• Deep, neutral black shade with high tinting strength • Excellent heat stability (typically 1000–1200°C, grade-dependent) • Outstanding UV and weather resistance for long-term outdoor use • High chemical resistance to acids, alkalis, and solvents • Non-bleeding and non-migrating in polymers and coatings • Only Cr³⁺ in a stable spinel lattice; no Cr(VI), RoHS / REACH compliant • Good dispersibility in PP, PE, ABS, PVC, PA and most coating binders • Suitable for high-shear extrusion, injection moulding, and powder coating processes FAQ – Copper Chrome Black Spinel PBk28 1. What is Copper Chrome Black Spinel (PBk28)? Copper Chrome Black Spinel (PBk28) is a Complex Inorganic Colored Pigment (CICP) based on a copper–chromium spinel structure (CuCr₂O₄). It provides a deep black shade with excellent heat, UV, and chemical resistance. 2. Is PBk28 free of hexavalent chromium (Cr(VI))? Yes. PBk28 contains only trivalent chromium (Cr³⁺) fixed in a stable spinel lattice and contains no Cr(VI). It is suitable for RoHS, REACH and EN71-3–compliant formulations. 3. Is PBk28 magnetic? Pure CuCr₂O₄ PBk28 is effectively non-magnetic. Some iron-modified grades may show weak magnetism but remain suitable for plastics, coatings and most sensitive applications. 4. What is the heat stability of PBk28? PBk28 typically offers thermal stability in the range of 1000–1200°C, depending on grade and formulation, making it suitable for powder coatings, ceramic firing and other high-temperature processes. 5. Where is PBk28 typically used? PBk28 is widely used in plastics, powder and liquid coatings, ceramics, glazes, porcelain, cement-based materials and outdoor architectural components that require long-term weather resistance. 6. Does PBk28 migrate or bleed in polymers? No. PBk28 is a mineral pigment and is non-bleeding and non-migrating, even in flexible polymers or under high-shear extrusion conditions. PBk26 vs PBk28 vs PBk29 – quick comparison • PBk28 (Copper Chrome Black Spinel): deep neutral black, excellent heat and weather stability, ideal for plastics and coatings. • PBk26 (Chrome Iron Black): slightly warmer black tone, iron-rich composition, used where a softer black or brownish undertone is acceptable. • PBk29 (Iron Chrome Brown): brown spinel pigment for earth-tone and brown shades; non-magnetic and used where brown colour with high durability is required.

• Plastics & polymers: PP, PE, ABS, PVC, PA, cable compounds, masterbatches, construction plastics • Coatings: powder coatings, architectural coatings, coil coatings, corrosion-resistant industrial coatings • Ceramics & enamel: tiles, sanitaryware, porcelain, glazes and enamels requiring high firing temperatures • Construction materials: cement and concrete coloration, roof tiles, facade elements, pavers • Automotive & transportation components requiring long-term UV and heat resistance • Other high-temperature, high-durability systems where organic black pigments are not stable enough