All size available 5ml to 300ml Ceramic Crucible Laboratory Equipment Porcelain Crucible with Cover LidIntroduce: 1. Item: crucible 2. Material: ceramic 3. Product features: 1) Heat resisting about 1200 degrees. 2) Suitable for melting of acidic materials such as K2S2 07. 3) Generally, NaOH, Na202, Na2CO3 and other alkaline substances should not be used for melting to avoid corrosion of crucible. And porcelain crucible cannot contact with hydrofluoric acid. 4) Wash by boiling hydrochloric acid. Note: permit a little error because of manual measurement.