Astrra Chemicals

Astrra Chemicals

Chennai, Tamil Nadu
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Aluminium Oxide

Manufacturer of a wide range of products which include aluminum oxide grit 80 (brown), white aluminum oxide grits, aluminium oxide white ( grit - 80m ), aluminum white oxide powder and aluminum hydroxide powder.

Aluminum Oxide Grit 80 (Brown)

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Approx. Price: Rs 98 / KgGet Latest Price
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Product Details:

Minimum Order Quantity50 Kg
Purity98 %
Grit Size36 mesh
MaterialCOURSE
Alumina Purity95 %
FormGRIT
GradeBrown
UsageRefractory, Blasting, Flooring
Packaging Size50 kg
Hardness9.5 Moh
BrandAstrra Chemicals

Uses and applications of Brown Aluminium Oxide (also known as Brown Fused Alumina or BFA) across various industries:

🔶 What is Brown Aluminium Oxide?

Brown Aluminium Oxide is a hard, tough, and durable abrasive material made by fusing bauxite in an electric arc furnace. It consists mainly of Aluminum Oxide (Al₂O₃) with a small percentage of Titania (TiO₂) and other impurities.

  • Hardness: ~9 on Mohs scale

  • Color: Brown

  • Melting Point: ~2,050°C

  • Typical Grit Sizes: F12 to F220 (macro), F240 to F1200 (micro)

🛠️ Primary Applications:1. Abrasives Industry
  • Grinding wheels: Used in resin-bonded and vitrified wheels for grinding hardened steel, alloy steel, and cast iron.

  • Sandpaper & abrasive cloth: Ideal for both wet and dry applications.

  • Blasting media: For surface preparation, rust removal, and finishing of metals, concrete, and composites.

  • Polishing: Suitable for rough and intermediate polishing operations.

2. Refractory Industry
  • Refractory bricks & castables: Used in linings for furnaces, kilns, and incinerators due to its high heat resistance.

  • Ceramic shapes & tiles: In applications requiring thermal stability and abrasion resistance.

3. Surface Preparation
  • Shot blasting and sandblasting: For cleaning, deburring, and roughening surfaces before coating or painting.

  • Etching & frosting of glass: Achieves decorative or functional textures.

4. Metalworking
  • Lapping & honing: In precision metal finishing.

  • Tool sharpening: Used in stones and belts for sharpening cutting tools.

5. Anti-Skid Surfaces
  • Used in floor coatingsrunways, and steps for enhancing traction and preventing slips.

6. Ceramic & Tile Industry
  • As a raw material additive to improve wear resistance and strength of ceramics.

7. Water Filtration
  • Sometimes used as a media in industrial filtration systems, especially for high-speed filtration of contaminants.

✅ Advantages of Brown Aluminium Oxide:
  • High hardness and toughness

  • Reusable in blasting applications

  • Thermally stable at high temperatures

  • Electrically non-conductive

  • Cost-effective compared to White Fused Alumina

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White Aluminum Oxide Grits

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Approx. Price: Rs 185 / KgGet Latest Price
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Product Details:

Minimum Order Quantity100 Kg
Purity99 %
Grit SizeF36
Grade30 M Grit
Formgrit
UsageBlasting, Refractory, Polishing
Hardness9.5 Moh
Packaging Size50 Kgs Bags
Packaging TypeBags
MaterialAluminium Oxide
Bulk Density1.6 g/cc

ALUMINIUM OXIDE WHITE ( GRIT - 80M )

We are the leading manufactures, exporters,technical developers and suppliers of Aluminum Oxide ( White ) ( Grit - 80 ) in Chennai, Tamil Nadu, 

Aluminium Oxide White (Grit 80M) — also known as White Fused Alumina (WFA) — is a high-purity abrasive made from fusing alumina (Al₂O₃) in electric arc furnaces. The "Grit 80M" 

�� Key Properties of Aluminium Oxide White (80M Grit)
  • Hardness: ~9 on the Mohs scale (second only to diamond)

  • Purity: >99% Al₂O₃ (low iron content)

  • Color: White (non-contaminating)

  • Chemically inert and corrosion-resistant

  • High melting point: ~2,050°C

�� Uses & Applications by Industry I. Surface Preparation & Abrasive Blasting
  • Primary Use: Grit blasting for cleaning, deburring, and etching surfaces (especially non-ferrous metals).

