TL;DR: Make a DIY porcelain vase by casting liquid porcelain slip in a plaster mold, then firing it in a kiln to vitrify the clay. This guide covers mold prep, pouring, finishing, and glazing for a durable, food-safe porcelain vase.
Step 1: Gather Materials
You will need porcelain slip (casting clay), a two-part plaster mold, a bucket, a stirring stick, a fettling knife, a sponge, and a kiln. Choose a high-fire porcelain slip rated cone 6–10 for strength and translucency. Work in a well-ventilated space.
If you want to dig deeper, check out our guide on Do Porcelain Vases Affect Health? 5 Safe Tips.
Step 2: Prepare the Mold
Ensure the plaster mold is bone dry. Secure the mold halves with rubber bands. Mix porcelain slip until smooth like heavy cream. Let it rest 10 minutes to remove air bubbles.
Step 3: Pour and Cast
Pour slip into the mold to the top. Wait 10–15 minutes for a 1/4-inch wall to form. Pour out excess slip back into the bucket. Let the cast set until it pulls away from the mold (30–60 minutes). Open the mold and remove the vase gently.
Step 4: Clean and Dry
Trim the seam lines with a fettling knife. Smooth edges with a damp sponge. Let the vase dry slowly under plastic for 24 hours, then air-dry completely for 2–3 days. Bone-dry porcelain is fragile—handle with care.
Step 5: Bisque Fire
Fire the vase to cone 04 (about 1945°F). This removes water and organic matter, turning the porcelain into bisque. Let the kiln cool completely before opening.
Step 6: Glaze and Glaze Fire
Apply porcelain glaze by dipping or brushing. Wipe the bottom clean. Fire to cone 6 (2232°F) for a vitrified, waterproof finish. Cool slowly to avoid thermal shock.
Tips
Use distilled water for slip consistency. Avoid drafts during drying to prevent cracks. Test glaze on a small tile first. Porcelain shrinks about 15%—plan for final size.
FAQ
Q: Can I make a porcelain vase without a kiln?
A: No—porcelain requires high-fire kiln temperatures to vitrify. Air-dry clay is not porcelain.
Q: How thick should the vase walls be?
A: Aim for 1/4 inch (6 mm). Thinner walls risk cracking; thicker walls may not fully vitrify.
Q: Is DIY porcelain food-safe?
A: Only if you use a food-safe glaze and fire to the glaze manufacturer’s recommended cone. Otherwise, use it for dry displays only.
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