GT-NSP-Fp2.00 Indoor 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 functional additives.​
When exposed to fire, the coating intumesces and forms a carbonized fire-resistant thermal insulation layer to delay steel temperature rise 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 functional additives (waterborne system).​

Typical uses

• Fire protection for indoor steel structures and building steel space frames (grid structures).​

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 → DFT → theoretical consumption): 2 h → ≥3.3 mm → 4.6 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): initial drying crack resistance: no cracks; bond strength: 0.82 MPa; heat/cold cycling (15 cycles): no cracking/flaking/blistering, insulation efficiency attenuation 4%; water resistance (24 h): no delamination/blistering/peeling, insulation efficiency attenuation 9%; fire test: measured thickness 3.3 mm, steel beam span 5400 mm, test time 123 min (124 min stated during test), max deflection 41.52 mm, average temperature 539.96°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/brush).​

• 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 ≥24 h.​

• Curing/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 surface 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

• Optional dedicated topcoat (tintable) can be applied for protection and decoration after the fireproof coating reaches thickness and is hard dry; 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.