Fumed Silica for In-Line Infusion Fire-Resistant Glass Process

Fumed Silica for Fire-Resistant Glass – Technical Data Sheet Manufacturer: ANDEHU NEW MATERIALS (SHANDONG) CO., LTD 1. Product Description Andehu colloidal silica for fire-resistant glass is an aqueous dispersion of high-purity amorphous nano-sized silica particles, designed as the core interlayer material for cast-in-place Class A insulating fire glass. The product is manufactured via controlled silicate hydrolysis and surface modification, delivering stable colloidal properties, consistent particle size distribution and reliable fire insulation performance. It is formulated to replace traditional sodium silicate systems, reducing efflorescence and improving long-term optical stability. 2. Key Characteristics 1.Chemical Purity: SiO₂ (dry basis) ≥99.8%; Na₂O ≤0.3%; heavy metals below detection limits; no organic additives. Non-toxic and non-combustible, compliant with inorganic fire protection material requirements. 2.Particle Size Control: Monodisperse spherical particles with nominal diameters of 60nm, 80nm, 100nm and 120nm available. Narrow particle size distribution (PDI <0.15) ensures uniform curing and consistent optical properties. 3.Optical Properties: Refractive index 1.38–1.40 at 25℃; visible light transmittance ≥88% for 10mm path length. Cured gel layer exhibits refractive index matching to soda-lime glass, minimizing light scattering. 4.Colloidal Stability: Stabilized by surface charge in alkaline aqueous medium. No gelation, sedimentation or phase separation after 12 months of storage under recommended conditions. 3. Fire Reaction Mechanism Upon exposure to fire, the material undergoes three sequential thermal stages: 1.Dehydration stage (25–200℃): Evaporation of free and bound water, endothermic process. 2.Polycondensation stage (200–600℃): Formation of siloxane bonds, development of three-dimensional network structure, volume shrinkage and densification. 3.Ceramization stage (>800℃): Sintering of silica nanoparticles into a continuous vitreous ceramic layer with low thermal conductivity and high structural integrity. 4. Recommended Processing Conditions Pouring process: Mixing temperature: 20–25℃ Degassing: vacuum ≥ -0.09MPa, 30–60min Curing profile: 60℃ / 4h → 80℃ / 6h → 100℃ / 4h Interlayer thickness: 5–20mm Lamination process: Thickener addition: 0.5–2.0% by weight Coating thickness: 2–8mm wet film Lamination pressure: 0.3–0.8MPa 5. Typical Properties 表格 Property Specification Test Method SiO₂ Content 30–55 wt% Gravimetric (105℃/2h + 1000℃/1h) Mean Particle Size 60–120 nm Dynamic Light Scattering pH @ 25℃ 9.0–10.5 Glass electrode pH meter Viscosity @ 25℃ 10–50 mPa·s Rotational viscometer, 60rpm Light Transmittance ≥88% Spectrophotometer, 550nm, 10mm cell Na₂O Content ≤0.3 wt% Flame photometry Shelf Life ≥12 months Sealed storage 5–35℃ 6. Applications & Grade Selection 表格 Fire Rating Recommended Grade Typical Use 0.5–1.0 h 30–40% solids, 60–80nm Interior fire doors, windows 1.5–2.0 h 40–50% solids, 80–100nm Fire partitions, compartment walls 2.5–3.0 h 50–55% solids, 100–120nm High-rise curtain walls, escape routes Packaging & Handling Available in 25kg, 200kg HDPE drums and 1000kg IBC totes. Store in original sealed containers at 5–35℃, protected from direct sun and frost. Address: Huaiyin District, Jinan City, Shandong Province, China