How to Make a Porcelain Vase: Step-by-Step Pottery Tutorial
TL;DR: To make a porcelain vase, wedge and center a soft, plastic body on the wheel, then pull up thin, even walls to create your desired form before trimming and firing. Success depends on maintaining consistent moisture levels and controlling speed during the throwing process to ensure structural integrity.
Creating a porcelain vase requires patience, precision, and a deep understanding of the material’s unique properties. Porcelain is known for its translucency and strength, but it is also notoriously difficult to work with because it contains a high percentage of quartz and feldspar. This composition means the clay does not have the same plasticity as stoneware or earthenware. Therefore, the process demands a gentler touch and a higher level of skill to prevent cracking or collapsing. Before you begin, ensure your workspace is clean and your wheel is functioning smoothly. You will need a block of porcelain clay, a sponge, a rib tool, a needle tool, and a scoring tool. The quality of your final piece is largely determined by how well you prepare the clay in the initial stages.
Preparing the Clay and Centering
The first critical step is wedging the porcelain clay. Unlike stoneware, porcelain does not need to be wedged for as long to remove air bubbles, but it must be worked enough to ensure uniform consistency. If the clay is too stiff, it will be difficult to center and pull. Knead the clay until it feels silky and uniform. Next, dampen the center of your wheel head and place the clay firmly in the middle. Use your hands to apply even pressure while spinning the wheel at a moderate speed. The goal is to align all the particles of the clay along the vertical axis. If the clay wobbles, it is off-center, which will result in an uneven vase. Take your time with this step; a well-centered piece of clay is the foundation of a successful porcelain vase.
Opening and Pulling the Walls
Once the clay is centered, use your thumb or a wooden tool to press down into the center, creating a hole. Do not go all the way through unless you are making a very thin-walled piece. After opening, you must pull up the walls. Porcelain is stiff, so you need to keep the clay moist with a sponge as you pull. Use a rib tool to compress the outer wall while your fingers support the inside. Pull the walls up in several stages, making the vase taller and thinner each time. This methodical approach prevents the walls from becoming too thin in one area and too thick in another. Remember that porcelain shrinks significantly during firing, so keep your walls slightly thicker than you think you need. A common mistake is making the walls too thin, which leads to collapse during the drying or glaze firing stages.
Trimming and Finishing
Allow the vase to dry to the leather-hard stage. This is when the clay is firm but still holds some moisture. You can now trim the foot of the vase. Place the vase on a bat and secure it to the wheel. Use a trimming loop to remove excess clay from the bottom, creating a clean, defined foot. This step is crucial for the aesthetic appeal of the porcelain vase, as the foot is often visible when the piece is on display. Once trimmed, smooth the surface with a sponge to remove any tool marks. Let the vase dry completely, which can take several days depending on the humidity. Any moisture left in the clay can cause an explosion in the kiln.
Firing and Glazing
Porcelain requires high temperatures to achieve its characteristic whiteness and strength. Bisque fire the vase at around 1000 degrees Celsius. After the bisque firing, apply your chosen glaze. Porcelain absorbs less glaze than other clays, so a thin, even coat is sufficient. Underglazes can be used for decoration, but the beauty of porcelain often lies in its raw, translucent quality. Glaze fire the vase at approximately 1300 degrees Celsius. The high heat will vitrify the clay, making it non-porous and water-resistant.
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