Fire Resistant SK34 Clay Refractory Brick 40MPA Yellow Color

Physical and chemical indexes:

Item Unit Index
Bulk density g/cm2 2.31-2.4
Water absorption % <0.5
Acid resistance % 99.8
Flexural strength Mpa 42
Crushing stength Mpa 120
Thermal stability 130°c-20°c No crackle after 3 times

Chemical composition (%)

SiO2 Al2O3 K2O Na2O CaO MgO Fe2O3
69.8 22.5 2.7 0.95 0.82 0.82 0.49


High Acid Resistance Fire Resistant SK34 SK36 SK38 Fire Clay High Alumina
Refractory Fire Brick for hot blast stove is comparable to that of silica
bricks, up to 1690~1730℃, but the softening temperature under load is more
than 200℃ lower than that of silica bricks.

In addition to the high refractory mullite crystals,High Acid Resistance Fire
Resistant SK34 SK36 SK38 Fire Clay High Alumina Refractory Fire Brick for hot
blast stove also contain nearly half of the low melting point amorphous glass
phase.
In the temperature range of 0~1000℃, the volume of High Acid Resistance Fire
Resistant SK34 SK36 SK38 Fire Clay High Alumina Refractory Fire Brick for hot
blast stove expands uniformly as the temperature rises.

The linear expansion curve is approximately a straight line, and the linear
expansion rate is 0.6%~0.7%, which is only about half of that of silica bricks.

When the temperature reaches 1200 ℃ and then continue to rise, its volume will
start to shrink from the maximum expansion.

The residual shrinkage of High Acid Resistance Fire Resistant SK34 SK36 SK38
Fire Clay High Alumina Refractory Fire Brick for hot blast stove leads to the
loosening of mortar joints in masonry, which is a major disadvantage of clay
bricks.

When the temperature exceeds 1200°C, the low melting point substances in the
High Acid Resistance Fire Resistant SK34 SK36 SK38 Fire Clay High Alumina
Refractory Fire Brick for hot blast stove gradually melt, and the particles are
tightly pressed against each other due to surface tension, resulting in volume
shrinkage.
Production practice in China has proved that before crushing, high-aluminum
clinker is strictly sorted and classified, and stored in tiers.
The use of bauxite clinker and combined clay fin grinding method can improve
product quality.

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