Sazilast 503 — thixotropic polysulfide sealant of the 500 series
Thixotropic sealant for vertical and inclined joints of bridges and tunnels under mechanical load; tensile strength at break from 1.5 MPa.

Sazilast 24 Komfort is suitable for wide panel joints and facade cracks in above-ground parts of buildings: the formulation resists sagging better and covers a wide range of temperatures and joint sizes. The two-component polyurethane compound is applied by spatula at temperatures from −15 to +45 °C to a clean substrate that is damp but not wet. After curing, the joint withstands movement of ±25% and service from −60 to +70 °C, and elongation at break is at least 300%.
| Manufacturer | Sazilast (SAZI) — OOO PK “SAZI”, Ramenskoye |
|---|---|
| Type | joint sealants |
| Use | joints and junctions |
| Base | two-component non-shrinking polyurethane sealant (A — polyol, V — polyurethane prepolymer) |
| Colour | white, grey |
| Packaging | kits of 16.5 kg and 12 kg |
| Application method | mix components A and V with a low-speed drill at 300–350 rpm for at least 10 min; in cold weather condition to +15…+25 °C before mixing; do not add solvents or water; substrate damp but not wet, cleaned; a compressed polyethylene foam backer rod is placed in the joint (no three-sided adhesion); apply by spatula; working layer from 3 mm to 1/2 of the joint width |
| Application temperature | from −15 to +45 °C |
| Curing | pot life at least 6 h at 23 °C; full cure 7 days at 23 °C |
| Key properties | permissible movement amplitude ±25%; nominal tensile strength at break at least 0.2 MPa; elongation at break at least 300% (on joint specimens); cohesive failure; Shore A hardness after 24 h 20–30; flow not more than 2 mm; density 1.6 g/cm³; dynamic viscosity (0.3 / 13.5 s⁻¹, 25 °C) at least 1650 / not more than 90 Pa·s; service from −60 to +70 °C; predicted service life 10 conventional years (3 mm layer, ±25%) |
| Layer thickness | working layer at least 3 mm, not more than 1/2 of the joint width |
| Consumption | 96 g/linear m (20 mm joint, 3 mm layer) |
| Shelf life | 6 months at −20…+30 °C in undamaged packaging, protected from moisture, dust and direct sunlight |
| Standards | STO 032-37547621-2016; GOST R 59522-2021, classes 1 and 3P; certificate of conformity for “Sazilast 24” (manufacturer OOO PK “SAZI”, production — Ramenskoye) |
Data from the manufacturer’s technical data sheet. The coating system, number of coats and quantity are selected for your project on request.
Thixotropic sealant for vertical and inclined joints of bridges and tunnels under mechanical load; tensile strength at break from 1.5 MPa.
Thixotropic polysulfide sealant for joints in concrete, bridges, tunnels and metal roofs; tensile strength at break at least 0.7 MPa.
Two-component polyurethane sealant for panel joints and facade cracks in above-ground parts of buildings; permissible joint movement ±25%.
Two-component facade sealant for panel joints and cracks in above-ground parts of buildings; classic formulation, applied from −15 to +40 °C.
Thixotropic polysulfide sealant for vertical and overhead joints of bridges, tunnels and roofs; applied at temperatures from −15 to +40 °C.
Polyurethane sealant for facade panel joints; according to the data sheet, not used in roof elements or joints with prolonged water contact.