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Kela Transparent Cobalt Blue Pigment – High-End Cobalt Aluminate (CoAl₂O₄, PB28)
PB528NT
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Introduction
Kela New Materials specializes in Transparent sub-micron Cobalt Blue—a high-purity cobalt aluminate spinel (CoAl₂O₄, PB28) engineered for advanced industries where conventional cobalt blue pigments cannot meet performance requirements. With true sub-micron-scale particle control, exceptional thermal stability, and a clean, vivid cobalt-blue tone, our transparent cobalt blue delivers superior optical, thermal, and chemical performance across cutting-edge applications. At the heart of our material is an inverse spinel crystal structure that ensures: • Transparent or semi-transparent blue color in inks, coatings, ceramics, and glass • Exceptional heat resistance (up to 1000–1300°C) • High UV and weathering stability • Low ionic migration and ultra-low impurities • Excellent dispersion in polymers, inks, and ceramic matrices • Environmentally safe, non-toxic, non-leaching composition
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Product Parameter
Product Model Nano cobalt blue
ColorBlue
Pigment Index Number PB28
CAS number 1345-16-0
Chemical formula Co/Al
Crystal phase structure Spinel type
Density g/cm3 /
pH value 7.7~7.8
Oil absorption (g/100g)45
Fineness μm 30nm
Heat resistance ℃ ≤1000℃
Lightfastness8
Acid resistance5
Alkali resistance5
Product feature
Cobalt Blue also provides special near-infrared (NIR) shielding properties, making it suitable not only for conventional coatings, inks, plastics, and construction materials but also for military anti-counterfeit coatings, security markings, and special thermal-insulation materials. In addition to standard cobalt aluminate pigments, Kela New Materials supplies transparent sub-micron-grade Cobalt Blue, engineered for high-end applications including advanced abrasives, premium 3C electronic inks, LED and optoelectronic materials, and other precision industries. This transparent cobalt blue represents a breakthrough technology in China, filling a long-standing gap in the domestic specialty pigment market.

FAQ

What is Kela Transparent Cobalt Blue PB528NT?
It is a high-purity cobalt aluminate spinel pigment engineered for transparent or semi-transparent blue coloration in high-end coatings, inks, plastics, ceramics, and security materials.

What makes PB528NT different from ordinary cobalt blue pigments?
PB528NT uses sub-micron-scale spinel technology to achieve superior transparency, thermal stability, and chromatic purity, making it suitable for premium and precision applications.

Does PB528NT offer near-infrared (NIR) shielding?
Yes. The pigment provides functional NIR shielding, making it suitable for anti-counterfeiting, security marking, and specialty industrial coatings.

Where is transparent cobalt blue typically used?
High-end automotive coatings, transparent plastics, ceramic glazes, printing inks, industrial security coatings, and decorative finishes requiring both clarity and stability.

Is PB528NT environmentally safe?
Yes. As an inorganic spinel pigment, it is thermally stable, chemically inert, and compliant with international environmental and safety standards.
Application area
At the heart of our material is an inverse spinel crystal structure that ensures: • Transparent or semi-transparent blue color in inks, coatings, ceramics, and glass • Exceptional heat resistance (up to 1000–1300°C) • High UV and weathering stability • Low ionic migration and ultra-low impurities • Excellent dispersion in polymers, inks, and ceramic matrices • Environmentally safe, non-toxic, non-leaching composition