S55-2 Polyurethane cooling tower damp-proof coating (primer/topcoat)

Overview
Two-component polyurethane damp-proof coating system for waterproofing and anti-corrosion.​
Provides strong adhesion, water resistance, damp-heat resistance, corrosion resistance, and mildew resistance.​

Composition
Formulated with polyurethane resin, impermeability pigments, anti-rust pigments, reinforcing materials, solvents, and additives.​
Cured with polyisocyanate; supplied in Part A & Part B packs.​

Typical uses
Waterproof and anti-corrosion for concrete structures and steel structures, including cooling towers, sewage tanks, mines, and underground buildings.​

Technical data (typical)

• Appearance: Primer—brown; topcoat—grey.​

• Theoretical consumption: Primer 0.16 kg/m² at 50 μm DFT; topcoat 0.13 kg/m² at 40 μm DFT (excluding loss).​

• Density: Primer 1.4 kg/L; topcoat 1.2 kg/L.​

• Drying time (25°C): Surface dry 1 h; hard dry 24 h; fully cured 7 d.​

Application data (25°C)

• Mixing ratio (Part A:Part B): Primer 24:3; topcoat 18:3.​

• Induction time: 5 min.​

• Pot life: 4 h.​

• Application methods: Airless spray, brush, roller.​

• Thinner: X-7 polyurethane thinner; dilution 3–7%.​

• Recoat interval (25°C): Min 12 h; max unlimited.​

• Recommended coats / DFT: 1 coat 40–60 μm; brush/roller 1 coat 30–40 μm.​

Surface preparation
Steel: blast/shot blast to Sa 2.5 or power-tool cleaning to St 3; surface profile 30–75 μm.​
Concrete: must be sound and dry (moisture content ≤6%), free of contamination; repair defects and apply after a sealing primer; for old coatings, roughen and remove chalked/loose parts.​

System compatibility / packing / storage

• Compatibility: S55-2 system—cooling tower damp-proof primer + topcoat.​

• Packing: Primer—Part A 24 kg, Part B 3 kg; topcoat—Part A 18 kg, Part B 3 kg.​

• Storage: Shelf life 12 months; store dry/cool/ventilated, away from fire and direct sunlight; no outdoor stacking.