Double-layer crucible

The industry standard for coal analysis using a double-layer crucible is called the “double‑lid volatile‑matter crucible,” also known as the “double‑cover crucible.” It is a specialized high‑temperature consumable used in coal quality industrial analysis and graphite testing. Its defining feature is a split, double‑layer sealed structure, which clearly distinguishes it from conventional single‑lid crucibles. Basic Structural Features The assembly consists of three independent components: the crucible body, the inner small lid, and the outer large lid, forming a complete double‑layer sealing system: 1. Crucible Body: A standard conical chamber with a stepped upper opening, matching the basic external shape of the national‑standard volatile‑matter crucible, ensuring stable placement within the furnace. 2. Inner Lid: Slightly smaller in size, it fits snugly into the crucible’s rim, directly covering the sample to prevent volatiles from escaping. 3. Outer Lid: A larger protective cover that snaps onto the stepped surface on the exterior of the crucible, creating a secondary seal and insulating layer. Model Specifications: Outer diameter: 31 mm; Height: 43 mm; Bottom diameter: 20 mm.

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