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Technonicol roofing mastic #21 (Technomast) - TECHNONICOL

Application areas

Application areas for TECHNONICOL roofing mastic #21:
– Installation of mastic roofs and repair of all kinds of roofs;
– Waterproofing of engineering structures (basements, cellars, piles and other facilities buried in the ground or coming in contact with the damp environment);
– Waterproofing and anticorrosion treatment of metal surfaces, including pipelines, car bodies.

Description of material

TECHNONICOL roof mastic #21 is a material that is completely ready to use, consisting of oil bitumen, modified by artificial rubber, mineral fillers and organic solvent. After drying, it forms a high-strength covering with a wide range of operating temperatures, which considerably increases the service life of the protected structures.

Method of application

Mastic is applied to a processed surface using a paint brush, filling knife or by pouring and levelling. Mastic surface coverage: for mastic roof installation — 3.8–5.7 kg/m2; for waterproofing installation — 2.5–3.5 kg/m2.


Store in a dry place protected against sunlight at a temperature between –20°C and +30°C. Guaranteed storage period — 12 months.


Strength of adhesion to the base, MPa, not less than  with concrete 0,6 
with steel 0,9 
Strength of adhesion between layers, MPa, not less than  roll-fed material — roll-fed material 0,3 
roll-fed material — concrete 0,4 
Shear strength of glued bond, kN/m, not less than 
Nominal strength, MPa, no less than 
Specific elongation when broken, % 500 
Water absorption over the course of 24 h, % by weight, not less than 0,4 
Mass fraction of non-volatile substances, %, not less than 50 
Heat endurance, °С, not less than 110 
Flexibility on R=5.0±0.2 mm beam at –50°C no cracks 
Water resistance during 24 h at a pressure of 0.1 MPa withstands 

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