Great precision is required in the making of teapots, for the clay contracts by about 15 to 20 % in the kiln, often cracking the handle, deforming the cap, or leaving the cap stuck to the body. The reject rate is higher with teapots than other items.
而一把好的茶壺，對精密度的要求相當高，因為高溫窯燒時，陶土遇火乾燥，會有百分之十五至二十的收縮度，常會造成壺把的拉裂，壺蓋也會產生變型或沾黏而無法開啟，損壞率比一般作品來得高。