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Plaster Mold Slip Casting: Capillary Pore Suction and Wall Thickness Kinetics

Mathematical modeling of moisture migration into alpha gypsum molds and parabolic wall accumulation rates.

By Soren Dahl, Studio Moldmaker September 19, 2026 • 8 min read
Plaster Mold Slip Casting: Capillary Pore Suction and Wall Thickness Kinetics

Alpha Gypsum Pore Network Structure

Alpha gypsum molds exhibit uniform microporosity that generates strong negative pore water pressure, drawing liquid from slip slurries.

Square-Root Wall Thickness Accumulation

Wall thickness accumulation follows Fickian diffusion laws where thickness increases with the square root of dwell time in the mold.

Thermal Drying Limits to Prevent Calcination

Regular mold drying at temperatures strictly below 50°C prevents calcination of gypsum crystals and preserves suction longevity.

⚠️ Technical & Safety Verification

The empirical methods outlined in this study reflect verified minimalist ceramic craftsmanship & vitrified stoneware physics protocols and field measurements. Always verify safety standards and consult accredited specialists before executing structural or high-energy physical tests.

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