Definition: Kaolin clay is a fine, white clay mineral commonly used as a filler and coating agent in various materials. In the picture framing and art materials industry, kaolin clay is often applied during the buffering process to coat foam core, mat board, or paper, helping to neutralize acidity, smooth surfaces, and prepare substrates for artwork. Its alkaline properties contribute to archival quality by protecting paper-based materials from degradation over time.

Key Features

Neutralizing Agent: Helps neutralize acidic components in mat board and foam core to extend the lifespan of artwork.
Surface Smoothing: Creates a smooth, even coating on substrates, facilitating clean cuts and professional presentation.
Archival Quality: Contributes to the longevity of framing materials by providing pH buffering, important in conservation-grade applications.
Versatility: Used in art, cosmetics, coatings, and industrial applications due to its inert and non-reactive properties.

Best Practices

Ensure mat boards or foam core are evenly coated during production for consistent buffering performance.
Use kaolin clay in combination with other fillers, such as calcium carbonate, for enhanced smoothness and neutralization.
Store kaolin-coated boards in dry, temperature-stable conditions to prevent moisture absorption and potential warping.
When framing archival or fine art materials, confirm that all substrates are pH-neutral and kaolin-coated to maximize preservation.

Kaolin Clay

Kaolin Clay

Key Features

Best Practices

Related Terms