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22 May 2012

Bituminous sealant for diverse applications

Mapei’s Mapeflex Blackfill, a bituminous sealant, is ideal for quick sealing and repair applications to most surfaces, including torch-on membranes.Mapei, an industry leader in construction chemicals and concrete technology and locally represented by Mapei South Africa, has introduced Mapeflex Blackfill, a one-component, flexible, bituminous sealant, to the South African building and construction market. 

This innovative sealant is manufactured from polymers with a soft solvent consistency and is ideal for quick sealing and repair applications on most surfaces, including torch-on membranes. 

Paul Nieuwoudt, product manager for building systems at Mapei South Africa, says, “Due to its soft consistency, Mapeflex Blackfill forms a plastic mass that is easily extruded and shaped. The product bonds to most substrates, including cementitious material, wood, bricks, metals and a number of plastics.” 

Mapeflex Blackfill can be used in various applications, for:

-          Localised seals on old bitumen membranes, without the laborious task of getting specialised heating equipment and gas on site;

-          Overlapping and filleting-in bitumen membranes;

-          Sealing air vents;

-          Immediately sealing gaps between construction features on flat and sloping roofs, including flues, skylights, aerials and guttering;

-          Collaring around pipe-work; and

-          Filling joints, cracks and gaps. 

The product is not prone to leaching and does not dissolve in water, so it can be exposed to rain immediately after application, and it does not run or drip, even when applied in wide sloping or vertical joints. 

Mapeflex Blackfill is not recommended for use in areas that carry pedestrian or vehicular traffic, or for applications subject to compressive, tensile, or continuous or snap shear stresses. 

Prior to the application of  Mapeflex Blackfill, surfaces should be dry, solid and free of dust, loose particles, oil, grease, wax, or old paintwork. “If the product is applied to damp or wet substrates, any stagnant water should be removed and the product must be pressed effectively into place,” says Nieuwoudt. Mapeflex Blackfill should not be used in temperatures below 5°C.

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