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| Synonyms:Dialuminum trioxide Aluminium trioxide Aluminum(III) oxide Molecular Formula:Al2O3 Molecular Weight: 101.96 HS Code: 2818200000 Grade:Superfine Alumina（0.3-0.9um) Calcined alumina High purity alumina Dispersed alumina Low sodium alumina Gamma alumina Ceramic alumina Nano-alumina activated alumina AO-G，AO-1，AO-2 Hazard Class:General Cargo | |||||||||
1344-28-1
boss chem
1344-28-1
Aluminum oxide (Al₂O₃, alumina) is a white, chemically stable crystalline oxide with a melting point of 2072 °C and extreme hardness.
Outside the smelter, alumina's hardness, thermal stability, electrical insulation and high surface area in activated forms make it the backbone of refractories, technical ceramics, abrasives, polishing media, catalyst supports and desiccants. From furnace linings to grinding wheels, spark-plug insulators and lithium-battery separators, one oxide serves an extraordinary range of engineering materials.
A single oxide, four core value propositions:
Aluminium Smelting:
● the feedstock of primary aluminum production in Hall–Héroult reduction cells;
Refractories & Ceramics:
● a high-temperature refractory and technical-ceramic material for furnaces, insulators and structural parts;
Abrasives & Polishing:
● corundum-based abrasives and polishing media for grinding, cutting and finishing;
Catalysts, Adsorbents & Specialty:
● a high-surface-area catalyst support, desiccant and specialty filler for chemicals and batteries.
Item | Specification |
Chemical Name | Aluminium oxide (Alumina) |
Synonyms | Alumina; Corundum (α-form); Aluminum trioxide; Al₂O₃ |
CAS No. | 1344-28-1 |
EC No. (EINECS) | 215-691-6 |
Molecular Formula | Al₂O₃ |
Molecular Weight | 101.96 g/mol |
HS Code | 2818.20 (aluminium oxide, other than artificial corundum; 8-digit code may vary by destination) |
Appearance | White crystalline powder |
Density | 3.95 – 4.10 g/cm³ (α-Al₂O₃) |
Melting Point | 2072 °C |
Boiling Point | 2977 °C |
Alumina exists in several crystalline phases. α-Al₂O₃ (corundum) is the thermodynamically stable high-temperature form — dense, extremely hard and chemically inert, used for abrasives, refractories and ceramics.
● Extreme thermal stability: melts at 2072 °C and survives furnace service where most materials fail.
● Outstanding hardness: α-alumina (Mohs 9) is the basis of high-performance abrasives and wear-resistant parts.
● Chemical inertness: resists acids, alkalis and oxidation, protecting linings, substrates and supports in harsh processes.
● Electrical insulation with thermal conductivity: ideal for electronic substrates, insulators and heat-dissipating components.
● High surface area (activated grades): up to several hundred m²/g for catalyst support, adsorption and drying duty.
● Full form and grade range: smelter to nano, calcined to activated, with custom particle size and purity.
● Multi-industry reach: one oxide serving smelting, steel, ceramics, abrasives, chemicals, electronics and batteries.
1 Aluminium Smelting (Core Application)
Smelter-grade alumina is the raw material of primary aluminum:
● Cell feed: dissolved in molten cryolite electrolyte and electrolyzed to liquid aluminum in Hall–Héroult cells;
● Airborne feeding: free-flowing sandy grade delivered by pneumatic systems to cell hoppers;
● Environmental control: dry-scrubs fluorides from cell off-gas in alumina-based fume treatment systems.
2 Refractories & Technical Ceramics
● Refractories: high-alumina bricks, castables and furnace linings for steel, glass and cement kilns;
● Structural ceramics: bearing balls, seals, valve components and wear-resistant parts;
● Electronic ceramics: substrates, insulators, spark-plug bodies and microwave components.
3 Abrasives & Polishing
● Abrasive grains: fused and sintered corundum for grinding wheels, belts and cutting tools;
● Polishing media: fine alumina powders for metal, glass, stone and optics finishing;
● Surface preparation: blasting media for cleaning and surface texturing.
4 Catalysts, Adsorbents & Specialty Applications
● Catalyst support: high-surface-area γ-alumina carrying metals for refining, petrochemical and environmental catalysis;
● Desiccant and adsorbent: activated alumina dries gases and liquids and removes fluoride/arsenic from water;
● Filler and additive: reinforcing/filling agent in plastics, rubber, paints and sealants;
● Battery materials: coating and separator component in lithium batteries;
● Chromatography and analysis: stationary-phase material for laboratory separations.
Packaging (customizable):
● 25 kg / 50 kg woven bag with PE liner, 1,000 kg FIBC, or bulk pneumatic delivery;
Storage:
● Keep in a dry, covered area away from moisture and contamination;
● Keep bags closed between use to prevent moisture pick-up;
● Store away from acids and incompatible materials;
● No special temperature requirements under normal warehouse conditions.
● Factory-direct supply: own production capacity, transparent pricing, no middleman markup;
● Stable quality: strict internal control, every batch tested, COA with every shipment,small trial orders accepted.;
● Export experience: familiar with sea/air shipping documentation for chemical commodities, complete paperwork support;
Its largest use is as the feedstock of primary aluminum production (about 2 tons of alumina per ton of aluminum). It is also the core material of refractories and technical ceramics, a corundum-based abrasive and polishing media, a high-surface-area catalyst support and desiccant, and a specialty filler in plastics, electronics and batteries.
Aluminum oxide is essentially non-toxic and not classified as hazardous under most regulations.Use dust masks and goggles when handling powders, and avoid generating airborne dust. It is an industrial material, not a food ingredient.
