# High temperature bath chemicals

I have an electric mantle that I want to bathe reaction vessels at temperatures up to $\mathrm{750^{\circ}C}$. Obviously that rules out oils. What substances are used as bath media at such temperatures?

I was thinking of using lead or Rose's alloy, but wondering if there are more standard high-temperature bath chemicals? I suppose an ideal one would be both inert to lab steel, glass, and a standard atmosphere, and liquid down to room temperature.

• What about sand? – Todd Minehardt Feb 13 '16 at 16:20
• @ToddMinehardt You did beat me by seconds :D. Sand is an excellent option, both in terms of good heat transfer and lab safety. – Klaus-Dieter Warzecha Feb 13 '16 at 16:22
• @KlausWarzecha and Todd - Good suggestion. The reason I was thinking of liquids is that the electric mantle doesn't apply heat very evenly, but natural convection in a liquid would maintain even temperature. – feetwet Feb 13 '16 at 16:28
• Gallium may be nice – Mithoron Feb 13 '16 at 16:32
• @feetwet And gallium would probably also steadily form oxides at any air-exposed surface; not so good for long experiments. – hBy2Py Feb 13 '16 at 22:51