Is silica brick acidic or basic?

Silica brick is an acidic refractory material. It has a high silica (SiO2) content, which results in a low basic oxide content such as CaO and MgO. Silica has a neutral pH of 7, but when it is combined with other oxides to form silica brick, the resulting material is considered acidic due to the low basic oxide content.

Acidic refractories, like silica brick, are highly resistant to acidic environments but may react with basic materials or alkalis. In contrast, basic refractories, like magnesia bricks, have a high basic oxide content and are highly resistant to basic materials but may react with acidic materials.

It is important to consider the chemical composition of refractory materials when selecting them for specific applications to ensure that they can withstand the intended environment without degrading or reacting with other materials.

Overall, silica bricks are a versatile and reliable refractory material that can be used in a wide range of high-temperature applications where good thermal stability, low thermal conductivity, and excellent chemical and mechanical resistance are required.