000 and 999 Transparent.

Mapei Mapesil LM Silicone Sealant is a solvent-free sealant with a low modulus of elasticity, specially formulated for sealing all materials sensitive to acids and plasticising agents, marble, granite, sandstone and quartz due to its chemical nature which deters surface bleeding or the migration of plasticising agents which would otherwise stain the substrate. The chemical characteristics of Mapei Mapesil LM Silicone also make it perfectly suitable for particularly delicate materials such as bricks, cellular concrete and varnished or enamelled wood.

Mapei Mapesil LM generally forms an excellent bond on non-absorbent substrates too, such as glass, ceramic, clinker, enamelled surfaces, water and solvent-based varnish, metals in general and on various types of plastic. It is also suitable for contact with absorbent mineral substrates such as concrete, render and fibre-cement. This product generally forms a good bond on the above substrates even if a primer is not applied beforehand (contact the MAPEI Technical Services Department before). Performs well in treated water typically found in swimming pools.

Thanks to the low modulus of elasticity of Mapei Mapesil LM Silicone, it is suitable for sealing internal and external fillet and expansion joints, including those subject to high levels of movement when in service, between: Pre-fabricated panels, window/door fittings and wall surrounds, pipe-work and vertical walls, similar and/or different types of coating materials. It is also suitable for sealing joints in doors with limited pedestrian traffic.

Mapei Mapesil LM does not emit unpleasant odours, and comes 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. Seals made using Mapei 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.

Mapei Mapesil LM Silicone delays the formation of surface mould. Mapei Mapesil LM 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.

Mapei Mapesil LM 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). Mapei Primer FD must be applied beforehand in the case of prolonged immersion in water. If in doubt, please contact the MAPEI Technical Services Department or carry out preliminary tests beforehand.

Mapei Mapesil LM is particularly suitable for surfaces sensitive to acids on which conventional neutral or acid sealants normally provoke changes in colour or staining of the substrate.

Do not apply Mapesil LM Silicone 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 Mapei Mapesil LM for sealing doors subject to intense traffic – (use Mapeflex PU45, Mapeflex PU20 or Mapeflex PU21).

Under certain conditions Mapei Mapesil LM Silicone 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 Mapei Primer FD when sealing stone or marble.

Application Procedure:
Surfaces to be sealed must be solid with no dust or loose parts and free of all traces of oil, grease, wax, old paintwork and rust. In order to perform correctly, the sealant must be able to expand and contract freely once it has been applied in the joint. It is important, therefore, that it only bonds perfectly to the side walls of the joint and not to the bottom, and that the width of the joint is calculated correctly so that the product does not expand more than 25% of the initial width of the joint when in service.

It is also important that the thickness of seals using Mapei Mapesil LM is as indicated in the table provided on the product datasheet linked below. Also, to protect the substrate from staining, apply masking tape along the edges of the joint before extruding Mapei Mapesil LM. Regulate the depth of the joint to avoid Mapei Mapesil LM sticking to the bottom by inserting Mapefoam polystyrene foam cord in the joint.

Mapei Mapesil LM comes in 310 ml cartridges. Cut the tip of the cartridge near the thread and screw on the nozzle. Trim the tip of the nozzle at 45° according to the width of joint required and insert the cartridge into a suitable extrusion gun. Finish the surface of Mapei Mapesil LM with a suitable damp tool or a tool dipped preferably in soapy water before the skin forms on the surface.

When Mapei Mapesil LM is exposed to the air, the surrounding humidity sets off the cure reaction and the sealant becomes flexible. The surrounding temperature only has a small impact on the cure rate of Mapei Mapesil LM, while the level of humidity in the surrounding air has the most influence. We highly recommend that the product is never applied if the temperature is below 0°C.

Technical Data:
Classication according to EN 15651-1: F-EXT-INT-CC
Classication according to EN 15651-2: G-CC
Classication according to EN 15651-3: XS1
Classication according to EN 15651-4: PW-EXT-INT-CC
Consistency: thixotropic paste
Available Colours : 100 white, 110 grey, 111 grey, 112 grey, 113 grey, 114 anthracite, 120 black, 130 jasmine, 132 beige and transparent
Density according to ISO 1183 Met. B (g/cm³): 1.02
Dry solids content (%): 100
EMICODE: EC1 Plus – very low emission
APPLICATION DATA (at +23°C – 50% R.H.)
Application temperature range: from +5°C to +40°C
Extraction rate from a 3.5 mm nozzle at a pressure of 0.5 MPa (ml/min.): 50-70
Time to form surface skin: 15 minutes
Tensile strength according to ISO 8339 (N/mm²): 0.5
Elongation at failure according to ISO 8339 (%): 250
Tear resistance (ISO 34) (N/mm²): 4
Shore A hardness (DIN 53505): 21
Modulus of elongation according to ISO 8339 – Method A at 100% elongation (N/mm²): 0.35
Maximum permitted movement in service (%): 25
Resistance to water: excellent
Resistance to ageing: excellent
Resistance to atmospheric agents: excellent
Resistance to chemical agents, acids and diluted alkalis: good
Resistance to soap and detergents: excellent
Resistance to solvents: limited
Resistance to temperatures: from -40°C to +150°C

Product Datasheet

Click here to view this product on the Manufacturers website.

Additional information

Weight N/A

100 White 310ml, 110 Manhattan 310ml, 111 Silver Grey 310ml, 112 Medium Grey 310ml, 113 Cement Grey 310ml, 114 Anthracite 310ml, 120 Black 310ml, 130 Jasmine 310ml, 132 Beige 310ml, 999 Transparent 310ml