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Khimtrast PU Elastic Injection Foam — stopping leaks in cracks
KHIMTRAST

Khimtrast PU Elastic Injection Foam — stopping leaks in cracks

Injection waterproofing

On contact with water, the polyurethane resin of this system expands 28–32 times and turns into an elastic polyurethane foam that blocks the water-bearing crack. The foam is used for primary waterproofing of moving and static cracks with water pressure up to 0.5 atm, sealing voids and binding soil; the reaction rate is controlled by the amount of catalyst. The elastic foam compensates for deformation loads and does not shrink, and after the water inflow is stopped, Khimtrast PU Injection Resin 2K is injected through the same packers.

Specifications

ManufacturerKhimtrast — AO “Khimtrast”, Nizhnekamsk
Typeinjection waterproofing
Useleak repair, foundations and basements
Basewater-reactive polyurethane system: component A — polyurethane resin (viscosity at 25 °C 450–650 mPa·s, density 1,100–1,200 kg/m³), component B — catalyst (150–250 mPa·s, 950–1,050 kg/m³); forms an elastic polyurethane foam on contact with water; contains no ozone-depleting substances
Colourcomponent A — transparent homogeneous brown liquid; component B — transparent liquid with a yellow tint
Packagingcomponent A — 9 kg plastic canister; component B — 1 kg plastic canister
Application methodprimary waterproofing of water-bearing moving and static cracks with water pressure up to 0.5 atm, sealing of voids, binding of soil; mix A:B = 9:(0.6–1) by weight with a hand mixer at 300 rpm for 2–3 min at a component temperature of +15…+30 °C, remove the film that has formed; the reaction rate is controlled by the amount of component B (trial batches with water on site); holes 50–60 mm from the edge of the crack on each side at 40–50°, spacing ½ the substrate thickness but max 200 mm; injection with a one-component injection pump, vertical cracks — from bottom to top, move to the next packer when foam emerges or the limit pressure is reached; if there is not enough water in the structure — water injection before and after; after the water inflow is stopped — Khimtrast PU Injection Resin 2K through the same packers; remove or cut off the packers, fill the holes with cement mortar; water in the pump is not permitted, flush with acetone or ethyl cellosolve
Application temperaturenot below +5 °C (structure surface, ambient air, water)
Curingat 22–24 °C and A:B:water = 9:1:0.5 — start 5–10 s, rise 30–50 s; at A:B:water = 9:1:1 and water at +5…+30 °C — start 8–5 s, rise 130–60 s; at 9:0.6:1 — start 9–6 s, rise 210–144 s; pot life of the component mix at least 24 h
Key propertiesexpansion ratio 28–32 (24–26 at A:B:water = 9:0.6–1:1); for cracks with water pressure up to 0.5 atm; the elastic foam compensates for deformation loads, no shrinkage; cures on contact with water; service temperature of the finished PU foam from −50 to +80 °C; resistance to water and salt solutions
Shelf life12 months from the date of production; storage and transport at +10…+30 °C in closed original packaging
StandardsTU 20.16.56-113-27903090-2023; voluntary certificate of conformity ROSS RU.32001.04IBF1.OSP28.36546, 20.07.2023–19.07.2026

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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