1. Different aluminum contents

The aluminum content of primary high alumina bricks is usually higher than that of secondary high alumina bricks. Generally speaking, the alumina content of first-level high-alumina bricks is about 75%-80%, while the alumina content of second-level high-alumina bricks is between 65%-75%. The higher alumina content makes the first-grade high-alumina bricks have better chemical stability and fire resistance in high-temperature environments.

2. Different refractoriness

In terms of refractoriness, first-level high alumina bricks can usually reach around 1790°C, while second-level high alumina bricks are around 1770°C. Therefore, the refractoriness of the second-level high alumina bricks is slightly lower than that of the first-level high alumina bricks.

3. Different load softening temperatures

In terms of load softening temperature, the load softening temperature of the first-level high alumina brick is about 1510°C, while the load softening temperature of the second-level high alumina brick is about 1460°C. Therefore, in comparison, the creep resistance of primary high alumina bricks is better than that of secondary high alumina bricks.

4. Different physical properties

There are also significant differences between first-level high alumina bricks and second-level high alumina bricks in terms of physical properties such as bulk density, apparent porosity, and normal temperature compressive strength. The volume density of first-level high alumina bricks is usually 2.5g/cm³, the apparent porosity is about 22%, and the normal temperature compressive strength is about 70Mpa; in comparison, the relevant values ​​of second-level high alumina bricks are 2.4g respectively. /cm³, 23% and 60Mpa. Therefore, first-grade high alumina bricks have more advantages in corrosion resistance and wear resistance.

5. Different prices

Price is also a big difference between the two. Since first-class high-alumina bricks have higher requirements in raw material selection and production technology, their costs are higher, and therefore the prices are also more expensive.

In summary, there are obvious differences between first-level high alumina bricks and second-level high alumina bricks in terms of aluminum content, refractoriness, load softening temperature, physical properties and price. In practical applications, companies should choose suitable high-alumina brick grades based on specific usage conditions and needs to ensure the best cost performance and usage effects.