TL;DR: Making your own porcelain vase involves casting or hand-building high-fired porcelain clay, then bisque-firing, glazing, and glaze-firing it in a kiln. This guide walks you through preparing the clay, forming the vase, firing it twice, and finishing it for a durable, watertight result.
Step 1: Gather Materials and Prepare Your Workspace
You will need porcelain clay (often called “porcelain body”), a plaster casting mold or pottery wheel, a kiln capable of reaching 2,300–2,400°F (1,260–1,315°C), glaze, and basic tools like a sponge, rib, and needle tool. Work in a dust-controlled area, as porcelain contains fine silica particles. Wear a respirator when mixing dry clay and keep the workspace damp to minimize airborne dust.
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Step 2: Form the Vase Shape
For a beginner, slip casting into a plaster mold is the most reliable method. Pour porcelain slip into the mold, wait 10–20 minutes for a wall to form, then pour out the excess. Let the cast vase firm up until it holds its shape, then remove it from the mold. If you prefer wheel throwing, center the porcelain clay, open the center, and pull the walls upward into a vase profile. Porcelain is softer and more plastic than stoneware, so use gentle, steady pressure and keep your hands wet.
Step 3: Refine and Dry the Vase
Trim the base with a wooden rib or loop tool while the clay is leather-hard. Smooth the rim with a damp sponge and clean any seams from the mold. Allow the vase to dry slowly under a plastic sheet for 3–7 days to prevent cracking. Porcelain is prone to warping, so avoid direct sunlight or forced heat during drying.
Step 4: Bisque Fire
Place the bone-dry vase in the kiln and fire to cone 06–04 (about 1,830–1,940°F). This bisque firing hardens the clay and burns out organic matter. Let the kiln cool completely before opening—porcelain can crack if cooled too quickly.
Step 5: Glaze and Glaze Fire
Dip, pour, or brush glaze over the bisqued vase. Wipe the foot ring clean so glaze does not fuse the vase to the kiln shelf. Fire to cone 6–10 (2,200–2,380°F) depending on your clay and glaze. This high-temperature firing vitrifies the porcelain, making it non-porous and watertight.
Step 6: Finish and Inspect
Once cool, check for sharp spots on the foot and sand them with a diamond pad. Fill the vase with water to test for leaks. A well-fired porcelain vase should hold water without sweating. Clean with mild soap and avoid thermal shock—never pour boiling water into a cold porcelain vase.
Tips
Keep porcelain clay covered to prevent drying out. Use a kiln shelf wash or stilts to protect the shelf. Test your glaze on a small tile before applying it to the vase. Always fire slowly during the first 1,000°F to avoid cracking.
FAQ
Q: Can I make a porcelain vase without a kiln?
A: No. Porcelain requires high-temperature firing to vitrify; air-dry clay or polymer clay will not produce a true porcelain vase.
Q: Why did my porcelain vase crack during firing?
A: Cracking usually comes from uneven drying, trapped air pockets, or firing too fast. Dry the vase slowly and increase kiln temperature gradually.
Q: Is porcelain vase making safe for beginners?
A: Yes, if you use proper dust protection and follow kiln safety. Start with slip casting or small wheel-thrown forms to build confidence.
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