Kiln Stable Color Pigments Powder

Specialist in High-Heat Calcined Pigments

Deqing Demi Pigment Technology Co., Ltd. manufactures kiln-stable inorganic powders that meet the rigorous standards of the heavy clay and ceramic industries. Our production process utilizes controlled-atmosphere kilns to ensure the purity of the oxide phase. We provide industrial users with pigments that offer predictable behavior in both fast-firing and traditional slow-firing cycles, ensuring that large-scale production runs maintain color uniformity across different kiln positions and firing batches.

Kiln-Fired Application Sectors

• Ceramic Roof Tiles: Integral coloring for clay-based roofing materials.
• Refractory Bricks: Pigmentation for high-temperature lining materials.
• Glass Enamels: Surface decoration for tempered glass and automotive glass.
• Porcelain Stoneware: Full-body coloration for high-density architectural tiles.

Kiln Stability Technical Data

Core Characteristics for Thermal Processing

• Phase Purity: Minimizes the presence of unstable hydrated oxides that cause gas bubbles.
• Inert Interaction: Does not act as a flux or significantly lower the melting point of the surrounding matrix.
• Crystal Hardness: Resistant to the mechanical stresses of dry-pressing and extrusion before firing.
• Low Volatility: Zero emission of organic compounds during the heating cycle.

• Q: Does the pigment affect the shrink rate of the clay?

  A: Because these pigments are fully calcined and inorganic, they have a minimal impact on the drying and firing shrinkage of the ceramic body when used at standard dosages.

• Q: Are these suitable for reducing atmospheres?

  A: Certain grades are specifically tested for stability in oxygen-starved kiln environments to prevent unwanted color shifts.

Thermal Profiling Services

Our production facility includes test kilns capable of replicating various industrial firing curves. We can provide a detailed report on how the pigment performs at specific temperature intervals.

Batch Uniformity: We utilize automated blending systems to ensure that the chemical composition and particle size distribution are identical across multi-ton shipments, which is critical for continuous kiln operations.

Quantifying Chromatic Shifts in Firing

Color science in kiln-stable applications focuses on the "Delta E" between the raw powder and the fired result. We use high-precision spectrophotometers to map the reflectance curves. By understanding the refractive index of the final fired state (glassy vs. crystalline), we calibrate our pigments to provide the highest possible chroma (C*) while maintaining the target lightness (L*). This data allows ceramic engineers to adjust their base formulations to achieve a perfect match with their design standards.