After curing, the thin-layer LAKHTA coating waterproofing turns into a hard W16 coating with compressive strength of 55 MPa and bond to concrete of 2.0 MPa. It is applied with a spatula or texture spray gun to concrete, reinforced concrete and brick, outside and inside structures — on walls, floors and ceilings, without separate levelling. The coating works under positive and negative pressure, retains vapour permeability and is UV resistant. The manufacturer’s instructions permit its use in drinking water tanks, and an expert opinion has been issued for the compound.
| Manufacturer | Rastro (LAKHTA, SLAVYANKA, Izhora) — ZAO “Rastro”, Bolshaya Izhora |
|---|---|
| Type | coating waterproofing |
| Use | foundations and basements, tanks and pools, drinking water, interiors |
| Base | one-component thin-layer cement compound (dry mix): Portland cement, quartz filler, active chemical additives; after curing — a hard waterproofing coating |
| Colour | grey dry mix |
| Packaging | paper bags with PE liner, 10 and 25 kg |
| Application method | substrate sound and even (cracks and cavities no deeper than 4 mm), cleaned; dampen without free water or prime with LAKHTA latex primer; mix with water at +20±2 °C as per the label, stir for 2 min, pause for 10 min, stir again; by hand with a spatula in two coats of 1…2 mm, the second coat not earlier than after 5 h; mechanised — with a texture spray gun (3…3.5 atm, nozzle 4…6 mm, ~0.5 m), two coats with a total thickness of 3…4 mm; horizontal, vertical and overhead surfaces; moist curing 3 days |
| Application temperature | not lower than +5 °C and not higher than +35 °C (air and structure, over a 24-hour period) |
| Curing | working time of the mortar mix not more than 60 min; second coat after 5 h; moist curing 3 days; painting and finishing not earlier than after 3 days |
| Key properties | water-tightness grade W16; increase in the water-tightness grade of concrete: 2 mm layer — 1 step (2 atm), 4 mm — 2 steps (4 atm); compressive strength 55 MPa; flexural strength 8.0 MPa; frost resistance F300, contact zone Fkz 50; bond strength to concrete 2.0 MPa; average density 2,000±10 % kg/m³; capillary water absorption 0.2 kg/m²·h^0.5, over 48 h 6 %; workability Pk3, workability retention 60 min, water retention 99.8 %; resistance to aggressive media (3<pH<13): magnesium 10,000 mg/l and ammonium 2,000 mg/l (highly aggressive), acidic pH3 and carbonic 80 mg/l (moderately aggressive), sulphate 1,000 mg/l (slightly aggressive); mineral oil, kerosene, AI-95 petrol 100 % — resistant; service under constant exposure to temperatures up to +250 °C; UV resistance; vapour permeability retained; suitability for drinking water tanks — permitted; hazard class 3 |
| Layer thickness | 2…4 mm for two-coat application (coat 1…2 mm); mechanised 3…4 mm; under negative-side water pressure up to 4 atm and in aggressive media — 4 mm |
| Consumption | 1.7 kg/m² per 1 mm of thickness |
| Shelf life | 12 months from the date of packing; in dry rooms in the manufacturer's packaging; at temperatures above +30 °C protect from direct sunlight |
| Standards | TU 5745-007-11149403-2001; GOST 31357-2007 |
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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