BIRSS Overlak / Overlak semi-matt — epoxy floor sealer
Clear water-emulsifiable epoxy sealer, gloss or semi-matt — a finish for self-levelling floors, chip-broadcast coatings and concrete.

This binder is used to lay terrazzo floors: the epoxy compound binds the marble filler into a monolith in which patterns and logos can be laid out. The system is built on BIRSS Kharts primer, and the binder colour is matched to RAL. Such floors are designed for high-traffic areas — railway stations, ports, exhibition halls, restaurants and hotel lobbies; bond to concrete is at least 2 MPa with failure in the concrete.
| Manufacturer | BIRSS — AO “Opytny Zavod Sukhikh Smesey”, Moscow |
|---|---|
| Type | epoxy floors |
| Use | retail and public, decorative |
| Base | epoxy compound — decorative terrazzo binder with marble filler |
| Colour | RAL colour, tinted to order (subject to agreement) |
| Packaging | metal pails, kit (A+B) 25 kg |
| Application method | system: BIRSS Kharts primer → marble filler → Multipol Terrazzo with marble filler 1–5 or 2–5 mm |
| Application temperature | not below +15 °C; substrate +15…+30 °C (3 °C above the dew point) |
| Curing | drying to degree 3 — 8–12 h; further work after 24 h; foot traffic after 3 days; full cure after 7 days |
| Key properties | specific gravity 1.48 g/cm³; pot life at least 30 min; Shore hardness 80; bond to concrete at least 2 MPa (failure in the concrete); service temperature −30…+90 °C (wet exposure up to +65 °C); chemical resistance: alkalis 8 % |
| Layer thickness | about 5–6 mm; about 14–15 mm |
| Consumption | 5–6 mm system: Kharts 0.2–0.5 + marble filler 1–5 mm 2 kg/m² + Multipol Terrazzo 6.5 kg/m² + marble filler 6 kg/m²; 14–15 mm system: Kharts 0.2–0.5 + filler 2–5 mm 2 kg/m² + Multipol Terrazzo 8.6 kg/m² + filler 23 kg/m² |
| Shelf life | not more than 12 months in closed original packaging; protect from sunlight, heat and freezing |
| Standards | TU 2257-018-05668056-01 with amendments No. 1, No. 2 |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Clear water-emulsifiable epoxy sealer, gloss or semi-matt — a finish for self-levelling floors, chip-broadcast coatings and concrete.
Three-component solvent-free epoxy impregnation for fresh and old concrete floors: hardens the surface and slows water evaporation.
Thixotropic mix with fibre for columns, beams and balconies at temperatures from −15 to +5 °C; in frost it reaches 55 MPa in compression in 28 days.
Water-emulsifiable epoxy conductive sealer — the intermediate electrically conductive layer of the BIRSS Leytpol antistatic floor system.
Rapid-hardening polymer-cement mix for small defects of exposed concrete, steps, stairs and fine finishing; aggregate size 0.315 mm.
Corundum hardening mix for heavy-duty concrete floors: compressive strength at least 65.0 MPa, abrasion 0.4 g/cm².