Chromium(III) oxide (Cr2O3) Micron Powder, Purity: 99%, Average Particle Size: 5μm

Description

Chromium(III) Oxide (Cr₂O₃) Micron Powder – 99% Purity, Avg. 5 μm

High-Purity Green Chromium Oxide Powder for Pigments, Ceramics, Stropping, and Industrial Use

Product Description

Chromium(III) Oxide (Cr₂O₃) is a highly stable, green-colored inorganic compound, widely used across pigment, ceramic, polishing, and magnetic material industries. With 99% purity and an average particle size of 5 μm, this micronized chromium oxide powder is engineered for consistency, reliability, and performance across high-temperature and high-precision applications.

This fine green powder, known historically as viridian, is an essential material for coloring ceramics, glasses, inks, and paints. Thanks to its extreme thermal resistance and chemical stability, it also finds use as a polishing agent (especially in knife stropping compounds), abrasive, and precursor to magnetic materials like chromium dioxide (CrO₂).

Technical Specifications

• Chemical Formula: Cr₂O₃

• Molecular Weight: 151.99 g/mol

• Appearance: Green powder or crystals

• Purity: 99%

• Average Particle Size: 5 μm

• Melting Point: 2435 °C

• Boiling Point: 4000 °C

• Density: 5.22 g/cm³

• Crystal Structure: Hexagonal

• Form: Micronized Powder

Certificate of Analysis (Impurity Levels)

• CrO₃: ≥ 99.3%

• Fe₂O₃: ≤ 0.1%

• Na₂O: ≤ 0.1%

• CeO: ≤ 0.01%

• MgO: ≤ 0.01%

• Al₂O₃: ≤ 0.08%

• SiO₂: ≤ 0.1%

• CaO: ≤ 0.1%

• Cr⁶⁺: ≤ 10 ppm

Particle Size Distribution

• D10: 1 – 2.5 μm

• D50 (Average): 4.2 – 4.65 μm

• D90: 8 – 11 μm

Applications

• Pigments: Used in paints, ceramics, inks, and glass as a stable, vibrant green pigment

• Stropping Compounds: Ideal for knife and blade polishing due to fine abrasive qualities

• High-Temperature Ceramics: Utilized for coloring and enhancing thermal durability

• Magnetic Materials: Acts as a precursor in the production of chromium dioxide (CrO₂)

• Optical Coatings: Provides coloration and durability in precision glass applications

• Corrosion-Resistant Coatings: Used in metal finishing and protective layers

Key Features

• High color stability under thermal and UV exposure

• Chemically inert with excellent resistance to oxidation

• Very low levels of Cr⁶⁺ (≤ 10 ppm) for safer handling

• Consistent fine particle size for even distribution in formulations

• Suitable for both industrial and technical-grade applications