colloidal silica for fire glass

Silica Sol for Fire Resistant Glass Manufacturer: Shandong Zhonglian Chemical Co., Ltd. 1. Product Overview Silica sol for fire resistant glass is a stable aqueous dispersion of nano-silica, and the most widely used core raw material for grouted fire glass. Leveraging technical accumulation in silicon materials, Shandong Zhonglian Chemical produces a full range of silica sol products with varying particle sizes and concentrations via a combined ion exchange and silicon powder dissolution process, fully adapting to diverse production needs in the fire glass industry. Compared with traditional water glass (sodium silicate) systems, silica sol based fire glass offers significant advantages including no alkali efflorescence, high transparency, excellent weather resistance and stable fire performance, and has become the standard configuration for medium and high-end fire glass products. The product can be customized to match customer formulas and process characteristics, helping enterprises improve product quality and reduce overall production costs. 2. Product Classification and Characteristics 2.1 By Particle Size Small particle size silica sol (10~30nm): Large specific surface area, high reactivity and fast curing, suitable for thin fast-curing fire glass with high production efficiency Medium particle size silica sol (40~80nm): Balanced overall performance, good storage stability and strong versatility, the mainstream choice for 1.0~1.5h fire resistance rating Large particle size silica sol (90~120nm): High post-curing density, excellent thermal shock resistance and structural strength, suitable for products with fire resistance rating above 2.0h 2.2 By Solid Content Regular grade (30%~40%): High cost performance and transportation economy, suitable for long-distance distribution and large inventory, ideal for small and medium-sized fire glass manufacturers High concentration grade (45%~55%): High solid content, low curing shrinkage and excellent fire resistance, suitable for high-end fire glass and high fire resistance rating production 2.3 By Modification Type General alkaline type: pH 9.0~10.5, good storage stability, compatible with most fire glass formulas with strong versatility Surface modified type: Modified with silane coupling agent, offering higher bonding strength and better water resistance, suitable for high weather resistance requirements and outdoor applications 3. Fire Protection Mechanism Silica sol provides multi-layer protection in fire glass, building a fire barrier through physical and chemical changes: 1.Endothermic Cooling: Water evaporation absorbs large amounts of latent heat, effectively delaying temperature rise on the unexposed surface and buying time for evacuation 2.Thermal Insulation Barrier: The cured silica gel layer has extremely low thermal conductivity, acting as an excellent thermal insulator and greatly reducing heat transfer efficiency 3.Structural Support: The ceramized layer formed at high temperature has certain mechanical strength, supporting the glass against collapse and maintaining fire separation integrity 4.Smoke Suppression & Non-toxicity: All-inorganic composition generates no smoke or toxic gas during combustion, ensuring personnel safety during fire evacuation Experimental data shows that 12mm thick fire glass made with premium silica sol has an average unexposed surface temperature rise 10~15℃ lower than traditional water glass systems in 800℃ fire resistance tests, with significantly improved fire stability and service life. 4. Production and Application Process Typical Process Flow of Pouring Type Fire Glass 1.Fire Resistant Liquid Preparation: Weigh silica sol, curing agent (KOH/NaOH solution), defoamer and additives according to formula, mix uniformly at low speed in a stirring tank 2.Vacuum Degassing: Place the prepared liquid in a vacuum degassing tank, degas at -0.09MPa for 1~2 hours until no obvious bubbles rise 3.Glass Assembly: Form a cavity between two clean dry glass substrates with sealing strips, reserving pouring and exhaust ports 4.Pressure Pouring: Inject the fire resistant liquid into the cavity by pressure pouring, seal the port after filling to ensure no residual bubbles 5.Curing Molding: Send to curing kiln for gradient curing according to set temperature curve, total process takes about 12~24 hours 6.Post-treatment: Edge trimming, cleaning, inspection and packaging after curing 5. Quality Control Indicators 表格 Test Item Standard Requirement Test Method Silica Mass Fraction Nominal value ±0.5% GB/T 11446 Sodium Oxide Content ≤0.3% Flame photometry Average Particle Size Nominal value ±10nm Laser particle size analyzer pH Value (25℃) 9.0~10.5 GB/T 27974 Viscosity (25℃) ≤50mPa·s Rotational viscometer Density (25℃) 1.2~1.4g/cm³ Pycnometer method Appearance Colorless transparent liquid, no mechanical impurities Visual inspection 6. Industry Application Value and Selection Guide Application Value Quality Upgrade: Fundamentally solves the chronic problem of alkali efflorescence and whitening in water glass systems, significantly improving optical performance and weather resistance Extended Service Life: Weather resistance is 3~5 times that of traditional water glass systems, greatly reducing after-sales maintenance costs and extending service life of building fire components Wider Fire Resistance Range: Stably achieves 3.0h high fire resistance rating, meeting the design requirements of special buildings and high-risk places Eco-friendly Production: No three wastes discharge in production, product meets green building material evaluation standards, supporting enterprises' green transformation Selection Guide 0.5~1.0h standard fire doors/windows: 30% solid content medium particle size silica sol for optimal economy and mass production 1.5h fire partitions and fire doors: 40% solid content medium particle size silica sol for balanced performance and cost, maximum versatility 2.0~3.0h high-grade fire glass: 50%+ high solid content large particle size silica sol for guaranteed fire resistance and structural strength Export products: Low-sodium high-purity silica sol to meet international standards and certifications (EU, North America, etc.) Storage and Usage Notes Store at 5~35℃, avoid direct sunlight and freezing, do not mix with acidic substances Stir well before use. Slight precipitation after long-term storage does not affect performance after stirring Use promptly after opening. Remaining product must be stored sealed to prevent water evaporation and contamination Address: Huaiyin District, Jinan City, Shandong Province, China