The normal glassy form of boric oxide has no definite melting point. It begins to soften at about 325°C (617°F) and subsequently flows above 450°C (842°F).
Boric oxide is a hygroscopic product. Avoid exposure to water or humidity, which can cause caking. If wetted, the project reacts exothermically, forming boric acid, so maintaining the integrity of the packaging is also essential.
Approximately 56.3 kg of boric oxide are the chemical equivalent of 100 kg of boric acid.
The reaction of boric oxide with water is highly exothermic.