How to Choose Alumina Products? — A Practical Guide from Fundamental Concepts to Application Categories

In inorganic chemistry, materials science, and analytical laboratories, alumina (Al₂O₃) is virtually everywhere: it is not only the textbook example of an amphoteric oxide, but also a key raw material for ceramic substrates, grinding media, chromatographic packing, desiccants, and catalyst supports.

However, when we actually try to purchase alumina, we are confronted with a wide range of labels: nano alumina, acidic/neutral/basic alumina, mesoporous alumina, activated alumina, spectral-grade alumina, spherical alumina, alumina wool, certified reference materials… What are the real differences between them? How should we choose?

This article aims to clarify:

• What is alumina, and what common characteristics does it have?
• Into which major categories can commonly used alumina products on the market be grouped?
• What are the key features and typical applications of each category?
• What do the common test items on the technical datasheet and COA actually represent?
• How can we quickly select suitable products for different application scenarios?

We will start from basic concepts and classification to build a clear overall picture of alumina; then, with the Aladdin product list at the end of the article, we will map these categories to specific catalog numbers.

I. What Is Alumina?

(a) Chemical formula: Al₂O₃

(b) Basic properties:

• High melting point (about 2050 °C) and good thermal stability;
• High hardness, excellent wear and corrosion resistance;
• Excellent electrical insulation properties; a typical insulating ceramic material;
• Amphoteric oxide: reacts with strong acids to form aluminum salts, and forms aluminates/meta-aluminates in strong alkaline solutions.

(c) Common crystal phases:

• α-phase: Thermodynamically most stable; dense structure and high hardness; widely used in structural ceramics and abrasive materials.
• γ-phase and other transition phases (such as δ, θ, η, χ, κ, etc.): Rich in pores with high specific surface area; typically used as adsorbents, catalysts, or catalyst supports.

Even though the chemical formula is always Al₂O₃, differences in purity, crystal phase, particle size, pore structure, and surface properties give rise to many distinct “alumina products”. Transition phases can be transformed into one another by heat treatment, and the specific surface area and pore structure will change accordingly.

II. Major Categories of Alumina Products

From the perspectives of application and physical properties, commonly used alumina products can be broadly divided into the following categories:

1. General-purpose alumina powders

Analytical reagent (AR), chemically pure (CP), industrial-grade, and other powders commonly used in teaching and basic laboratory experiments.

2. High-purity / spectral-grade / trace-analysis-grade alumina

Impurity elements—especially metallic impurities—are strictly controlled. These products are often labeled “metals basis ≥99.99%” or even ≥99.999%, and are available as powders, lumps, ultra-dry powders, and single-crystal substrates.

3. Nano alumina powders and dispersions

α- or γ-phase nanopowders, aqueous or alcohol-based dispersions, nano slurries, as well as special morphologies such as nanowires and nanosheets.

4. Acidic / neutral / basic alumina and chromatographic stationary phases

Surface acidity/basicity is adjusted by acid/alkali treatment. These are used in column chromatography, thin-layer chromatography (TLC), and certain adsorption or decolorization processes.

5. Mesoporous / modified alumina and specific-surface-area reference materials

Mesoporous materials with defined specific surface area, pore volume, and pore size; functional alumina whose surface has been modified with acids or heteropolyacids; and certified reference materials used for BET and pore-size analyses.

6. Alumina for grinding media / packing materials and elemental analysis

For example, microcrystalline alumina balls, spherical packing bodies, alumina wool, and alumina balls designed for elemental analysis.

7. Activated alumina powders and activated alumina balls (porous, mainly γ-phase)

Porous γ-phase alumina powders with adjustable surface pH; spherical activated alumina widely used as desiccants, adsorbents, and catalyst supports.

III. Features and Typical Applications of Each Alumina Category

3.1 General-Purpose Alumina Powders:

The "White Mainstay" of Classrooms and Basic Experiments

Features

1. White, micron-sized powder;

2. Mostly CP, AR and similar grades;

3. Focus is on Al₂O₃ content and common impurities (Fe, Na, Si, etc.).

Typical applications

1. Inorganic and general chemistry experiments in middle schools and universities;

2. Demonstrations of amphoteric oxide behavior and preparation of aluminum salt solutions;

3. Preliminary ceramic sintering and small-scale formulation exploration.

For routine teaching or basic experiments where impurity levels are not critical, general-purpose alumina powders are usually sufficient.

