ceramicsslip

Ceramic slip, commonly just slip, is a liquid suspension of clay in water used in ceramic practice. It consists primarily of finely divided ceramic clay particles dispersed in water, often with additives to adjust viscosity and stability. Slip is formulated to be flowable for casting or workable for decoration.

In slip casting, slip is poured into plaster molds; the plaster absorbs water, causing a thin layer of solid clay to form on the mold interior, which dries and can be released as a hollow form. Slip can also be used for decorative techniques such as slip trailing and joinery in assembling parts.

Preparation and additives: Slip composition varies by purpose. Common clays include kaolinite and ball clay, sometimes supplemented with bentonite for plasticity. Deflocculants such as sodium silicate or sodium carbonate reduce water demand, enabling high solids slips. pH, temperature, and aging affect flow and stability.

Drying and firing: After casting or decoration, slip-coated pieces dry to leather hard or bone dry, then are bisque fired and glazed as part of standard ceramic processing. Slip compatibility with glazes and clay bodies is important to avoid defects.

Safety and disposal: Handling slip involves exposure to fine clay particles and silica; use ventilation and protective equipment as needed. Slips and slurry waste should be disposed of according to local regulations, and reclaimed via filtration and dewatering when feasible.