Porcelain pestles and mortars rvfm ch116054 in the laboratory a pestle and mortar is used to grind crush and mix substances into fine powders that can then dissolve or react quickly or can be strained or filtered more easily these porcelain pestles and mortars are robust and easy to clean and are glazed inside and outside except on the bottom of the mortar and the head of the pestle rvfm porcelain pestle and mortars 100mm