Ready to use solvent-based roofing and waterproofing polymer-bitumen mastic

Ready to use roofing and waterproofing bitumen mastic TECHNONICOL No.21 presents a mix of high-quality bitumen, special polymers, mineral fillers and organic solvents. Coatings on its basis are very flexible, heat and moisture resistant and have an excellent adhesion with the base. After drying, it forms a high-strength waterproofing layer that considerably increases the service life of protected structures. The mastic can be used within a wide range of operating temperatures thanks to added polymers.

Mastic TECHNONICOL No.21 is used for:

  • installation of mastic roofs and repair of old roofs;
  • waterproofing of underground structures (foundations, basements, piles, etc.);
  • waterproofing and anti-corrosion treatment of metal surfaces, including car bodies.

The mastic is applied to a surface layer by layer by brush or spatula. A layer can be also installed by pouring and leveling. The thickness of one layer should not exceed 1.5 mm. Every following layer is applied after the previous one becomes dry. Application of at least 2 mastic layers is recommended for reliable waterproofing of underground structures, 3 layers are recommended for installation of mastic roofs.

The product should be stored in a dry place protected from direct sunlight at temperatures from -20°C to +30°C. Shelf life – 18 months.

Product technical data

Adhesion strength with concrete, MPa ≥0.6
Adhesion strength with metal, MPa ≥0.9
Adhesion strength between bitumen material – bitumen material, MPa ≥0.3
Adhesion strength between bitumen material – concrete, MPa ≥0.4
Shear strength of the adhesive bond, kN/m ≥4.0
Nominal strength, MPa ≥1.0
Elongation at break, % ≥500
Mass fraction of non-volatile substances, % ≥50
Heat resistance, °C ≥110
Flexibility on R=5.0±0.2 mm beam at -35°C no cracks
Water absorption over the course of 24 h, % ≤0.4
Watertightness during 24 h at a pressure of 0.1 MPa pass
Consumption for installation of 1 layer, kg/m² 1.2–1.9
Bucket volume, kg 3, 10, 20