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Boric Oxide: Boric Acid Heated Slowly Past 300 °C
Materialscientist (talk) (Wikimedia Commons) · CC BY-SA 3.0
Charlie

Created by

Charlie

14. October 2026DE
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Boric Oxide: Boric Acid Heated Slowly Past 300 °C

Boric oxide, a main part of borosilicate glass, is boric acid with its water driven off. Heated, boric acid gives off steam at about 170 °C and turns to metaboric acid; above 300 °C it loses the rest and leaves a clear glassy oxide. Heat it slowly, or it froths and gums. The picture: boron trioxide in a vial.
Intermediate
A day

Instructions

1

First heat

Weigh the boric acid into an iron crucible and warm it gently to about 170 °C, checked with the pyrometer, stirring, while it gives off steam.

Materials for this step:

Boric AcidBoric Acid200 g

Tools needed:

Balance ScaleBalance Scale
Iron CrucibleIron Crucible
Charcoal FurnaceCharcoal Furnace
CharcoalCharcoal
PyrometerPyrometer
Iron RodIron Rod
Welding GlovesWelding Gloves
Safety GlassesSafety Glasses
2

Over 300 °C

Raise the heat slowly above 300 °C. More steam comes off; go slowly so it does not froth up and gum. Hold it until no more steam rises and it settles to a clear glass.

Tools needed:

Charcoal FurnaceCharcoal Furnace
PyrometerPyrometer
Iron RodIron Rod
Crucible TongsCrucible Tongs
Welding GlovesWelding Gloves
Safety GlassesSafety Glasses
3

Crush and store

Let it cool, break the glassy cake out, crush it to powder, weigh it and keep it in a closed jar (ours).

Tools needed:

Mortar and PestleMortar and Pestle
Balance ScaleBalance Scale
Glass JarGlass Jar
Dust MaskDust Mask
4

Oxide from your acid

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Materials

1

Tools Required

12

This blueprint makes

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Boric Oxide

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