LAKHTA R-245 — structural polyurethane resin for crack injection
Rigid low-viscosity polyurethane resin for bonding cracks and joints and restoring the load-bearing capacity of concrete; 80 MPa compressive.

SLAVYANKA one-component liquid rubber is a high-viscosity water-based bitumen-latex emulsion, ready to use right after stirring. It is applied by brush, roller or spatula for roof repairs, on junctions and seams of metal roofs, for waterproofing and corrosion protection of foundations and pipelines, and in showers and bathrooms. The coating elongates by 700 % before break, bonds to concrete and metal with a strength of 1.0 MPa and works from −65 to +110 °C. The mastic is non-combustible, and tools can be washed with water until it has cured.
| Manufacturer | Rastro (LAKHTA, SLAVYANKA, Izhora) — ZAO “Rastro”, Bolshaya Izhora |
|---|---|
| Type | mastics and liquid membranes |
| Use | roofs, foundations and basements, interiors, tanks and pools |
| Base | one-component water-based bitumen emulsion mastic (high-viscosity bitumen-latex emulsion), ready to use |
| Colour | paste from brown to dark brown; coating black |
| Packaging | 20 kg plastic buckets |
| Application method | clean the substrate of dust, oil and rust, repair if necessary, remove moisture by heating and dry it; a roof substrate must be dry and ventilated; stir for at least 5 min (ribbon mixer) without entraining air; apply with a spatula, roller or stiff brush in coats of no more than 1 mm with intermediate drying (on a poorly absorbent substrate, at low temperature or high humidity — 0.3…0.5 mm per pass); reinforcement with glass fabric, glass mesh, geotextile or polyester; do not apply in rain; wash tools with water before polymerisation |
| Application temperature | surface and air not lower than +5 °C; working temperature of the mastic not lower than +10 °C |
| Curing | tack-free (1 mm coat) 45…60 min; full polymerisation 24…48 h at +20±2 °C and relative humidity not more than 60 %; rain resistance after 1 h; final properties after 5 days |
| Key properties | nominal tensile strength 1.0 MPa; elongation at break 700 %; bond strength to concrete 1.0 MPa, to metal 1.0 MPa; water absorption over 24 h 0.5 %; flexibility on a R 5±0.2 mm bar −25 °C; heat resistance (5 h) +110 °C; water-tightness at 0.01 MPa for 24 h — no wet spot; Fraass breaking point −65 °C; solids content 62 %; vapour permeation resistance 1.5 m²·h·Pa/mg; service −65…+110 °C; contact with petrol, oils, petroleum products and organic solvents is not permitted; hazard class 4, non-combustible |
| Layer thickness | coat at least 1 mm dry film; recommended coating thickness 2 mm dry film |
| Consumption | 1.61 kg/m² per 1 mm dry film coat |
| Shelf life | 12 months from the date of manufacture; store at +5…+35 °C indoors or under a canopy; do not freeze |
| Standards | TU 5775-014-11149403-2010; compliance with GOST 30693-2000 and EN 1504-2:2004 |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Rigid low-viscosity polyurethane resin for bonding cracks and joints and restoring the load-bearing capacity of concrete; 80 MPa compressive.
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