Our fire assay crucibles are high-quality and are suitable for multi-use. They have highly consistent dimensional tolerances and mechanical strength that makes manual and automatic handling very safe and efficient. All crucibles are uniform in shape to better accommodate handling equipment and tumbler mixers. Sizes available: 15g, 20g, 30g, 40g, 45g, 50g, and larger.For Continental crucibles, our standard range offering, these crucibles will last 4-5 fusions (depending on ore type and flux formulation).