What is the difference between calcined and fused alumina for polishing?

Fused alumina (white or pink) is made by melting calcined alumina. It has higher hardness and sharper edges, used for rough polishing. Calcined alumina has rounded particles, used for final polishing where surface quality matters.

Can I reuse polishing alumina slurry?

Yes, with proper filtration and pH control. Most precision polishing shops recycle slurry 5 to 10 times before disposal. We can advise on recycling protocols for your specific application.

What mesh size for plastic lens polishing?

Plastic (acrylic, polycarbonate) is softer than glass. Use 0.3 to 1 micrometer alumina to avoid scratching. For very soft plastics, consider colloidal silica instead.

Is your alumina slurry ready-to-use or concentrate?

Both. We ship ready-to-use slurry at 1 to 5% concentration in 25 L drums, and concentrate slurry at 30 to 50% in 200 L drums for dilution at the customer site.

What is the price for polishing-grade alumina?

$3 to $8 per kg depending on grade and purity. Sub-micron grades are 3 to 5x more expensive than coarse grades due to more complex manufacturing.

Aluminaworld

15+ Years ManufacturerISO 9001Exported to 60+ CountriesMOQ 100 kgLead Time 15-25 DaysFree Sample

ALUMINA POWDER Application Guide 2026-06-08. 7 min read

Alumina Powder for Precision Polishing: Sapphire, Wafer, and Lens Finishing

alumina polishing compound - application guide from Aluminaworld. ISO 9001 certified manufacturer with 15+ years export experience. Free sample available.

✓ ISO 9001 Certified ✓ 60+ Countries Served ✓ Free 1 kg Sample