Nonvitreous china Nonvitreous china is a po- rous ceramic that requires glazing to prevent any water absorption.This accounts for the slight difference between otherwise identical plumbing fix- tures. Because vitreous china is nonporous, it has a very high shrinkage rate when fired in a kiln. Vitreous china is also an extremely strong material. The exterior glazing provides a nice finish that is readily cleaned. While vitreous china plumbing fixture surfaces are glazed, the inside waterways are not. Un- like other ceramic materials, vitreous china will not absorb water on surfaces that are not glazed.
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