APPA-1 Waterborne Damp-Proof Anti-Corrosion Primer for Cooling Towers

Overview
Single-component waterborne damp-proof anti-corrosion primer for cooling tower internal walls and concrete structures.​

Composition
APP (atactic polypropylene) water emulsion, waterborne epoxy emulsion, pigments, stabilizer, protective agent, flame retardant, and additives.​

Typical uses
For damp-proof and anti-corrosion protection of power plant cooling tower internal walls, tunnels, basements, gates, bridge piers, cavities, and buried pipelines.​

Technical data (typical)

• Appearance: primer iron red or grey; topcoat various colors.​

• Theoretical consumption: primer 0.17 kg/m² at 50 µm DFT (loss not included).​

• Theoretical consumption: topcoat 0.2 kg/m² at 50 µm DFT (loss not included).​

• Density: primer 1.4 kg/L; topcoat 1.3 kg/L.​

• Drying time (25°C): surface dry 1 h; hard dry 24 h; full cure 7 d.​

• Acid resistance: 3% H2SO4, 48 h.​

• Alkali resistance: 3% NaOH, 48 h.​

• Salt resistance: 3% NaCl, 48 h.​

Application data (25°C)

• Mixing: single-component.​

• Induction time: none.​

• Pot life: unlimited.​

• Application methods: airless spray, brush.​

• Thinner: water, ≤7%.​

• Recoat interval: min 12 h; max 7 d.​

• Recommended DFT per coat: 30–50 µm (brush 30–40 µm).​

Surface preparation
Steel: blast to Sa 2.5 or power-tool clean to St 3; surface profile 30–75 µm.​
Concrete: sound, clean, and level; moisture content ≤6%; repair defects before coating; apply sealer primer where specified.​

System compatibility / packing / storage

• System compatibility: APPA-1 waterborne damp-proof anti-corrosion primer + APPB-2 waterborne damp-proof anti-corrosion topcoat.​

• Packing: 22 kg.​

• Storage: store at ≥5°C, dry, cool, and ventilated; away from fire; avoid strong sunlight; no outdoor storage.​

• Shelf life: 12 months.