What coating film can white fused alumina be as filler
White fused alumina’s main component is high-purity α-Al₂O₃. It boasts high whiteness, few impurities, extremely low iron content, high hardness, chemical stability, and superior insulation compared to brown fused alumina. It is suitable for various light-colored, white, colored, high-gloss, insulating, and precision wear-resistant coatings. It can be categorized by application as follows:
I. Light-colored/White High-Gloss Wear-Resistant Industrial Paints
1. White Epoxy Topcoat, Light-colored Epoxy Anti-corrosion Paint
Ordinary brown fused alumina will cause white paint to turn yellow and gray, while white fused alumina is pure white and unaffected by color mixing. Commonly used for anti-corrosion topcoats on white equipment, white storage tanks, food-grade equipment, and pharmaceutical equipment. Adding white fused alumina micro-powder: wear-resistant and scratch-resistant, while ensuring a pure white paint surface, stable gloss, and no discoloration.
2. Polyurethane White Topcoat, Two-component PU Colored Topcoat
White shells of mechanical equipment, painting production line equipment, medical devices, and water purification equipment. It combines abrasion resistance and chemical resistance; red, yellow, blue, and light gray colored paint surfaces will not be stained by fillers.
3. Acrylic Industrial Topcoat
Outdoor fans, aluminum alloy equipment, and precision instrument shells. UV resistant and does not yellow; the filler itself is weather-resistant and stable; the paint surface is scratch-resistant.
II. Various Floor Coating Films
1. White/Light Gray Epoxy Self-Leveling and Thin-Coat Epoxy Flooring
Suitable for electronics workshops, laboratories, pharmaceutical factories, food processing plants, and cleanrooms, where light colors facilitate easy inspection of dirt. White fused alumina micropowder enhances the floor’s wear resistance and resistance to trolley dragging, leaving a clean white surface, distinct from dark brown fused alumina flooring.
2. Colored Sand Epoxy Flooring and Colored Artistic Flooring
Flooring in various colors such as red, yellow, blue, and green, using white fused alumina as a wear-resistant filler, resulting in bright and non-dulling colors.
3. Polyurethane and Polyurea Light-Colored Floor Topcoats
Suitable for shopping malls, laboratories, and cleanrooms, offering wear resistance and color retention, preventing darkening or yellowing over long-term use.
4. Light-Colored Anti-Slip Ramp Paint and Anti-Slip Line Marking Paint
Light-colored anti-slip pavement, using fine white fused alumina particles for anti-slip and wear resistance, with a clean color.
III. Food, Pharmaceutical, and Drinking Water Contact Grade Anti-corrosion Coating Film
White fused alumina has extremely low heavy metal content, no free iron, is non-toxic, and resistant to acids and alkalis, meeting hygiene requirements:
1. Epoxy anti-corrosion coating for the inner walls of drinking water pipelines;
2. Anti-corrosion and wear-resistant paint for the inner walls of food mixing tanks, fermentation tanks, and sauce storage tanks;
3. Protective coating for the inner walls of pharmaceutical reaction vessels and purification equipment. Limitation: Brown fused alumina contains iron, which easily leaches and contaminates materials; only white fused alumina can be used in these applications.
IV. Insulating and Wear-Resistant Coatings
White fused alumina offers excellent insulation and high resistivity, combining wear resistance and insulation. Green silicon carbide is more expensive, so many mid-range insulating coatings use white fused alumina:
1. Insulating and wear-resistant topcoat for motor and generator housings;
2. Insulating and protective paint for high and low voltage switchgear and busbar equipment;
3. Auxiliary insulating protective coating for transformers;
4. Insulating primer for anti-static flooring in electronic factories.
V. Specialized Coatings for Precision Equipment, Aluminum Alloys, and Light Metals
Aluminum alloys, magnesium alloys, precision machine tools, CNC equipment, and automated tooling:
1. Aluminum alloy epoxy primer + light-colored wear-resistant topcoat, white corundum wear-resistant, preventing iron impurities from causing electrochemical corrosion on the aluminum surface;
2. Topcoat for robot equipment and automated production lines, resistant to friction and scratches from robotic arms, resulting in a clean and aesthetically pleasing finish;
3. Protective coating for small aerospace parts and precision instruments, low impurities, no risk of rust.
VI. High-End Wear-Resistant Coatings for Wood and Plastics
1. Solid Wood Wear-Resistant Clear Varnish, White Wood Paint
High-end white topcoat and matte wear-resistant clear varnish for wooden doors, cabinets, and panel furniture. The addition of ultra-fine white corundum powder enhances the paint film’s resistance to nail scratches, wear, and impacts, unlike brown corundum which can cause a brownish or rough finish.
2. Plastic Shell PU Paint, ABS/PC Plastic Topcoat
Light-colored, pearlescent plastic paint for appliance shells, power banks, and instrument casings. The addition of white corundum improves wear resistance and scratch resistance without affecting color matching.
VII. Special Abrasion-Resistant Coatings for Printing, Leather, and Paper Products
1. Abrasion-resistant varnish and protective coating for paper
Abrasion-resistant coating for book covers and color boxes, resistant to friction and ink fading, maintaining the texture of light-colored printing;
2. Abrasion-resistant polyurethane coating for artificial leather surfaces
White and light-colored leather, resistant to daily wear and tear, and does not discolor.
Ⅷ. High-gloss wear-resistant protective paint for molds and tooling
Short-term protective high-gloss paint for injection molds and die-casting molds: Ultra-fine white corundum micro powder, dense and wear-resistant paint film, smooth polishing, without dark brown corundum particles causing black spots or scratches on the paint surface.
Ⅸ. Powder coating (electrostatic powder spraying)
Outdoor white powder coating, color electrostatic powder coating (epoxy powder, polyester powder): White corundum ultrafine powder is used as a wear-resistant filler to improve the powder coating’s resistance to sand and stone impact and scratch resistance; the outdoor weather-resistant version will not turn yellow and is widely used in street lamps, aluminum alloy guardrails, and home appliances.
Ⅹ. Light-colored anti-corrosion coatings for ships and marine applications
1. White hull paint for yachts, light-colored paint for ship superstructures;
2. Light-colored anti-corrosion and wear-resistant paint for seawater desalination equipment and seawater pipelines. Advantages: Extremely low iron content, less prone to rust in seawater environments; light color and aesthetically pleasing, combining salt spray resistance and wear resistance.
XI. Supporting Components: Pearl/Color-Changing Coating Auxiliary Fillers
While primarily composed of flat alumina, many affordable pearlescent paints are blended with ultra-fine white corundum: this finely adjusts the skin feel, increases wear resistance, does not interfere with the pearlescent color, and is suitable for cosmetic-grade packaging paints and nail polish.