  • Why Use White Grit:

    • Non-contaminating (ideal for stainless steel, aluminum, titanium)

    • Produces uniform surface profile

    • Leaves no residues, ideal for pre-coating treatments

Applications:
  • Cleaning turbine blades, engine parts

  • Surface prep for plasma spray coatingpainting, or adhesive bonding

  • Matting glass or ceramic surfaces

II. Grinding & Polishing
  • Used in:

    • Grinding wheels

    • Sanding belts

    • Lapping compounds

    • Polishing pastes

  • 80M Grit is suitable for medium-to-fine surface finishes on:

    • Steel tools

    • Glass components

    • Precious metals

    • Ceramic parts

III. Ceramic & Refractory Industry
  • As filler or raw material in high-performance ceramics and refractory bricks due to:

    • High melting point

    • Thermal shock resistance

  • Applications:

    • Kiln furniture

    • Crucibles

    • Insulating bricks

IV. Flooring & Anti-Slip Surfaces
  • Alumina grit is embedded into epoxy coatingsresin floors, or tiles to improve:

    • Abrasion resistance

    • Anti-slip properties

  • Grit 80M offers a balance between grip and cleanability.

V. Laminates & Decorative Surfaces
  • Used in decorative laminates (e.g., countertops, panels) for:

    • Surface hardness

    • Scratch resistance

    • Improved durability


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Aluminium Oxide White ( Grit - 80m )

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Product Details:

Minimum Order Quantity100 Kg
Purity99.8 %
MaterialAluminium Oxide ( Grit )
Grit SizeF100
UsagePolishing, Refractory, Blasting, Coated Abrasive, Grinding
Packaging Size50 kg
Hardness9.5 Moh
Packaging TypeHDPE BAGS
Bulk Density1.6 g/cc
SizesGrit - 80
ColorPure White

ALUMINIUM OXIDE WHITE ( GRIT - 80M )

We are the leading manufactures, exporters,technical developers and suppliers of Aluminum Oxide ( White ) ( Grit - 80 ) in Chennai, Tamil Nadu, 

Aluminium Oxide White (Grit 80M) — also known as White Fused Alumina (WFA) — is a high-purity abrasive made from fusing alumina (Al₂O₃) in electric arc furnaces. The "Grit 80M" 

�� Key Properties of Aluminium Oxide White (80M Grit)
  • Hardness: ~9 on the Mohs scale (second only to diamond)

  • Purity: >99% Al₂O₃ (low iron content)

  • Color: White (non-contaminating)

  • Chemically inert and corrosion-resistant

  • High melting point: ~2,050°C

�� Uses & Applications by Industry I. Surface Preparation & Abrasive Blasting
  • Primary Use: Grit blasting for cleaning, deburring, and etching surfaces (especially non-ferrous metals).

  • Why Use White Grit:

    • Non-contaminating (ideal for stainless steel, aluminum, titanium)

    • Produces uniform surface profile

    • Leaves no residues, ideal for pre-coating treatments

Applications:
  • Cleaning turbine blades, engine parts

  • Surface prep for plasma spray coating, painting, or adhesive bonding

  • Matting glass or ceramic surfaces

II. Grinding & Polishing
  • Used in:

    • Grinding wheels

    • Sanding belts

    • Lapping compounds

    • Polishing pastes

  • 80M Grit is suitable for medium-to-fine surface finishes on:

    • Steel tools

    • Glass components

    • Precious metals

    • Ceramic parts

III. Ceramic & Refractory Industry
  • As filler or raw material in high-performance ceramics and refractory bricks due to:

    • High melting point

    • Thermal shock resistance

  • Applications:

    • Kiln furniture

    • Crucibles

    • Insulating bricks

IV. Flooring & Anti-Slip Surfaces
  • Alumina grit is embedded into epoxy coatings, resin floors, or tiles to improve:

    • Abrasion resistance

    • Anti-slip properties

  • Grit 80M offers a balance between grip and cleanability.

V. Laminates & Decorative Surfaces
  • Used in decorative laminates (e.g., countertops, panels) for:

    • Surface hardness

    • Scratch resistance

    • Improved durability

VI. Filtration Media
  • Acts as a filter media in high-temperature or corrosive fluid systems where other materials fail.

  • Also used in water purification systems as a non-reactive, inert support layer.

VII. Precision Casting & Investment Casting
  • Used as a shell material or mold additive in investment casting due to:

    • Thermal stability

    • Non-wettability with molten metals

  • Ensures smooth casting surfaces, especially in aerospace or medical applications.

VIII. Electronics & Semiconductor Industry
  • Acts as a polishing agent in semiconductor wafer processing.

  • Sometimes used as an insulating material in ceramic substrates.


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Aluminum White Oxide Powder

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Approx. Price: Rs 125 / KgGet Latest Price
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Product Details:

Minimum Order Quantity100 Kg
Al2O3 Content99.8%
Alumina GradeRefractory
Grit Size400m
UsageBlasting, Refractory, Coated Abrasive, Polishing
Purity99.8 %
FormPowder
Particle Size400M
Hardness9.5 Moh
MaterialAluminium Oxide
Packaging Size25 kg

White Aluminum Oxide ( Grit - 220 ) 

We are the leading manufactures, exporters,technical developers and suppliers of White Aluminum Oxide ( Grit - 220 ) in Chennai, Tamil Nadu, 



Aluminium Oxide Powder White (Grade - 400 M) is a high-purity, fine-micronized abrasive material with excellent hardness and thermal stability. It is widely used in polishing and other industrial applications due to its physical and chemical properties.

