APP-81/61 APP Polypropylene Pipeline Anti-Corrosion Primer/Topcoat

Overview
Single-pack anti-corrosion pipeline coating system supplied as primer (APP-81) and topcoat (APP-61), applicable down to -10°C.​

Composition
Modified polypropylene (APP), neoprene rubber, synthetic resins, pigments/fillers, protective agents, stabilizers, solvent.​

Typical uses
Anti-corrosion protection for buried pipelines in metallurgy, power, petroleum, chemical, tap water, coal gas, natural gas, oil and gas transmission, and district heating (≤150°C).​
Also suitable for demineralized water tanks, sewage tanks, and power plant circulating water systems; suitable for concrete facilities.​

Technical data (typical)

• Appearance: primer reddish brown; topcoat black.​

• 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 1.40 kg/L; topcoat 1.2 kg/L.​

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

Application data (25°C)

• Mixing: single-pack.​

• Induction time: none.​

• Pot life: unlimited.​

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

• Thinner: APP dedicated thinner, 3–6%.​

• Recoat interval: min 6 h; max unlimited.​

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

• System: APP-81 primer + APP-61 topcoat; for enhanced protection, apply 1–2 plies of fiberglass cloth to reach total thickness ≥0.5 mm.​

Surface preparation
Steel: blast to Sa 2.5 or power-tool clean to St 3; surface profile 30–75 µm.​

System compatibility / packing / storage

• System compatibility: APP-81 primer + APP-61 topcoat.​

• Packing: primer 25 kg; topcoat 22 kg.​

• Storage: dry, cool, ventilated; away from fire; avoid strong sunlight; no outdoor storage.​

• Shelf life: 12 months.