White Fused Alumina Application in Floor Coatings
White Fused Alumina (WFA, high‑purity fused α‑Al₂O₃, Mohs hardness 9.0) serves as a high‑end wear‑resistant aggregate and functional filler for epoxy, polyurethane and polyurea floor coatings. Featuring light‑colored cleanliness, heavy‑duty abrasion resistance, anti‑slip property and chemical resistance, it is an irreplaceable premium raw material compared with quartz sand and brown fused alumina.
Core Functions in Floor Coatings
- Form rigid wear‑resistant framework to greatly extend service life Angular particles embed into the paint film to withstand friction from forklifts, trolleys and heavy loads. The pencil hardness of coating rises from ordinary 2H to 3‑4H, and abrasion‑resistant lifespan increases by 30%‑200%, reducing powdering, scratches and substrate exposure. Unlike quartz sand (Mohs 7), its grains are hardly rounded after long‑term friction for lasting wear resistance.
- Pure‑white without yellowing for clean light‑colored flooring With Fe₂O₃ ≤0.08% (preferably ≤0.05%), ultra‑low iron content delivers pure‑white powder. It will not turn yellow or generate rust spots in white, light‑grey or tinted floor systems, making it ideal for GMP food, pharmaceutical and electronic clean workshops for easy dirt inspection. Brown fused alumina with high iron content is forbidden for light‑colored flooring.
- Chemical resistance and enhanced compact barrier performance Chemically inert against acids, alkalis, oil stains, disinfectants and solvents. It fills micro‑pores in paint films to improve salt‑spray resistance and impermeability, preferred for laboratories and chemical workshops. Angular grains form mechanical anchoring with resin to boost coating adhesion and lower delamination risks.
- Adjustable anti‑slip performance Coarse particles deliver high anti‑slip performance for ramps; fine powder creates subtle matte anti‑slip effect balancing aesthetics and anti‑slip coefficient.
- Good insulation property Applicable for anti‑static clean floor systems.
Applicable Floor Systems & Application Scenarios
‑ Epoxy self‑leveling & thin‑coat wear‑resistant topcoat: electronic workshops, pharmaceutical GMP workshops, food‑processing clean workshops ‑ Epoxy mortar flooring: heavy‑duty workshops, warehouses, auto‑repair workshops ‑ Epoxy color‑sand flooring: decorative colored flooring ‑ Polyurethane / polyurea flooring: shopping malls, cold storage, outdoor heavy‑duty floors ‑ Light‑colored anti‑slip ramps & parking lot anti‑slip flooring ‑ Anti‑static clean flooring & laboratory anti‑corrosion flooring
Recommended Grit Size & Dosage for Floor Coatings
表格
| Floor System | Suggested Grit | Addition Ratio | Functional Features |
|---|---|---|---|
| Anti‑slip ramp topcoat, heavy‑duty anti‑slip layer | 60#‑120# | 20‑30% | High anti‑slip performance, R11~R13 slip resistance class |
| Epoxy mortar, intermediate wear‑resistant layer | 120#‑180# | 25‑40% | Compressive and wear‑resistant, used as mortar aggregate |
| Wear‑resistant topcoat for clean workshops, color‑sand flooring | 180#‑320# | 12‑20% | Delicate matte finish, wear‑resistant & color‑stable, compatible with levelling |
| High‑gloss self‑leveling topcoat | 400#‑800# | 5‑12% | Fine powder, retain gloss and enhance scratch resistance |
Process Tip: Silane coupling agent surface‑modified powder can reduce oil absorption value, improve dispersion in epoxy / PU resin, and mitigate viscosity rise and sedimentation of coatings.
Key Technical Specifications for Floor‑Coating‑Grade White Fused Alumina
| Item | Specification |
|---|---|
| Al₂O₃ | ≥99.0%; ≥99.5% for high‑end clean‑room flooring |
| Fe₂O₃ | ≤0.08%; ≤0.05% preferred for clean workshops |
| SiO₂ | ≤0.20% |
| Na₂O | ≤0.30% (control alkali content to avoid interfering resin curing) |
| Mohs Hardness | 9.0 |
| True Density | 3.90‑4.00 g/cm³ |