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Khimtrast Hand-Applied Polyurea 1K — one-component waterproofing mastic
KHIMTRAST

Khimtrast Hand-Applied Polyurea 1K — one-component waterproofing mastic

Mastics and liquid membranes

Despite its name, this is not a sprayed system but a one-component isocyanate-based composition that cures with air moisture and is applied by hand: with a short-nap roller, brush, airless spraying or by pouring and spreading with a squeegee. It is used for basement walls, foundations, floor slabs, intermediate waterproofing under screeds and non-trafficked roofs, where a UV-protective enamel is needed on top. Elongation at break is at least 300%, adhesion to concrete and metal at least 1.0 MPa, service from −40 to +60 °C.

Specifications

ManufacturerKhimtrast — AO “Khimtrast”, Nizhnekamsk
Typemastics and liquid membranes
Usefoundations and basements, roofs, indoor rooms
Baseone-component isocyanate-based waterproofing composition: a solution of synthetic polymers in an organic solvent with pigments, defoamers and catalysts; cures with air moisture and solvent evaporation; non-volatile content at least 75%; Brookfield viscosity at 25 °C 2,000–5,000 mPa·s
Colourgrey (homogeneous suspension); other colours by agreement with the customer
Packagingmetal bucket 25 l – 20 kg
Application methodwaterproofing of concrete, metal, brick, plaster, polyurethane: basement walls, floor slabs, foundations, intermediate waterproofing under screeds, non-trafficked roofs (with UV protection by Khimtrast PU Enamel for polyurea); after opening, stir for 5 min with a low-speed drill (especially the bottom layer), let stand for 10 min; substrate moisture max 4%, after precipitation — drying with hot air and wiping with solvent; concrete — cleaning, filling, Primer-PM (1K) primer, the product after 24 h; metal — abrasive treatment, degreasing, Primer-PM (2K), after 24 h; over sprayed polyurea — after a 24 h wait; short-nap nylon roller, brush, airless spraying for high-viscosity compounds or pouring and levelling with a squeegee or spatula; 2 coats, the next after 24 h; dilution with toluene max 5% by weight; reinforce junctions and vertical surfaces with geotextile, glass mat or glass fabric; do not apply during precipitation; not recommended on PU foam (low adhesion); tools — acetone, toluene, xylene
Application temperaturenot below +5 °C; curing slows down as the temperature drops
Curingcuring max 24 h (+23 °C, humidity 50%, thickness up to 1 mm); full cure and strength gain max 7 days
Key propertiestensile strength at least 2.0 MPa; relative elongation at break at least 300%; water absorption in 24 h max 2.0%; watertightness at a pressure of 0.001 MPa for at least 72 h; Shore A hardness 40–50; service temperature from −40 to +60 °C; not UV-resistant (over time becomes matt, changes colour, loses strength and elasticity)
Layer thickness0.3 mm in 1 coat, 0.6 mm in 2 coats; maximum coat thickness 2 mm
Consumptionmax 0.45 kg/m² for a finished coating thickness of 0.3 mm (1 coat), 0.9 kg/m² at 0.6 mm (2 coats) (laboratory; actual consumption is 5–40% higher)
Shelf life6 months from the date of production; storage at +5…+30 °C in closed original packaging without access of moisture; use up opened containers completely or purge with dry inert gas
StandardsTU 20.30.22-98-27903090-2022 (amend. No. 1); voluntary certificate of conformity ROSS RU.32001.04IBF1.OSP28.89866, 27.11.2025–26.11.2028

Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.

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