Name: Aluminum Oxide (White Corundum) Extender
Brand: Coatingsink
SKU: aluminum-oxide-corundum-extender
Availability: InStock

Question 1

Why is aluminum oxide preferred over silica sand for anti-slip coatings?

Accepted Answer

White corundum (α-Al2O3) has a Mohs hardness of 9.0 versus 7.0 for quartz, making it significantly more wear-resistant under foot traffic or vehicle tyres. Its angular particle morphology creates effective mechanical grip while resisting wear-down over the coating's service life. Unlike silica sand, corundum also contains no crystalline silica, avoiding respirable silica exposure concerns during application. For high-traffic industrial floors, marine walkways, and ramp surfaces, corundum delivers measurably longer anti-slip durability than silica alternatives.

Question 2

What particle size grade should be selected for floor coating versus deck coating applications?

Accepted Answer

For thin-film floor coatings (DFT 100–300 µm), a fine grade with d50 of 5–10 µm is incorporated into the base coat for matrix reinforcement, while a coarser broadcast grade (d50 50–150 µm) is scattered onto the wet top coat to achieve tactile grip. For thick marine deck coatings or concrete primers, a medium grade (d50 15–25 µm) mixed into the formulation at 10–20% loading provides both structural hardness and surface texture without excessively increasing coating viscosity.

Density	3.9–4.0 g/cm³
Al2O3 Content	≥99.5%
Mohs Hardness	9.0
Oil Absorption	20–30 g/100g
Particle Size (d50)	5–20 µm

Aluminum Oxide (White Corundum) Extender

Specifications

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