I get many enquires for alumina (Aluminium oxide) but there are a huge variety of grades varying from R172/kg to R325/kg plus VAT.
Some varieties are:
FUSED ALUMINAS; they have been melted at 2000°C. They are solid and impervious.
Brown fused alumina: Brown, made from bauxite.
White fused alumina: clear to white.
Fused chrome alumina: Dark ruby and emerald.
Pink fused alumina: contains a small amount of chrome oxide.
Heat treated brown fused alumina: Blue grey
Tabular aluminas: R53/kg + VAT. 99,5% pure, white, mainly used in refractories. bright white, mainly used in Slight porosity makes it bright white.
Polishing alumina : R75/kg + VAT has zero% coarse particles.
Catalyst alumina: Highly porous particles, as balls, “vermicelli” or powder. New or used.
Pressing alumina: spray dried powder for making abrasion resistant tiles. Very fine -5 micron.
Cell grade alumina: Raw material for aluminium manufacture. From R10/kg for contaminated.
Volatilised alumina: sub micron particles from boiled alumina.
Splinter alumina: crushed wear resistant tiles.
Dross: the waste from aluminium production. Contains metal, nitrates and many impurities. Porous.
Grindings: Waste from abrasion manufacture.
Grog: Crushed refractory bricks
Balls: a wide variety of sizes and qualities.
Alumina fibre: High temperature insulation.
Bubble alumina: Hollow alumina balls.
Keraline: Woven alumina textile
Keratab: Powders: add water and pour into moulds to make refractory shapes.
Slip: Powder. Add water and pour into Plaster of Paris moulds. Fire to 1250°C to get hard shapes.
We stock all of these in small quantities.
Most of these come in a wide range of sizes. The main property is hardness, 9 on the Moh scale, just below diamond at 10. We also stock silicon carbide, 9,5 on the Moh scale in 42 different sizes.