TL;DR: To make a porcelain vase, you slip-cast or hand-throw porcelain clay, bisque fire it, glaze it, then high-fire it at cone 10 for a translucent, durable finish. This guide covers the essential steps, from clay prep to final firing, for a flawless porcelain vase.
Step 1: Prepare Your Porcelain Clay
Porcelain is a finicky clay with high shrinkage and low plasticity. Wedge it thoroughly to remove air pockets, then let it rest for 24 hours in a damp box. Work on a clean, non-porous surface.
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Step 2: Form the Vase
For hand-throwing, center the clay on a potter’s wheel and pull walls to 3–5 mm thickness. For slip-casting, pour porcelain slip into a plaster mold, wait 10–15 minutes for a wall to form, then drain excess slip. Aim for a symmetrical, even shape.
Step 3: Trim and Smooth
Once leather-hard, trim the base and refine the neck. Use a damp sponge to smooth seams and rim. Porcelain shows every fingerprint, so handle with care.
Step 4: Bisque Fire
Allow the vase to dry completely, then bisque fire to cone 06 (about 1000°C). This removes water and organic matter without melting the clay.
Step 5: Glaze and High-Fire
Apply a porcelain-appropriate glaze—celadon, clear, or copper red—by dipping or spraying. Wipe the foot clean. High-fire to cone 10 (1300°C) in reduction or oxidation. Slow-cool for 2 hours to prevent crazing.
Tips for Success
Use a kiln shelf with kiln wash to avoid sticking. Test glazes on small tiles first. Porcelain warps easily, so support tall necks with wadding. Never open the kiln above 200°C.
FAQ
Q: Can I use stoneware glaze on a porcelain vase?
A: Yes, but test first—porcelain’s tight body can cause glaze fit issues like shivering. Choose glazes formulated for high-fire porcelain.
Q: Why did my porcelain vase crack during firing?
A: Likely uneven wall thickness or firing too fast. Dry slowly, bisque fire gently, and ramp the high-fire at 100°C per hour up to 600°C.
Q: How do I clean a finished porcelain vase?
A: Hand wash with mild soap and warm water. Avoid abrasive scrubbers or thermal shock—never pour boiling water into a cold vase.
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