Magnesia-carbon brick must have the following five characteristics to be beneficial to the glass melting process:

1. The fire resistance must be higher than the melting temperature of glass;

2. Try to cause glass defects such as stones, bubbles, nodules, streaks, etc. in the glass melt;

3. It should be dissolved eroded as much as possible, so that the melting furnace has a long service life, it is uniformly dissolved when dissolved, should be damaged in advance in a certain part;

4. Can be supplemented by quality quantity at any time;

5, the price is reasonable under the conditions that meet the quality requirements.

The goal of kiln building is to find refractory bricks that are closest to the above requirements.

Various oxides contained in refractory bricks can be dissolved in glass melts. It is necessary to find such refractory bricks, which are particularly insoluble slow to dissolve in glass melts, have such a structure, that is, refractory oxide The main part is protected inside the structure of the brick, so that those parts dissolved detached the refractory material are well dissolved in the glass sink to the bottom of the melting pool without causing glass defects.

In general, the most aggressive of glass compositions are alkali, alkaline earth, lead oxide, glass-forming bulking compounds. However, it needs special explanation:

Acidic components in glass such as SIO2, SO2, V2O3, B2O3, P2O5, etc. have an erosion effect on alkaline refractory bricks, while alkaline substances such as alkali alkaline earth have an erosion effect on refractory materials containing SIO2.