Pack of six wide form porcelain crucibles with 250ml capacity. Crucibles are 60mm tall with a 102mm top outside diameter. Covers are included. Excellent resistance to acids and alkalies, not including hydrofluoric acid. Autoclavable and glazed inside and out, except for outside bottom and rim. Designed to withstand temperatures up to 1150°C; to prevent thermal stress cracks, temperature change rate should no exceed 200°C per hour.