Waste Interlayer Silica Recovery Methods for Fire Glass

Fumed Silica （Nano Silica） for Fire Glass – Process-Optimized Grade Manufacturer: ANDEHU NEW MATERIALS (SHANDONG) CO., LTD 1. Product Overview Andehu process-optimized Fumed Silica （Nano Silica） is developed specifically for fire glass manufacturers, with formulation tailored to match common domestic and imported pouring production lines. The product is designed to minimize process adjustments, reduce defect rates and improve line efficiency, while delivering stable Class A fire insulation performance. Our technical team provides on-site process matching support including formulation adjustment, curing profile optimization and troubleshooting, helping fire glass factories quickly adopt Fumed Silica （Nano Silica） technology to replace traditional water glass systems. 2. Process-Friendly Design Features Low-foaming formulation: Low surface tension and controlled release of dissolved air reduce bubble entrainment during mixing and pouring, decreasing vacuum degassing time by up to 30%. Adjustable curing speed: Curing rate can be tuned via curing agent dosage to match fast automated lines or slow large-panel pouring, avoiding premature gelation or over-long cycle times. Self-leveling rheology: Optimized viscosity and thixotropy enable uniform flow in glass cavities, eliminating flow marks and thickness variation especially for large-format panels. Low curing shrinkage: Volume shrinkage ≤3% for standard grades, reducing edge stress and cracking risk during curing and cooling. Broad process window: Tolerates ±5℃ temperature variation and ±10% mixing ratio deviation, suitable for production environments with limited climate control. 3. Recommended Process Flows 3.1 Vacuum Pouring Line (most widely used) 1.Raw material preheating: Fumed Silica （Nano Silica） tempered to 23±2℃ 2.Blending: add curing agent and additives under low-shear stirring 3.Vacuum degassing: -0.095MPa for 30–45min until no visible bubbles 4.Filling: gravity or low-pressure pouring into sealed glass cavity 5.Curing oven: gradient temperature program 60℃→80℃→100℃ 6.Post-processing: edge trimming, inspection, packaging 3.2 Lamination Coating Line 1.Paste preparation: Fumed Silica （Nano Silica） + thickener mixed to 5,000–20,000mPa·s 2.Coating: knife or roll coating onto first glass sheet 3.Pre-gelling: 60℃ oven to remove partial water 4.Lamination: second glass sheet pressed under roller press 5.Final curing: 80–100℃ oven for full crosslinking 4. Typical Technical Data 表格 Parameter Standard Grade High-Solid Grade SiO₂ Content 40% 50% Particle Size 80–100nm 100–120nm pH 9.0–10.0 9.5–10.5 Viscosity @25℃ 15–30mPa·s 30–50mPa·s Light Transmittance ≥88% ≥87% Recommended Interlayer 8–12mm 15–20mm Typical Fire Rating 1.0–1.5h 2.0–3.0h 5. Technical Support for Production Formulation optimization for existing production lines Curing profile development by glass thickness and fire rating Defect analysis and solution for bubbles, streaks, cracking, efflorescence Worker training and SOP development Pilot batch testing before mass adoption 6. Packaging & Storage 25kg, 200kg drums and 1000kg IBC totes. Store at 5–35℃ in original sealed containers. Shelf life 12 months. Address: Huaiyin District, Jinan City, Shandong Province, China