The unglazed stoneware mug on the right has 2.5% porosity (water absorption) at cone 6 (according to an SHAB test). It is stoneware, and it is strong and durable. But the fact that porosity can be measured demonstrates that water should be able to pass through it (as shown in this 24-hour test on a piece of paper). The left one has 1% porosity. While theoretically water still should be able to pass, bodies with this level of vitrification normally do not leak. The point: A non-crazing glaze is needed for water tightness for the body on the right. This is not a problem; bodies with far more porosity than this are routinely used in industry; if the inside glaze fits, they don’t leak.
| Troubles | Leaking of Fired Ceramics |
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