3.2 High-Purity / Spectral-Grade / Trace-Analysis-Grade Alumina:

Matrix for High-End Analysis and High-Purity Materials

Features

1. Very high purity, typically labeled as metals basis ≥99.99% or ≥99.999%;

2. Available as powders, lumps, ultra-dry powders, and single-crystal substrates with specified orientations;

3. The COA provides detailed concentrations of multiple trace metallic impurities.

Typical applications

1. Used in ICP-MS, ICP-OES, atomic absorption, and other trace analysis techniques as spectral-grade reagents, matrix/standard precursors, or raw materials for high-purity materials;

2. High-purity ceramics, electronic packaging materials, insulating substrates;

3. Optical, electronic, and optoelectronic devices that are extremely sensitive to impurities;

4. Single-crystal Al₂O₃ substrates for epitaxial growth and thin-film device fabrication.

Selection tips

1. Pay attention to the “metals basis” label and key impurities (such as Fe, Na, K, Cu, Pb, etc.);

2. Choose particle size and crystal phase according to sintering process and device requirements (for example, fine α-phase powders promote densification).

3.3 Nano Alumina Powders and Dispersions:

Reinforcing Fillers for Nanomaterials and Functional Coatings

Features

1. Particle size typically ranges from a few nanometers to several hundred nanometers;

2. α-phase nanopowder: Dense structure, suitable for structural ceramics and wear-resistant coatings;

3. γ-phase nanopowder: Highly porous with large specific surface area, suitable for adsorbents and catalysts;

4. Available as dry powders, aqueous dispersions, or alcohol-based dispersions to mitigate agglomeration and dispersion challenges;

5. Some products feature special morphologies such as nanowires and nanosheets.

Typical applications

1. Transparent coatings, hard coatings, and wear-resistant coatings;

2. Reinforcement of polymer/rubber nanocomposites;

3. Nano fillers for insulating and dielectric materials;

4. Fundamental research on nanodevices, sensors, and functional thin films.

Selection tips

1. Focus on three core parameters: particle size, crystal phase, and specific surface area;

2. When slurry preparation and coatability are critical, prefabricated aqueous or alcoholic dispersions can be prioritized;

3. For high-temperature mechanical strength → favor α-phase;

for adsorption/catalysis → favor γ-phase or high–specific-surface-area grades.

3.4 Acidic / Neutral / Basic Alumina and Chromatographic Stationary Phases:

Versatile Tools for Organic Separation

Features

1. Particle size is expressed in mesh, such as 100–200 mesh or 200–300 mesh;

2. Surface is treated to be acidic, neutral, or basic;

3. Some products are labeled “activated”, indicating lower moisture content and more stable adsorption performance;

4. The same type of alumina can serve as column chromatography packing or as an adsorbent/decolorizing agent.

Typical applications

1. Column chromatography separation and purification of organic synthesis products;

2. Separation of natural products, pigments, lipids, etc.;

3. Deacidification, decolorization, and impurity removal in certain systems;

4. Condition screening and teaching applications using alumina-based TLC stationary phases.

Quick rule of thumb: how to choose acidic/neutral/basic alumina?

1. To separate acidic compounds (e.g., carboxylic acids) → choose basic alumina;

2. To separate basic compounds (e.g., amines, nitrogen-containing heterocycles) → choose acidic alumina;

3. To separate neutral compounds → neutral alumina is generally the safest choice;

4. Finer particles (higher mesh number) usually give higher separation efficiency, but also higher column backpressure;

5. For highly sensitive or easily decomposed acidic/basic compounds, be cautious of irreversible adsorption or degradation on acidic/basic alumina; consider screening conditions first with neutral alumina or silica gel.

3.5 Mesoporous / Modified Alumina and Specific-Surface-Area Reference Materials:

Property Benchmarks for Adsorption and Catalysis

Features

1. Mesoporous alumina: Defined specific surface area, total pore volume, and average pore size, with tunable pore structures;

2. Modified alumina: Surface modified with acids, heteropolyacids, metal oxides, etc., to adjust surface acidity, hydrophilicity/hydrophobicity, or introduce specific functional groups;

3. Reference materials: Supplied with certified values and uncertainties for calibrating and validating BET, pore-size, and specific-surface-area measurements.

