Overview
Kaolin for ink is a refined, high-purity form of kaolin clay specifically processed for use in printing inks. Its unique particle morphology and surface chemistry make it ideal for enhancing ink performance, particularly in terms of opacity, gloss, and rheological stability. The material is widely used in both water-based and solvent-based ink systems. Unlike general-purpose kaolin, ink-grade kaolin undergoes additional beneficiation steps to remove impurities like iron and titanium oxides, which could affect color quality. Its controlled particle size distribution ensures smooth ink flow and reduces wear on printing equipment.
Physical and Chemical Properties
Ink-grade kaolin exhibits a platy particle structure with a typical diameter of 0.2–2 microns and a thickness of 0.05–0.2 microns. This morphology contributes to its excellent light-scattering properties, which improve ink opacity. The material has a pH of 6.5–7.5 in water suspension and a brightness of 85–92% (ISO standard). Chemically, kaolin is inert and does not react with ink solvents or binders. Its low conductivity (<100 μS/cm) makes it suitable for electrostatic printing applications. The material's oil absorption value ranges from 30–50 g/100g, influencing ink viscosity and pigment loading capacity.
Main Applications
The primary use of kaolin for ink is in offset printing, where it constitutes 10–30% of the ink formulation. It improves print sharpness by preventing ink penetration into paper fibers. In gravure inks, its plate-like particles align parallel to the substrate, enhancing gloss and reducing bronzing effects. Flexographic inks benefit from kaolin's rheological control, which maintains stable viscosity during high-speed printing. Specialty applications include security inks, where kaolin's unique particle signature aids in anti-counterfeiting measures. The material is also used as a matting agent in certain ink systems to reduce surface reflectivity.
Safety and Storage
Kaolin for ink is classified as non-hazardous under GHS standards. However, prolonged exposure to airborne dust may cause respiratory irritation. Appropriate PPE (dust masks, eye protection) should be used when handling bulk quantities. The material is not flammable or reactive. For storage, kaolin should be kept in original packaging or sealed containers to prevent moisture absorption, which can lead to clumping. Ideal storage conditions are below 30°C with relative humidity under 65%. Bulk bags should be stacked no more than three high to prevent compaction and particle size segregation.
B2B Procurement Guide
When procuring kaolin for ink applications, prioritize suppliers who provide detailed technical data sheets including particle size distribution (PSD), brightness, and viscosity impact test results. Request samples for lab testing with your specific ink formulation to evaluate compatibility. Key specifications to verify include: iron oxide content (<0.5% for premium grades), residue on 325 mesh sieve (<0.01%), and Brookfield viscosity at 70% solids. Consider suppliers with ISO 9001 certification and ask about their quality control processes for batch-to-batch consistency. For large orders, negotiate pricing based on annual volume commitments.
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