The CoorsTek Porcelain Gooch Crucibles are glazed with a perforated bottom for filtration of particles greater than 3/64" diameter. Except for the outside bottom surface and rim, they are glazed inside and out. They also can feature a perforated bottom and two wall holes for suspending in extraction apparatus. They are used for total suspended solids determination. Covers are sold separately.
Porcelain Gooch crucibles are fully glazed except for bottom and rim