Typical applications

1. Experiments and teaching involving adsorption isotherms and pore-structure characterization;

2. Design and comparative evaluation of adsorbents and catalyst supports;

3. “Reference materials” or performance benchmarks in water treatment, gas adsorption, and related applications.

3.6 Alumina for Grinding Media / Packing Materials and Elemental Analysis:

Practical Helpers for Processes and Instruments

Features and applications

1. Grinding media: High-strength microcrystalline alumina balls for ball mills, sand mills, and stirred mills; key parameters include compressive strength, wear rate, and density.

2. Packing materials: High-purity spherical alumina used as tower packing and bed support media, requiring high mechanical strength and chemical inertness.

3. Elemental analysis accessories: Alumina wool, alumina balls, etc., used in elemental analyzers and combustion tubes to support or fix samples, while also providing basic adsorption capacity.

3.7 Activated Alumina Powders and Activated Alumina Balls:

Porous Materials for Drying, Adsorption, and Catalysis

Features

1. Mostly γ-phase, highly porous, with specific surface areas ranging from tens to several hundred m²/g;

2. Powder products can be classified as acidic, neutral, or basic according to surface pH;

3. Spherical activated alumina has defined particle-size ranges and high mechanical strength, making it suitable for packing in towers and fixed beds;

4. Product data often includes water adsorption capacity, adsorption capacity for specific ions (such as fluoride or arsenic), and regeneration conditions.

Typical applications

1. Drying of gases and liquids (compressed air, natural gas, oxygen/hydrogen generation units, etc.);

2. Defluoridation, dearsenication, and removal of certain heavy metals in drinking water or industrial wastewater;

3. Catalyst supports and solid acid/base catalysts in petrochemical and related fields;

4. Various adsorption-based separation and purification processes.

Selection tips

1. For drying applications → focus on specific surface area, water uptake, regeneration temperature, and mechanical strength;

2. For water treatment → focus on adsorption capacity for target ions, leachable impurities, and compliance with relevant drinking-water standards;

3. For catalysis → pay attention to pore-size distribution, surface acidity/basicity, and thermal stability.

IV. Common Test Items for Alumina Products:

How to Read the TDS and COA?

Regardless of the alumina category, the technical data sheet (TDS) and Certificate of Analysis (COA) will typically include the following information:

1. Purity / metals basis

(a) Examples: “≥99%”, “≥99.9% metals basis”, “≥99.999% metals basis”;

(b) “Metals basis” refers to purity calculated on the total content of metallic elements. It only counts the main element Al and other metallic impurities, and does not include water, volatiles, carbon, or other non-metallic components. This is especially important for spectroscopic analysis and high-purity material preparation where trace-metal backgrounds must be strictly controlled.

2. Crystal phase (Phase)

(a) Typically labeled as α, γ, etc.; α-phase is more suitable for structural ceramics, while γ-phase is mainly used for adsorption and catalysis;

(b) Some products may be labeled as “nanocrystalline α-phase”, “multi-phase mixture”, and similar descriptions.

3. Particle size / mesh

(a) Nanopowders are specified in nm; conventional powders in μm;

(b) Chromatography-grade materials are usually specified in mesh. The higher the mesh number, the finer the particles—generally giving higher separation efficiency, but also greater flow resistance.

4. Specific surface area, total pore volume, average pore size

(a) Measured using BET surface area analyzers and pore-size analyzers;

(b) These are key parameters for evaluating the performance of adsorbents and catalyst supports.

5. Surface acidity/basicity or pH

(a) Described as acidic/neutral/basic alumina, or given directly as the pH of an aqueous slurry of the powder;

(b) This has a major impact on chromatographic separation and the selectivity of catalytic reactions.

6. Moisture content and loss on ignition (LOI)

(a) Reflect the amount of crystalline water and volatile components in the sample;

(b) They influence high-temperature processing behavior and the regeneration performance of activated alumina.

