Fumed Nano Silica Powder for Inorganic Fire-Resistant Adhesive

Curtain Wall Grade Nano Silica for Fire-Rated Glazing Manufacturer: ANDEHU NEW MATERIALS (SHANDONG) CO., LTD 1. Product Overview Engineered specifically for exterior fire-rated glass curtain wall systems, Andehu curtain wall grade Fumed SIlica / Nano SIlica is a high-performance interlayer material built on our standard product platform with upgraded weathering stability, structural bond strength and long-term optical reliability. It meets the stringent demands of high-rise and super high-rise building facades, fully complies with GB/T 15763.1 for Class A insulating fire-resistant glass, and delivers wind pressure resistance, UV durability and thermal cycling performance required for curtain wall engineering. Optimized for curtain wall fire glass fabrication, our R&D team has refined particle size distribution and surface modification to eliminate yellowing, delamination and cracking common with ordinary Fumed SIlica / Nano SIlica after long-term outdoor exposure, providing safe, durable fire protection for modern building facades. 2. Exclusive Curtain Wall Grade Performance Superior Weathering & Aging Resistance: Surface densification modification greatly improves UV resistance, water resistance and acid resistance of the cured gel. After 1000 hours QUV-B accelerated aging, transmittance loss ≤2%, with no yellowing, chalking or peeling. Designed for 25+ year outdoor service life, ideal for coastal and high-UV regions. High-Strength Structural Bonding: Bond strength between cured gel and glass substrate ≥2.5MPa, significantly above standard grades. Silanol groups form chemical bonds with glass surface and match glass thermal expansion coefficient. No stress cracking under -40℃ to 80℃ thermal cycling, ensuring curtain wall structural safety under extreme temperature swings. Large-Panel Pouring Compatibility: Optimized rheology and curing shrinkage ≤3% for large-format curtain wall glass. Enables bubble-free, flow-mark-free uniform pouring for panels over 2m×3m, improving production yield and supporting unitized curtain wall prefabrication. Dual Fire Integrity & Insulation: Beyond thermal insulation requirements, the product delivers enhanced fire integrity. In standard fire tests, unexposed surface temperature rise is uniform with no local hot spots. The gel layer maintains structure at high temperature without collapse or delamination, preventing flame and smoke spread and supporting curtain wall fire compartment design. 3. Curtain Wall System Fire Solutions Unitized Curtain Wall Fire Glass: Adapted to factory prefabrication of unitized systems, with adjustable curing speed to match assembly line takt time. Finished panels have high dimensional accuracy for direct on-site hoisting, accelerating installation. Framed Curtain Wall Fire Glass: Suitable for on-site glazing. The colloid exhibits good thixotropy and does not sag during vertical pouring. Cured material is compatible with frame sealing systems, causing no corrosion or swelling to aluminum profiles and sealants. Double Skin Facade Fire Barriers: Used as intermediate fire separation layers in double skin facades. Lightweight and transparent, it preserves ventilation and daylighting while blocking vertical fire spread within curtain wall cavities, complying with high-rise fire compartment codes. 4. Production Process Control Points Curtain wall grade products require stricter production environment and process control: 1.Substrate Pretreatment: Clean glass with pure water and plasma treat surface to ensure cleanliness and bond reliability. 2.Constant-Temperature Blending: Prepare formulation at 23±2℃, low-shear mixing with vacuum degassing to avoid air entrainment. 3.Cleanroom Pouring: Automated pouring equipment in Class 10,000 cleanroom to control flow rate and level for uniform thickness. 4.Three-Stage Curing: Step temperature curing to relieve internal stress and ensure flatness and optical quality of large panels. 5.Full Inspection: 100% inspection of appearance, transmittance, thickness deviation and stress before delivery. 5. Technical Specifications 表格 Item Curtain Wall Grade Index Test Standard Silica Content 45%–55% Gravimetric method Average Particle Size 90–110nm Dynamic light scattering pH Value (25℃) 9.5–10.2 pH meter Viscosity (25℃) 20–40mPa·s Rotational viscometer Visible Light Transmittance ≥90% GB/T 2680 Bonding Strength ≥2.5MPa Tensile bond test Fire Resistance Rating 1.0–3.0h GB/T 15763.1 UV Aging Resistance Transmittance loss ≤2% QUV-B 1000h Thermal Cycling No crack, no delamination -40℃~80℃, 50 cycles Curing Shrinkage ≤3% Volume change rate test 6. Engineering Advantages Complies with national building fire design codes, usable as Class A insulating fire separation components. High optical clarity preserves facade aesthetics and maintains curtain wall design consistency. Fully inorganic, Class A combustion rating: smoke-free, non-flammable, no toxic gas release. Compatible with major curtain wall sealants and structural adhesives, reducing integration risk. Tight batch-to-batch consistency supports large-scale supply and tight project schedules.