GT-WSP-Fp2.00 Outdoor Intumescent Fireproof Coating for Steel Structure

Overview
Waterborne fireproof coating for steel structures based on special waterborne elastic resin emulsion, flame retardants, blowing agent, and additives.​
When exposed to fire, the coating intumesces to form a carbonized fire-resistant thermal insulation layer to delay steel heating and improve fire resistance time.​
The document states the product performance meets or exceeds GB 14907-2018 (Steel Structure Fireproof Coatings).​

Composition
Special waterborne elastic resin emulsion, high-efficiency flame retardant, blowing agent, and additives (waterborne system).​

Typical uses

• Fire protection for steel structures and building steel space frames (document describes broad application; product name specifies outdoor use).​

Technical data (typical)

• Color: Gray.​

• Gloss: Matt (no gloss).​

• Density / specific gravity: 1.24 kg/L.​

• Shelf life: 12 months.​

• Packaging: 20 kg/pail or 50 kg/pail.​

• Coating theoretical (fire resistance requirement → thickness → theoretical consumption): 2 h → ≥3.2 mm → 4.5 kg/m²; 1.5 h → ≥2.6 mm → 3.2 kg/m²; 1 h → ≥1.7 mm → 2.2 kg/m².​

• Key test results (as listed): bond strength 0.77 MPa; heat resistance 720 h attenuation 7%; damp heat 504 h attenuation 6%; freeze-thaw 15 cycles attenuation 2%; acid resistance 360 h attenuation 4%; alkali resistance 360 h attenuation 2%; salt spray (30 cycles) attenuation 5%; UV radiation (60 cycles) attenuation 4%; fire test: thickness 3.2 mm, steel beam span 5400 mm, 120 min test time, max deflection 28.44 mm, average temperature 518.96°C.​

Application data (25°C)

• Mixing: Single-pack.​

• Induction time: None.​

• Pot life: Unlimited (as stated).​

• Application methods: Air spray, roller (brush also listed under application mode table).​

• Thinner: Water.​

• Maximum dilution: 5% (air spray); 5% (roller).​

• Air spray nozzle diameter: 4.0–6.0 mm.​

• Air spray pressure: 0.6–0.8 MPa.​

• Application notes (thickness control): first coat ≤0.5 mm; subsequent coats ≤0.8 mm; interval between coats not less than 24 h.​

• Coating conditioning for testing (as stated): physico-chemical performance testing conditioning 30 days at 5–35°C; fire performance testing conditioning 50 days at 5–35°C.​

Surface preparation

• Prior to blasting: grind welds, welding spatter, burrs, and chamfer sharp edges.​

• Blast cleaning to Sa 2.5 or power-tool cleaning to St 3; steel must be bare and free of mill scale/oxide scale.​

• Apply coating within 5 h after surface preparation (as stated).​

• Apply at least two coats of anti-corrosion primer first; apply fireproof coating after the anti-corrosion primer is dry.​

System compatibility / packing / storage

• After achieving thickness and hard dry, a dedicated topcoat (tintable) may be applied for protection and decoration; the fireproof coating itself is stated as not tintable.​

• Storage: sealed storage in a ventilated, dry place without direct sunlight; storage temperature 5–35°C (as stated).​

• Shelf life: 12 months.