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• Features & Benefits
• Preparation
• Application
• Limitations

Features & Benefits

• Uses:
  • Flexible waterproofing seal of expansion joints subject to large amounts of movement in service
  • Flexible waterproofing seals in tunnels, road-works, etc
  • Sealing expansion joints in prefabricated panels
  • Sealing structural joints in façades
  • Sealing joints in hydraulic works, such as channels, basins, drains, pipe-work, etc
  • Waterproofing joints in road-works
  • Waterproofing expansion joints in flat covering layers (under tiles or using suitable protection such as a metallic profile)
• Either 17 cm or 32.5 cm wide tape, called respectively Mapeband TPE 170 and Mapeband TPE 325, 1.2 mm thick, sidelong reinforced with polyester non-woven fabric
• Must be applied by bonding with Adesilex PG4 two-component, low viscosity, thixotropic epoxy adhesive
• TPE, short for “Elastomeric Thermoplastic Polyolefine”, is the name given to a special group of polyolefines which combine the best properties of thermoplastic polymers and synthetic elastomer technology
• May be hot-welded with a Leister electronic hot air blower
• May be also joined by using the “cold-weld” technique by applying a contact adhesive, such as Adesilex LP solvented, poly-chloroprene adhesive, to both surfaces. This technique makes it easy to form linear joints or to create special pieces with the tape, to guarantee the waterproof integrity of the entire system
• Remains permanently flexible and deformable even at low temperatures
• Resistant to ageing even if exposed to atmospheric agents
• Excellent resistance to alkalis, bitumen, diluted lye, slightly acidic solutions and salt solutions

Preparation

• Surfaces on which Mapeband TPE is to be applied must be free from oil, grease and paint and must be free from dust and areas which are either uneven or loose
• Paintwork or coatings must be removed by sandblasting or with a sanding disc. This operation is essential if the surfaces have been treated with polyester, epoxy or polyurethane resin or if it is made from glassy material
• If Mapeband TPE is to be applied on metallic surfaces, remove all traces of rust, paint, grease, etc. by sandblasting down to bare metal. When Mapeband TPE is applied, the surface must be perfectly dry
• To obtain a joint with a clean, well-defined profile, apply masking tape around the outside surface of the joint, in order to obtain an area which is 1 cm wider than the width of the TPE tape to be spread with adhesive
• After laying, bonding and finishing off with a trowel, remove the masking tape

Application

• Firstly apply a 1-2 mm-thick uniform layer of Adesilex PG4 onto the clean, dry substrate with a smooth spatula; avoid applying the adhesive inside the joint
• Lay Mapeband TPE by pressing lightly along the non-woven sides of the tape. Make sure that all wrinkles and creases are eliminated and that air bubbles are not formed
• Apply a second layer of Adesilex PG4 while the first one is still fresh, completely covering the fabric strip with the new layer of adhesive
• Smooth off the product with a flat trowel. Once the second layer of Adesilex PG4 has been applied, sprinkle on a layer of 0.5 Quartz to create a rough surface and slowly remove the masking tape
• Mapeband TPE must be protected against damage (e.g. perforation) during the application process. If high levels of movement are foreseen, Mapeband TPE must be laid by forming an upside-down “W” (omega) shape on the inside of the joint
• Butt joints between two strips of Mapeband TPE must be carried out by overlapping and bonding at least 5 cm of the central part in TPE by either hot-welding or cold-welding
• To make the welding of the parts in TPE easier and firmer, press lightly with a flat carpeting roller

Limitations

• Do not use Mapeband TPE if it will come into contact with mineral oil, petrol or strong solvents (ketones, esters and hydrocarbons)
• Do not lay Mapeband TPE on surfaces which are not perfectly clean, dry or which are irregular
• Protect Mapeband TPE against perforation
• In case of permanent contact with liquids at high temperature it is advisable to previously evaluate the application of the product