7. Mechanical strength and wear rate (mainly for spherical particles)

(a) Indicate the stability of the particles during packing and long-term operation;

(b) These parameters are critically important for drying towers, adsorption columns, and fixed-bed reactors.

V. How Should Different Users Select Alumina According to Their Needs?

5.1 Students & Teaching Laboratories

1. Purpose: Demonstrating chemical properties and basic experimental techniques.

2. Recommendations:

• General-purpose alumina powders (CP/AR grade) are sufficient;
• If chromatography or TLC is involved in teaching, additionally select acidic/neutral/basic alumina and dedicated TLC stationary phases.

5.2 General Research (Materials, Synthesis, Separation)

• Materials and ceramics research → Use general-purpose or high-purity powders; select based on particle size and crystal phase.
• Organic synthesis and separation → Choose the appropriate mesh size of acidic/neutral/basic alumina according to the acidity/basicity of the target compounds.
• Work involving specific surface area and pore structure → Give priority to mesoporous alumina, γ-phase alumina, or nano alumina.

5.3 Nanomaterials and Functional Coatings

• Emphasis on mechanical reinforcement or transparency → α-phase nanopowder with a suitable particle size;
• Emphasis on adsorption or catalysis → γ-phase nanopowder, mesoporous alumina, or modified alumina;
• Desire to simplify preparation and improve dispersibility → Use ready-to-use aqueous or alcohol-based dispersions.

5.4 High-Purity Analysis, Spectroscopy, and Electronic Materials

• Trace metal analysis → Prefer high-purity or spectral-grade alumina (metals basis ≥99.99%);
• High-purity ceramics, electronic packaging, insulating substrates → Choose high-purity fine α-phase powders according to process requirements;
• Thin films and optoelectronic devices → Select high-purity powders or single-crystal substrates as needed.

5.5 Adsorption, Drying, and Catalysis

• Gas/air drying and simple adsorption → Spherical activated alumina desiccants or general-purpose adsorbents;
• Water treatment (defluoridation, dearsenication) → Activated alumina with clearly specified adsorption capacities and compliance with relevant safety standards;
• Catalyst supports and solid acid/base catalysts → γ-phase activated alumina, mesoporous alumina, and their modified derivatives.

5.6 Grinding and Process Packing

• Tumbling or stirred grinding → Microcrystalline alumina balls and other grinding media;
• Support layers or packing in towers → Spherical alumina packing materials;
• Accessories for elemental analysis instruments → Dedicated alumina wool and alumina balls.

Alumina is a material with a simple chemical formula but an exceptionally rich “portfolio of roles”: by tuning purity, crystal phase, particle size, pore structure, and surface properties, it can serve everything from small-scale classroom experiments to high-end optoelectronic devices.

As long as you first identify which application category you fall into (teaching, general research, high-purity analysis, nanomaterials, chromatographic separation, adsorption/drying, grinding/packing, etc.), and then combine this with the product categories and key test parameters described in this article, you can significantly narrow down your selection.

After reading this article, you can further consult the appended alumina product list, which maps each category to specific product specifications, and use it as a practical reference for purchasing decisions or experimental design.

