Overview
Chromic oxide (Cr2O3) is a stable, inorganic compound that occurs naturally as the rare mineral eskolaite. It is synthetically produced for industrial applications due to its exceptional thermal and chemical stability. As one of the principal oxides of chromium, it has been commercially significant since the 19th century. The compound's most notable characteristic is its intense green color, which makes it valuable as a pigment. Unlike many other chromium compounds, Cr2O3 is not toxic in its solid state, though precautions are necessary when handling fine powders to prevent respiratory exposure.
Physical and Chemical Properties
Chromic oxide demonstrates remarkable stability, with a melting point exceeding 2400°C and resistance to most acids and alkalis. Its crystalline structure belongs to the corundum (α-Al2O3) type, contributing to its hardness (8-9 on Mohs scale). The material shows semiconductor properties and changes electrical resistance under gas exposure. Unlike chromium(VI) compounds, Cr2O3 is not water-soluble and doesn't oxidize further, making it environmentally preferable for many applications. Its optical properties include high infrared reflectivity and excellent UV absorption, which are exploited in specialized coatings.
Main Applications
Approximately 50% of chromic oxide production is used in metallurgy as a component of refractory bricks for furnaces, owing to its high melting point. In pigments (30% of use), it provides durable green colors for ceramics, paints, and glasses that resist weathering and UV degradation. The compound serves as a polishing agent (known as 'green rouge') for stainless steel and optical components due to its optimal hardness. Emerging applications include catalytic converters, where it assists in hydrocarbon oxidation, and as a raw material for producing metallic chromium through aluminothermic reactions.
Safety and Storage
While Cr2O3 is considerably less hazardous than hexavalent chromium compounds, inhalation of dust particles may cause respiratory irritation. OSHA recommends a permissible exposure limit (PEL) of 0.5 mg/m³ for chromium(III) compounds as an 8-hour time-weighted average. Storage requires dry conditions to prevent caking, with containers sealed to minimize dust generation. Bulk quantities are typically packaged in 25-50 kg multilayer paper bags with polyethylene liners. Facilities should have proper ventilation systems and provide workers with NIOSH-approved particulate respirators for handling powders.
B2B Procurement Guide
Industrial buyers should specify purity requirements (standard grade 98%, high purity 99.5+%), particle size distribution (typically 1-10 microns for pigments, sub-micron for catalysts), and packaging preferences. Technical data sheets should confirm heavy metal content and loss on ignition values. Major production regions include South Africa, China, and Russia. For pigment applications, verify color consistency through CIE L*a*b* measurements. Consider suppliers with ISO 9001 certification and ask for batch analysis certificates. Spot prices fluctuate with chromium ore availability, so long-term contracts may offer stability for large-volume purchasers.
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