Hollow glass microspheres 20-micron for color steel tile insulation paint
20-micron hollow glass microspheres are the core insulation medium in corrugated steel roofing tile insulation paint. Relying on their hollow, closed structure, they achieve dual insulation through “reflection + barrier.” Silane modification significantly improves their dispersion, adhesion, and water and weather resistance in the paint.
I. Core Parameters of 20μm Hollow Glass Microspheres (Compatible with Corrugated Steel Roofing Tile Paint)
Composition: Soda-lime glass, fused process, white hollow spheres.
Particle Size: D50 = 20μm (D90 ≈ 30μm), wall thickness 1–2μm.
Density: True density 0.4–0.6 g/cm³, bulk density 0.2–0.3 g/cm³ (far lower than conventional fillers).
Thermal Conductivity: 0.038–0.060 W/(m·K) (close to still air, the core of insulation). Pressure resistance: 3.5–5MPa; Temperature resistance: -60℃ to 650℃; Non-flammable and resistant to acids and alkalis.
II. Thermal Insulation Principle (Color Steel Tile Scenario)
Hollow Cavity Thermal Insulation: The interior seals in still air, blocking heat conduction, equivalent to a “micron-level insulation layer.”
Multi-Interface Reflection: 20μm microspheres form dense reflective interfaces in the coating, reflecting 85%+ of solar infrared/visible light, reducing heat absorption on the tile surface (surface temperature reduction of 10–12℃, indoor temperature reduction of 5–8℃).
Thin-Layer High-Efficiency Thermal Insulation: A dry film of 70–100μm achieves the effect of traditional insulation boards without increasing load or causing water accumulation.