Aladdin Alumina Product Classification and Application Reference Table

Category	Aladdin Cat. No.	Name	CAS No.	Grade / Purity	Application Features
General-purpose alumina powders	A102002	Aluminum oxide	1344-28-1	AR	Analytical reagent–grade alumina, suitable for teaching the properties of amphoteric oxides and for general inorganic experiments.
General-purpose alumina powders	A420214	Aluminum oxide	1344-28-1	≥99% metals basis	≥99% high-purity alumina powder for routine materials preparation and research experiments.
General-purpose alumina powders	A420217	Aluminum oxide	1344-28-1	≥99.9% metals basis	≥99.9% high-purity alumina powder, suitable for experiments with stricter impurity requirements.
High-purity alumina (PrimorTrace/PureSpectra)	A102003	Aluminum oxide	1344-28-1	PureSpectra™, spectral grade, ≥99.999% metals basis	Spectral-grade alumina (metals basis ≥99.999%), suitable for ICP/MS and other trace analysis, as well as high-purity materials.
High-purity alumina (PrimorTrace/PureSpectra)	A102005	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, powder, 5–6 μm	5–6 μm high-purity alumina powder (metals basis ≥99.99%) for the preparation of ceramics and insulating components.
High-purity alumina (PrimorTrace/PureSpectra)	A102006	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, coating grade	High-purity coating-grade alumina powder (metals basis ≥99.99%), suitable as a precursor for films and coatings.
High-purity alumina (PrimorTrace/PureSpectra)	A140802	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis	High-purity alumina (metals basis ≥99.99%) for trace analysis and high-purity materials research.
High-purity alumina (PrimorTrace/PureSpectra)	A406645	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, powder, 6–7 μm	6–7 μm high-purity alumina powder (metals basis ≥99.99%), suitable for high-purity ceramics and insulating materials.
High-purity alumina (PrimorTrace/PureSpectra)	A491592	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, ≤10 μm	≤10 μm high-purity alumina powder (metals basis ≥99.99%) for ceramic substrates and functional fillers.
High-purity alumina (PrimorTrace/PureSpectra)	H102613	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, α-phase, 0.20 μm	0.20 μm α-phase high-purity alumina powder (metals basis ≥99.99%), suitable for high-purity ceramics and electronic materials.
High-purity alumina (PrimorTrace/PureSpectra)	H299537	Aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, α-phase, 0.40 μm	0.40 μm α-phase high-purity alumina powder (metals basis ≥99.99%) for high-temperature structural and electrical insulating materials.
Special high-purity alumina (lumps / ultra-dry / single crystal)	A119032	Aluminum oxide	1344-28-1	≥99.998% metals basis, lumps	Ultra-high-purity alumina lumps, used as raw material for high-purity melts or single-crystal growth.
Special high-purity alumina (lumps / ultra-dry / single crystal)	A431928	Aluminum oxide	1344-28-1	Ultra-dry grade	Ultra-dry alumina powder with extremely low moisture content, suitable for moisture-sensitive systems or precursor preparation.
Special high-purity alumina (lumps / ultra-dry / single crystal)	A431929	Aluminum oxide	1344-28-1	Single-crystal substrate <0001>	<0001>-oriented alumina single-crystal substrate for epitaxial growth, thin films, and optoelectronic device research.
Nano alumina powders	A102091	Nano aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, nanopowder, γ-phase, 20 nm	γ-phase 20 nm high-purity nano alumina powder, suitable for catalyst supports and high–specific-surface-area materials research.
Nano alumina powders	A299044	Aluminum oxide	1344-28-1	≥99.8% metals basis, 13 nm (TEM)	13 nm high-purity alumina nanopowder for transparent ceramics, coatings, and nanocomposites.
Nano alumina powders	A299286	Nano aluminum oxide	1344-28-1	≥99.9% metals basis, powder, α-phase, 150 nm	150 nm α-phase nano alumina for high-temperature structural ceramics and wear-resistant materials.
Nano alumina powders	A299287	Nano aluminum oxide	1344-28-1	≥99.9% metals basis, powder, mixture of α-phase, 30 nm	30 nm mixed-phase nano alumina powder, suitable as a functional filler for polymers and coatings.
Nano alumina powders	A396574	Nano aluminum oxide	1344-28-1	≥99.9% metals basis, γ-phase, <50 nm	<50 nm γ-phase nano alumina with large specific surface area, suitable for adsorption and catalysis.