🔹 USES & APPLICATIONS of Aluminium Oxide Powder White (Grade - 400 M)1. Polishing & Lapping
  • Used for fine polishing and lapping of metals, glass, ceramics, and semiconductors.

  • Ideal for mirror finishing in optical components and precision instruments.

  • Used in jewelry and watch polishing due to its fine abrasive quality.

2. Abrasive Industry
  • Acts as a micro-abrasive in coated abrasives, non-woven pads, and polishing compounds.

  • Used in abrasive pastes, slurries, and suspensions for surface refinement.

3. Refractory Applications
  • Added as a raw material in high-alumina refractory formulations for better wear resistance and thermal stability.

  • Used in casting molds for high-temperature alloys.

4. Ceramics Industry
  • Used in the production of technical ceramics, where purity and particle size control are essential.

  • Helps improve density, strength, and thermal resistance in finished ceramics.

5. Surface Preparation & Coatings
  • Utilized for surface roughening before coatings or plating.

  • Helps enhance adhesion of paints and coatings in automotive, aerospace, and electronics.

6. Electronics & Semiconductor Industry
  • Used in CMP (Chemical Mechanical Polishing) for silicon wafers.

  • Suitable for thin-film polishing and surface conditioning.

7. Laboratory & Research
  • Used as a standard abrasive in laboratory-scale experiments.

  • Employed in materials testing and tribology studies for wear analysis.

8. Dental and Medical Applications
  • Included in dental polishing pastes and compounds.

  • Used in orthopedic and prosthetic surface finishing.

🔸 Product Highlights
  • Purity: High (>99%)

  • Particle Size: Micronized to 400 mesh (fine powder)

  • Color: White

  • Mohs Hardness: ~9 (second only to diamond)

  • Non-reactive, chemically stable, and heat-resistant


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Aluminum Hydroxide Powder

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Approx. Price: Rs 72 / KgGet Latest Price
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Product Details:

Minimum Order Quantity50 Kg
ApplicationIndustrial
Al2O3 Content60–65%
Grade StandardINDUSTRIAL
Purity99%
Mesh Size200 mesh
Bulk Density0.20–0.40 g/ml
Packaging Size50 kg
Packaging TypeBag
AppearanceWhite Powder
Loss On Ignition≤12.0%

Aluminum Hydroxide Powder (Al(OH)₃) is a versatile, fine white powder widely used in various industries for its flame retardant properties, as a filler, and for its chemical characteristics.

Here’s a brief overview of the uses and applications of Aluminum Hydroxide Powder:

1. Flame Retardant
  • Purpose: Fire retardant additive.

  • Applications:

    • Used in plastics, rubber, textiles, and coatings as a flame retardant.

    • Releases water vapor when heated, which cools the material and dilutes flammable gases, reducing fire spread.

    • Often used in electrical cables, insulation materials, and construction products for fire safety.

2. Pharmaceuticals
  • Purpose: Antacid and medical excipient.

  • Applications:

    • Used as an antacid to neutralize stomach acid and treat indigestion.

    • Acts as a pharmaceutical excipient and absorbent in medicines.

3. Water Treatment
  • Purpose: Flocculant and purifier.

  • Applications:

    • Used in water purification processes as a flocculating agent to remove impurities.

    • Helps in treating wastewater and drinking water.

4. Paints and Coatings
  • Purpose: Filler and pigment extender.

  • Applications:

    • Used as a white filler to improve paint opacity, durability, and weather resistance.

    • Enhances mechanical properties and surface finish.

5. Rubber Industry
  • Purpose: Filler and flame retardant.

  • Applications:

    • Incorporated in rubber formulations to improve fire resistance and mechanical strength.

    • Helps reduce production costs.

6. Paper Industry
  • Purpose: Filler.

  • Applications:

    • Used as a filler to improve paper brightness, smoothness, and printability.

7. Cosmetics and Personal Care
  • Purpose: Absorbent and opacifying agent.

  • Applications:

    • Used in powders and creams to absorb moisture and improve texture.

Key Features of Aluminum Hydroxide Powder:
  • Non-toxic and environmentally safe.

  • Acts as an effective flame retardant by releasing water on heating.

  • Chemically stable and inert.

  • Enhances mechanical and optical properties in formulations.

 

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Sanklesh Chabria (Managing Partner)
Astrra Chemicals
No.532/1B 3, Vanagaram Road, Ambattur,
Chennai - 600053, Tamil Nadu, India
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07942563792


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