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• Features & Benefits
• Recommendations & Limitations
• Application & Preparation
• Storage & Safety Instructions

Features & Benefits

• Hardens following its reaction with atmospheric humidity and its special characteristics offers a guarantee of long service life
• It may be used on both horizontal and vertical surfaces
• Ready to use and is available in both metal cartridges and soft cartridges equipped with a special extrusion gun, which makes the product particularly easy to apply
• The consistency of the product is ideal for quick application and its rapid-hardening characteristics allows the surface to be put into service quickly with resulting economic advantages
• Before painting over Mapeflex PU 45 FT make sure it is completely polymerised
• Mapei recommend using elastomeric paint such as Elastocolor Paint after treating the surface of the sealant with Colorite Performance. Always carry out preliminary tests to make sure the sealant and paint are compatible
• Some application examples:
• Used as a sealant
  • Industrial floors subject to vehicular traffic, including heavy vehicles
  • Concrete floors for internal and external car-parks, supermarkets, shopping centres and warehouses
  • Ceramic flooring and coatings, including in areas subject to intense traffic such as supermarkets and industrial environments where fork-lifts are in use
  • Concrete walls and general internal and external vertical structures where the use of a thixotropic product is required
  • Old concrete floors which are to be covered with a Mapefloor System
• Sealing expansion and distribution joints subject to movements up to 20% of the average width of the joint in:
• Sealing cracks
• Sealing pipe-work systems for air-conditioning and electric cables
• Sealing sheet-steel sections, such as flashing and guttering
• Sealing general fillet joints
• Used as an adhesive at thicknesses up to 3 mm
  • Tinwork and flashing
  • Skirting boards, cable beads, beading rods and corner guards
  • Pre-formed decorative elements
  • Bathroom fittings
  • Window sills
  • Roofing tiles, concave roofing tiles, covering panels and insulation panels
• The high bonding characteristics and rapid-hardening properties of Mapeflex PU 45 FT make it suitable for joining various materials and for bonding on a wide range of substrate materials
• Mapeflex PU 45 FT may be used to bond most building materials, for example cement and cement-based products, cellular concrete, bricks, steel, copper, aluminium, general pre-painted surfaces, glass, mirrors, gypsum, wood and wood- based materials, ceramics, clinker, insulating material, plastics such as PVC, acrylic glass and fibreglass
• When used to form flexible bonds, Mapeflex PU 45 FT is a multi-purpose product for constructing and finishing building works such as:

Recommendations & Limitations

• Do not use on dusty or flaky surfaces
• Do not use on damp surfaces
• Do not use to seal joints in stone and marble: use Mapei Mapesil LM
• Do not use on surfaces which are dirty with oil, grease or mould-stripping compounds, as the bonding could be compromised
• Do not use on bituminous surfaces where the bleeding of oil may be present
• Do not apply Mapeflex PU 45 FT if the temperature is below 5°C
• Do not contaminate the surface of the product with alcohol while still wet to prevent affecting its correct polymerisation
• When applied on particularly absorbent substrates, the edges of the joint may become darker

Application & Preparation

Preparation of surfaces to be sealed or bonded:

• All the surfaces to be sealed or bonded must be dry, sound and free of dust, crumbling parts, oil, grease, wax and old paint
• When used for sealing, Mapeflex PU 45 FT must only bond perfectly to the sides and not to the bottom
• Therefore, in expansion and contraction joints, place a suitable diameter of Mapefoam compressible, closed-cell expanded polyethylene cord at the bottom of the joint to leave a depth in the joint according to the table below:

• Mapeflex PU 45 FT withstands movements when in service up to 20% of the average width of the sealed joint
• If movements are greater than 20% when in service, use Mapei Mapeflex PU40 polyurethane sealant with a low modulus of elasticity
• To avoid the sealant spreading out of the joint, and to leave an attractive finish, we recommend using masking tape along the edges of the joints, which must be removed immediately after smoothing off the sealant
• Mapeflex PU 45 FT bonds well even without the use of a primer on substrates which are solid, free of dust and perfectly clean and dry
• We recommend applying a suitable primer if the absorbent surfaces are not solid enough, if they have a slightly powdery surface or if the joints are subject to high mechanical stress or frequent, prolonged contact with liquids
• When applied on non-absorbent surfaces such as iron, steel, aluminium, copper, ceramic, klinker, glass and zinc plated sheet, Mapeflex PU 45 FT forms a good bond if the surface is cleaned with a suitable degreasing product
• When applying on plastics, it may help to roughen the surface by using fine sandpaper and then to apply a coat of a specialist primer for plastic materials

Preparation and application of Mapeflex PU 45 FT when used as a sealant:

• Place the cartridge in the special extrusion gun, make a hole in the tip of the cartridge, screw on the extrusion nozzle (300ml only), cut the nozzle at an angle of 45° and dependent on the width required
• Squeeze out the product in a continuous flow into the joint
• Take care to avoid entrapping air in the joint
• Immediately after extruding the sealant, smooth over the surface with a tool with a suitable size and shape while keeping it continuously wet with soap and water

Preparation and application of Mapeflex PU 45 FT when used as a flexible adhesive:

• When bonding sections with a restricted surface area or weight, extrude single drops of the product on the back of the section and press it well down onto the substrate to spread the adhesive uniformly
• When bonding sections with a large surface area, extract a series of vertical, parallel beads around 15 cm apart and press on well to spread the adhesive uniformly
• If required, the bonded element may be adjusted within approx. 6 minutes of laying at a temperature of +23°C
• When bonding heavy loads or in critical laying conditions, extra support such as clamps or props may be necessary for the first 24 hours at +23°C
• Do not bond with layers of product more than 3mm thick

Storage & Safety Instructions

• Mapeflex PU 45 FT may be stored for 12 months in a cool, dry place in its sealed, original packaging
• May cause sensitisation if inhaled and allergic reactions in those sensitive to isocyanates
• While using the product, wear protective gloves and goggles and take the usual precautions for handling chemicals
• If the product comes into contact with the eyes or skin, wash immediately with plenty of water and seek medical attention
• Use a suitable device to protect the respiratory system
• For further and complete information about the safe use of the product please refer to the latest version of the Safety Data Sheet (see 'Data Sheets' section above)