Stainless Steel Crucibles & Lids

304 stainless steel handles sustained heat well but has a lower practical temperature ceiling than porcelain. For most routine ashing and ignition work below this range, steel is an excellent, durable choice; for very high-temperature furnace programmes, confirm the rated maximum before switching from porcelain.

Porcelain is chemically inert to almost everything except hydrofluoric acid; stainless steel can react with certain strong acids and halide-containing samples. If your procedure involves aggressive or acidic reagents, check compatibility before choosing steel over porcelain.

As with porcelain crucibles, leave at least half the crucible's volume empty once loaded, to prevent spillover during heating or swelling reactions. Standardise on one size across a class or lab for directly comparable gravimetric results.

A matching lid controls airflow and reduces sample loss during ignition, just as it does on a porcelain crucible. Confirm the lid diameter matches your crucible exactly rather than mixing sizes from different sets.

Choose porcelain for the highest temperature tolerance and maximum chemical inertness, particularly for gravimetric analysis and demanding furnace work. Choose stainless steel for everyday durability, resistance to chipping in a busy or high-traffic lab, and a lower cost of ownership over time where extreme temperatures and aggressive chemicals are not involved.

304 stainless steel resists rust well under normal use, but repeated exposure to moisture without thorough drying, or contact with certain chlorides, can eventually cause surface staining or pitting. Dry crucibles fully after cleaning and before storage to keep them in good condition long term.

Yes, they are designed for direct flame use in the same way as porcelain crucibles, supported in a pipe-clay triangle on a tripod stand. Always use crucible tongs to handle them once heated, since steel conducts and retains heat readily.

Steel is slightly heavier and can develop a thin oxide layer with repeated heating cycles, both of which can introduce small mass changes over time that matter for precise gravimetric work. For the most precise, repeatable mass-based analysis, porcelain remains the standard choice.

Once cooled, most residues lift with warm water and a soft brush or scouring pad, since steel tolerates more vigorous cleaning than glazed porcelain. For stubborn residue, a mild acid soak can help, but rinse thoroughly and dry completely afterwards to prevent staining.