Nano alumina powders	A431930	Aluminum oxide	1344-28-1	Nanopowder, <50 nm (TEM)	<50 nm alumina nanopowder for nanocomposites and functional coatings.
Nano alumina powders	A431931	Aluminum oxide	1344-28-1	Nanowires, diameter × L 2–6 nm × 200–400 nm	One-dimensional alumina nanowires (2–6 nm × 200–400 nm), used in nanodevices and template research.
Nano alumina powders	A489818	Aluminum oxide	1344-28-1	≥99.9% metals basis, crystal form Y phase, 15 nm	15 nm Y-phase nanocrystalline alumina for high–specific-surface-area nanomaterials research.
Nano alumina powders	A498369	Nano aluminum oxide	1344-28-1	≥99.9% metals basis, α-phase, 200–400 nm	200–400 nm α-phase nano alumina for structural ceramics, wear-resistant coatings, and composites.
Nano alumina powders	H102616	Nano-grade aluminum oxide	1344-28-1	PrimorTrace™, ≥99.99% metals basis, γ-phase, ≤20 nm	≤20 nm γ-phase high-purity nano alumina, suitable for high-end catalytic and electronic materials.
Nano alumina powders	V1375751	Vapor-phase nano aluminum oxide	1344-28-1	Hydrophilic, ≥98%, specific surface area (BET): 100 m²/g; particle size: 10–30 nm	Vapor-phase hydrophilic nano alumina (10–30 nm, BET ≈100 m²/g) for coatings and functional fillers.
Nano alumina dispersions	A119403	Nano aluminum oxide alcohol dispersion	1344-28-1	30 nm particle size, 20 wt.% isopropanol solution	20 wt.% dispersion of 30 nm alumina in isopropanol, suitable for coatings or resin modification in organic systems.
Nano alumina dispersions	A119404	Nano aluminum oxide aqueous dispersion	1344-28-1	5–10 nm particle size, 20 wt.% aqueous solution	5–10 nm alumina aqueous dispersion (20 wt.%), suitable for high-transparency waterborne coatings and functional slurries.
Nano alumina dispersions	A119405	α-phase nano aluminum oxide slurry	1344-28-1	α-phase, 30 nm particle size, 20 wt.% aqueous solution	α-phase 30 nm alumina aqueous slurry (20 wt.%), suitable for waterborne ceramic slurries or as a filler in coatings.
Nano alumina dispersions	A283857	Nano aluminum oxide aqueous dispersion	1344-28-1	30 nm particle size, 20 wt.% aqueous solution	30 nm alumina aqueous dispersion (20 wt.%) for waterborne coatings and nanocomposites.
Nano alumina dispersions	A493162	Nano aluminum oxide aqueous dispersion	1344-28-1	<30 nm particle size, 20 wt.% aqueous solution	<30 nm alumina aqueous dispersion (20 wt.%), convenient for direct addition into waterborne systems to prepare nanomaterials.
Acidic alumina (chromatography/adsorption)	A102071	Acidic aluminum oxide	1344-28-1	200–300 mesh	200–300 mesh acidic alumina for fine separation of basic components and nitrogen-containing heterocycles.
Acidic alumina (chromatography/adsorption)	A359368	Acidic aluminum oxide	1344-28-1	100–200 mesh, ≥75%	100–200 mesh acidic alumina for column chromatography of basic compounds and amines.
Acidic alumina (chromatography/adsorption)	A397774	Acidic aluminum oxide	1344-28-1	200–300 mesh, ≥70%	200–300 mesh acidic alumina suitable for efficient separation of amines and other basic components.
Neutral alumina (chromatography/adsorption)	A165127	Neutral aluminum oxide	1344-28-1	Neutral, 60–100 mesh	60–100 mesh neutral alumina as a general-purpose column chromatography packing.
Neutral alumina (chromatography/adsorption)	A359389	Neutral aluminum oxide	1344-28-1	100–200 mesh, ≥75%, activated	100–200 mesh activated neutral alumina for column chromatography separation of organic synthesis products.
Neutral alumina (chromatography/adsorption)	A359395	Neutral aluminum oxide	1344-28-1	200–300 mesh, ≥70%, activated	200–300 mesh activated neutral alumina with fine particles for high-resolution separations.
Neutral alumina (chromatography/adsorption)	A397767	Neutral aluminum oxide	1344-28-1	60–100 mesh, ≥75%	60–100 mesh neutral alumina suitable for medium-pressure column chromatography and scale-up separations.
Basic alumina (chromatography/adsorption)	A100282	Basic aluminum oxide	1344-28-1	100–200 mesh	100–200 mesh basic alumina for column chromatography separation of acidic organic compounds.
Basic alumina (chromatography/adsorption)	A359000	Basic aluminum oxide	1344-28-1	200–300 mesh, ≥70%	200–300 mesh basic alumina suitable for high-resolution separation of acidic compounds.
