Ammonium polyphosphate

Description

1. Product Overview

Ammonium polyphosphate (APP) is a high-performance, inorganic flame retardant and intumescent additive, available in phase II (crystalline form) for superior thermal stability. It is primarily used in fire protection coatings, thermoplastics, thermosets, and engineering polymers to meet stringent fire safety standards (UL 94 V-0, EN 13501-1). The key value proposition is its ability to deliver durable, non-halogenated flame retardation with low smoke emission and excellent char formation. Strategically, APP is critical as global regulatory shifts toward environmentally persistent organic pollutants (POPs) and halogen-free systems accelerate demand for sustainable passive fire protection.

2. Key Specifications & Technical Characteristics

• Chemical composition: (NH₄PO₃)ₙ, n > 1000 (long-chain polymer, Form II crystal structure)

• Purity grade: ≥ 99.5% active content; industrial grade / high-polymerization grade

• Physical form: White, free-flowing fine powder

• Particle size (D50): 7–15 µm (standard); 3–5 µm (fine grade for thin-film coatings)

• Bulk density: 0.6–0.8 g/cm³ (tapped)

• Water solubility (25°C): < 0.5 g/100 mL (low solubility — critical for waterborne coatings)

• Thermal decomposition onset: ≥ 275°C (phase II, high thermal stability)

• pH (10% slurry): 5.5–7.0

• Packaging options: 25 kg laminated paper/PE bags, 500 kg big bags, 1,000 kg bulk FIBCs

• Shelf life: 24 months from date of manufacture when stored in dry, ambient conditions (below 40°C, RH < 70%)

3. Core Industrial Applications

• Intumescent coatings (passive fire protection): Used in structural steel, timber, and cable trays. APP chars into a stable, swollen foam layer at >250°C, insulating substrates for up to 120+ minutes — outperforming expandable graphite in adhesion and aging resistance.

• Engineering thermoplastics (PP, PE, ABS, PA6): At 20–25 wt% loading with synergists (e.g., pentaerythritol, melamine), achieves UL 94 V-0 at 1.6 mm. Superior to brominated flame retardants in smoke density and corrosion resistance.

• Polyurethane foams (rigid & flexible): APP reduces melt dripping and suppresses afterglow, critical for mattress, automotive, and insulation panels — more cost-effective than aluminum trihydrate at equivalent fire load.

• Epoxy & unsaturated polyester resins (circuit boards, composites): APP maintains dielectric strength while enabling halogen-free compliance for electronics and EV battery housings.

4. Competitive Advantages

• Quality consistency: Lot-to-lot variance <2% in particle size and solubility; certified via ISO 17025 lab testing (ICP, TGA, laser diffraction). Each COA includes moisture, pH, phosphorus content (31–32% P₂O₅ equivalent), and nitrogen (14–15%).

• Supply reliability: Dual-sourced raw material streams; 5,000 MT/month global production capacity with safety stock buffer.

• Logistics capability: Strategically located warehousing in Rotterdam, Houston, Shanghai, and Jebel Ali — lead times 7–14 days for key markets.

• Price competitiveness: Volume-based tiered pricing with 3-year fixed-rate contracts available for ≥500 MT/year buyers.

• Sustainability: Non-halogenated, REACH-compliant, RoHS-ready; low ecotoxicity (LC50 > 100 mg/L for aquatic organisms). Supports green building certifications (LEED, BREEAM).

• Technical support: In-house fire testing lab (cone calorimeter, UL94, 20-min furnace) and formulation advisory provided at no cost for qualified buyers.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 20 MT per product grade (mixed containers accepted)

• Loading capacity:

  • 20 ft container: 20 MT (palletized, 25 kg bags)

  • 40 ft container: 25 MT (FIBC or bulk bags)

• Incoterms available: EXW, FOB, CIF, DDP (upon credit approval)

• Payment terms: Letter of credit (L/C at sight) or wire transfer; net 30 days for established accounts with credit line