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New Hybrid Filler to apply up to Temperatures of 50 °C

ESSEN/GERMANY, September 4, 2013 - The application of fine or dispersion fillers is hampered by certain risks, particularly at high temperatures: frequently, dispersion fillers develop a skin, while freshly applied cement-bound fine fillers can become “parched”, i.e. overdry, at the surface. MC-Bauchemie has developed a completely new binder combination for its hybrid filler Nafufill SF, a compound of cement and plastics that precludes these specific application risks. Nafufill SF is easy, safe and efficient to apply up to temperatures of 50 °C, and is suited to a wide range of different substrates including normal, lightweight and cellular lightweight concrete, plastered surfaces, lime sand brick and fast-adhering aged coatings.

new hybrid filler Nafufill SF from MC-Bauchemie

Nafufill SF offers many application possibilities: trowelling, rubbing-down, grinding or skimming. | photo: MC-Bauchemie

Nafufill SF hybrid filler is suitable for use on concrete components of new and existing structures, and for both internal and external applications where there is no contact with foot or wheeled traffic. It eliminates pores, blowholes, roughness, grooves and scratches, creating an aesthetically pleasing surface in the process. Its primary benefit lies in its exceptional application capabilities, remaining usable even at air and substrate temperatures of up to 50 °C. This significantly extends its pot life, particularly in the summer months, and allows planners and applicators a large time window for performing such filling work. In turn, this ultimately results in increased planning and site coordination reliability.

Easy to apply and post-curing-free

Cost and time-intensive post-curing, something that is quite usual in cement-bound fine fillers, is not necessary with Nafufill SF. Suitable for both hand and spray application, this hybrid filler is flexible in use and particularly suitable for performing filling jobs under extreme conditions, such as those encountered in bridges, tunnels, cooling towers and high rise structures. Here, classic post-curing processes are often significantly hampered and may even be impossible.

Because of the fine aggregate used to formulate Nafufill SF – maximum particle size just 0.1 mm – and the very good adhesive bond that it produces, savings can also be made when it comes to preparing the substrate. With new or well maintained concrete, sweeping is generally enough, while fast-adhering aged coatings frequently only require a surface clean. Low levels of filler consumption and the possibility of mixing just the right amounts for the job in hand serve to additionally reduce cost.

Cracks that can occur due to stresses between the substrate and the filler layer are avoided when using Nafufill SF. The reason for this lies in its low dynamic modulus of elasticity of just 8,500 N/mm2. This hybrid filler has been tested in various surface constructions involving different protection systems and is on the approved list of the German Federal Highway Research Institute (BASC).