Basic alumina (chromatography/adsorption)	A359354	Basic aluminum oxide	1344-28-1	100–200 mesh, ≥75%	100–200 mesh general-purpose basic stationary phase for the separation of various organic compounds.
Alumina stationary phase for TLC	A102007	Aluminum oxide G	1344-28-1	For TLC	Alumina stationary phase for thin-layer chromatography (TLC), used for organic compound separation and teaching.
Mesoporous/modified alumina	A396536	Aluminum oxide	1344-28-1	Phosphotungstic-acid-modified alumina	Phosphotungstic-acid-modified alumina with solid acidity, suitable as an acidic catalyst or catalyst support.
Mesoporous/modified alumina	A431927	Mesoporous aluminum oxide	1344-28-1	MSU-X (wormhole), average pore size 3.8 nm	MSU-X wormhole-structured mesoporous alumina with large specific surface area, suitable for adsorption and catalyst-support research.
Specific-surface-area / pore-structure reference materials	A119593	Low specific-surface-area reference material	1344-28-1	Low specific surface area: 0.221 m²/g	Low specific-surface-area reference material for testing small-surface-area samples and instrument calibration.
Specific-surface-area / pore-structure reference materials	A119598	Mesoporous Al₂O₃ specific surface area, total pore volume and pore size reference material	1344-28-1	Specific surface area: 144.8 m²/g; total pore volume: 0.260 cm³/g; average pore size: 7.19 nm	Mesoporous alumina reference material for validating BET and pore-structure methods (surface area / pore volume / pore size).
Specific-surface-area / pore-structure reference materials	A489899	Al₂O₃ specific surface area reference material	1344-28-1	Specific surface area: 5.78 m²/g	Alumina specific-surface-area reference material for calibration of surface-area analyzers.
Specific-surface-area / pore-structure reference materials	A615381	Mesoporous Al₂O₃ specific surface area, total pore volume and pore size reference material	1344-28-1	Specific surface area: 102.5 m²/g; total pore volume: 0.259 cm³/g; average pore size: 10.11 nm	Mesoporous alumina reference material suitable for verifying specific-surface-area and pore-volume measurements over different pore-size ranges.
Alumina balls for grinding/packing	M1492672	Microcrystalline alumina balls	1344-28-1	For grinding media, Al₂O₃ ≥95%, compressive strength ≥2250	High-strength microcrystalline alumina balls, suitable as grinding media for ball mills, sand mills, etc.
Alumina balls for grinding/packing	S1492676	Spherical aluminum oxide	1344-28-1	≥99.7%, used as packing	High-purity spherical alumina used as tower packing or as bed support media in catalyst beds.
Alumina for elemental analysis / instrument accessories	A124532	Alumina wool	1344-28-1	For elemental analysis, wool	Alumina wool for supporting and packing samples in combustion tubes or sample tubes for elemental analysis.
Alumina for elemental analysis / instrument accessories	A124531	Alumina balls	1344-28-1	For elemental analysis, 2–4 mm airball	2–4 mm alumina balls used as packing and support materials in elemental analyzers and related instruments.
Activated alumina powders (γ-phase)	A1492645	Activated aluminum oxide	1344-28-1	γ-phase, pH 7 ± 1, Al₂O₃ ≥99%	γ-phase activated alumina powder with neutral surface (pH ≈7), used as a general-purpose adsorbent and catalyst support.
Activated alumina powders (γ-phase)	A1492647	Activated aluminum oxide	1344-28-1	γ-phase, pH 5 ± 1, Al₂O₃ ≥99%	γ-phase slightly acidic activated alumina powder (pH ≈5), suitable for acidic catalysis and adsorption processes.
Activated alumina powders (γ-phase)	A1492651	Activated aluminum oxide	1344-28-1	γ-phase, pH 9 ± 1, Al₂O₃ ≥99%	γ-phase slightly basic activated alumina powder (pH ≈9), suitable for basic catalysis and adsorption.
Activated alumina balls	A1492662	Activated alumina balls	1344-28-1	Used as adsorbent, general type	General-purpose activated alumina beads used as adsorbents for impurity removal in liquid and gas phases.
Activated alumina balls	A1492666	Activated alumina balls	1344-28-1	Used as desiccant, general type	Activated alumina desiccant beads for drying compressed air, gases, and organic solvents.
Activated alumina balls	A1492668	Activated alumina balls	1344-28-1	Used as catalyst support	Activated alumina beads used as catalyst supports in fixed-bed reactors and petrochemical processes.

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