BRC0416141305-Series Gooch Crucibles High Form, w/ Fritted Disc SIBATA 1305-Series Gooch Crucibles, with fritted disc filters, meet ISO 4793 Specifications . Suitable for analytical work where precipitates are dried to a constant weight at 110°C. Also suitable for higher temperatures, in which case it is advisable to heat in an electric furnace. Crucibles should not be subjected to sudden temperature changes. In order to avoid strain, they should not be removed from the furnace until the temperature has dropped to 250°C.