Copper Chromite Black Spinel P.Bk.28 FU-GS611 For Glass Printing Ink

FU-GS611 Copper Chromite Black Spinel PBk 28 is a black inorganic pigment made by calcination of oxides of copper and chromium at high temperature. FU-GS611 Copper Chromite Black Spinel PBk 28 has uniform particle size distribution, high coverage and moderate blackness. Pigment Brown 28  has the characteristics of high temperature resistance, sun fast, UV resistance, weather resistance, acid and alkali resistance, corrosion resistance, easy dispersion, strong coloring power, covering strong, non-migration, non-penetrating color, non-toxic and so on.

Color Indicate：Pigment Black 28; C.I：77428
CAS NO.：68186-91-4
Chemical Formula：CuCr2O4
Appearance: Black powder
Crystal type: Spinel type
 

Specific Gravity(g/cm3) 4.6-5.4
Average Particle Size(µm) ≤1.5
Oil Absorption(g/100g) 15-25
PH 5.0-7.0
Heat Resistance ≥750℃
Light Fastness 8
Weather Fastness 5
Water Soluble Salts ≤0.3％
Sieve residue(325 mesh/45µm) ≤0.05％
Moisture ≤0.2％

Key Advantages of Copper Chromite Black Spinel (PBk 28) in Glass Inks:

Extreme Heat Stability: Withstands high glass-firing temperatures (typically up to ~850°C) without degradation or color shift.

Chemical & Weather Resistance: Highly inert, providing excellent durability against acids, alkalis, UV light, and weathering for long-lasting prints.

Intense, Jet-Black Color: Offers a deep, pure, and consistent black shade with strong tinting strength.

Lead-Free & Durable: A safer alternative to lead-based blacks, compliant with major regulations (e.g., RoHS), while ensuring scratch-resistant, permanent fusion with the glass.

Process Reliability: Copper Chromite Black Spinel Ensures stable performance and consistent results in high-temperature production cycles.

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