Complex Inorganic color Pigments
Cobalt Blue (PB 28)

Cobalt Blue is an inorganic blue pigment primarily composed of a compound of cobalt oxide and aluminum oxide, known for its vivid and stable blue hue, along with excellent weather resistance, heat resistance, and chemical corrosion resistance. It features a uniform particle distribution, providing outstanding opacity and tinting strength, and maintains color stability and durability under UV exposure and various harsh conditions without fading or migrating. Additionally, it is non-toxic and environmentally friendly, making it a superior quality blue pigment.

Typical Properties
Product Code Masstone Tint (1:3) Color Index Name Pigment Chemical Mean Particle Size Oil Absorption(%) PH Heat Resistance
Blue-2501K
PB28/77346 Co-Al ~1.1 25-40 7-10 >500
Blue-2502K
PB28/77346 Co-Al ~0.6 25-40 7-10 >500
Blue-2503K
PB28/77346 Co-Al ~0.6 25-40 7-10 >500
Main Characteristics
  • Pigment Blue 28 (C.I. 77346)
  • Spinel structure
  • Reddish shade cobalt blue
  • Ease of dispersion
  • Excellent dimensional stability, Non-bleeding and Non-migratory
  • NIR reflectance (cool pigments)
  • Light fastness 8(1-8)
  • Weather fastness 5(1-5)
  • Acid fastness 5
  • Alkali fastness 5
  • Solvent fastness 5
  • Cement fastness 5
Application Scope
  • Suitable for all indoor and outdoor applications;
  • Recommended for combinations with high performance organic pigments in opaque formulations to achieve improved weather resistance;
  • Recommended for applications requiring excellent chemical and weathering resistance;
  • Suitable for Polymer PVC-P; PVC-U; PUR; LD-PE; HD-PE; PP; PS; SB; SAN; ABS/ASA; PMMA; PC; PA; PETP; CA/CAB; UP; Masterbatch; Engineering plastics; Wood-plastics; Powder Coatings; Water Based Coatings; Solvent Based Coatings; Stoving coatings; Fluorocarbon coatings; Automotive coatings; Camouflage coatings; Printing Inks; Construction materials; Cement; Mortar; Concrete; Roofing granules; Colored sands.
Total Solar Reflectance Curve (300-2500 nm)

Color Matching
  • ZPIGMENTS provides complete custom color matching services to help our customers develop new colors and finishes to meet specific application standards and/or unique customer needs.
  • ZPIGMENTS works closely with customers to understand their specific requirements to provide customized color solutions.
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