Sintered Funnel (glass)

Combustion Boats are used in laboratories for chemical analysis. … The surface of porcelain combustion boats are glazed all over with the exception of outside bottom. The bottom of a combustion boat is generally flat that allows it to firmly placed on a planar surface.

A glass stirring rod, glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals and liquids for laboratory purposes. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw, with rounded ends.