Sealed crucible

A sealed crucible, also commonly referred to as a volatile‑matter‑sealed crucible or a lidded, hermetically sealed crucible, is a standard, purpose‑built vessel used in coal analysis. It is a mandatory consumable component specified in the national standard GB/T 212 for coal industrial analysis. Its key design feature is the exceptionally precise fit between the crucible body and its lid, enabling near‑airtight sealing even under high‑temperature conditions. The overall structure is a conical shape with a stepped opening; the crucible rim incorporates a precisely machined locating ledge. When the lid is inverted and placed on the crucible, the gap between the lid and the body is extremely narrow, resulting in significantly superior sealing performance compared to conventional, standard crucibles. Model 20 mL: outer diameter 33 mm, height 42 mm, bottom diameter 19 mm. 25 mL: outer diameter 37 mm, height 46 mm, bottom diameter 22 mm. 30 mL: outer diameter 39.5 mm, height 52 mm, bottom diameter 24 mm.

Product introduction