Crucible, Stainless Steel

Quick Answer: A stainless steel crucible is a metal crucible made of stainless steel, used for heating, drying, melting low-melting metals and other rough work in the laboratory or workshop where a porcelain crucible could crack or break.

Steel Instead of Porcelain

Porcelain is chemically inert but brittle: dropped, knocked or cooled too quickly, it cracks. Stainless steel does not. A steel crucible survives thermal shock and rough handling, which makes it useful for student work, field kits and melting soft metals such as tin or solder in metalwork and physics demonstrations. It conducts heat well, so its contents warm evenly and quickly.

Steel has limits of its own. Held at red heat for long periods it scales and discolours, so it is not suited to high-temperature ignitions to constant mass, where porcelain or platinum is used. It is attacked by hydrochloric acid and other chloride-rich solutions, and traces of metal can pass into the sample, which rules it out for trace-metal analysis. For drying, moisture determination, melting and general heating, these limits rarely matter.

Stainless crucibles are often sold with a lid, which reduces spattering and heat loss; whether a lid comes with this item, and its capacity, are not given in the listing. Where chemical inertness matters more than toughness, the squat form porcelain crucible is the alternative.

Specifications

Care & Handling

• Keep hydrochloric acid and chloride-rich solutions out of the crucible.
• Handle hot crucibles with tongs and set them down on a heat-resistant surface.
• Clean with detergent and a non-scratch pad, removing scale gently.
• Dry thoroughly after washing to avoid water spots and staining.

Applications

• Moisture determination of soils, grains or feeds by drying and reweighing.
• Melting tin or low-melting alloys for casting or cooling-curve experiments.
• Heating samples in student practicals where porcelain breakage is a concern.
• Holding samples in drying ovens.

Why Choose LabEquip

Physics and metalwork teachers, agricultural and soil labs running moisture tests, and labs that lose too many porcelain crucibles to breakage buy these steel crucibles. LabEquip lists them in General Lab Products; ask about lids and sizes through the contact page.

Frequently Asked Questions

When is a stainless steel crucible a better choice than porcelain?

When breakage is the main problem, as in student practicals, field work and melting soft metals, or for drying and moisture tests. Porcelain remains the right choice for high-temperature ignitions and chemically sensitive analysis.

Can a stainless steel crucible be heated in a Bunsen flame?

Yes. It heats quickly and evenly and does not crack from thermal shock, though long periods at bright red heat will scale and discolour the steel.

Which chemicals should not be used in it?

Avoid hydrochloric acid, other chloride-rich solutions and strongly reducing acids, which corrode stainless steel. Hot concentrated sulfuric acid is also better handled in porcelain.

Is a stainless crucible suitable for gravimetric analysis?

For moisture and drying tests at oven temperatures, yes. For ignitions at high temperature, the steel’s slow oxidation changes its mass, so porcelain or platinum crucibles are used instead.

Can molten metal be poured from it?

Low-melting metals such as tin and solder can be melted and poured using tongs that grip the crucible securely, with eye protection and a tray of dry sand beneath. Higher-melting metals need a furnace and refractory crucibles.

Why has my steel crucible changed colour?

Heating forms a thin oxide layer that shows as straw, blue or brown tints. It does not usually affect use for drying or melting, though heavy scaling at red heat slowly thins the metal.

Last Updated: September 2026