Chrome Ore Powder for Green Glass Bottle Coloring

I. Coloring Principle of Chrome Ore Powder

• Chrome ore powder contains chromite (FeCr₂O₄) and Cr₂O₃ (chromium trioxide).
• During high-temperature melting of glass bottles, Cr³⁺ enters the glass network, selectively absorbing blue-violet light and reflecting green light, producing emerald green, yellowish green, or olive green hues in the glass.

II. Physical and Chemical Indicators of Chrome Ore Powder for Glass Coloring

• Cr₂O₃ content: 40%–46%+ (higher content yields deeper green and higher price)
• • Cr₂O₃: ≥46%
  • SiO₂: ≤1.0%
  • FeO/Fe₂O₃: 26%–28%
  • Al₂O₃: ≤15.5%
  • CaO: ≤0.3%
  • MgO: ≤10%
    Our chrome ore powder raw material is sourced from South Africa:
• Conventional particle sizes for green glass bottle production: 200 mesh, 325 mesh, 400 mesh, 600 mesh, 800 mesh, 1200 mesh, 1600 mesh, 2500 mesh
• Dosage of chrome ore powder: 0.1%–2% (adjusted based on target color depth)
  • Light green: 0.1%–0.5%
  • Dark green / beer green: 0.8%–1.5%
  • Dark green / bottle green: 1.5%–2.0%
• • Bluish green: chrome ore + CuO (copper oxide)
  • Yellowish green: chrome ore + Fe₂O₃ (iron oxide)
  • Amber / brown: chrome ore + manganese / nickel / sulfur
    Color matching combinations:

IV. Advantages of Chrome Ore Powder as a Glass Bottle Colorant

1. Low cost: 30%–50% cheaper than pure chromium oxide green.
2. Stable color: UV-resistant, non-fading, and colorfast over long periods.
3. High functionality: Green glass blocks UV rays, protecting beer, beverages, and cosmetics.
4. Good compatibility: Fully compatible with soda-lime silicate glass (container glass).

V. Applicable Products

• Beer bottles, wine bottles, sauce bottles, olive oil bottles, pesticide bottles, green cosmetic bottles, etc.

VI. Purchasing Guidelines

• Cr₂O₃ ≥44%–46% (glass grade)
• SiO₂ ≤1.0%, low iron and low calcium content
• Particle size: 325 mesh / 400 mesh, moisture content < 0.5%