Red Special Shaped 69.8% SiO2 2.4g Clay Refractory Brick
Physical and chemical indexes:
|Thermal stability||130°c-20°c||No crackle after 3 times|
Chemical composition (%)
The mineral composition of Thermal Insulation Material Special
Shaped Refractory Brick is mainly kaolinite (Al2O3·2SiO2·2H2O) and
6%~7% impurities (oxides of potassium, sodium, calcium, titanium
The firing process of Thermal Insulation Material Special Shaped
Refractory Brick is mainly the process of continuous dehydration
and decomposition of kaolin to form mullite (3Al2O3·2SiO2)
The SiO2 and Al2O3 in the Thermal Insulation Material Special
Shaped Refractory Brick form eutectic low-melting silicate with
impurities during the firing process, which surrounds the mullite
Thermal Insulation Material Special Shaped Refractory Brick are
weakly acidic refractory products, which can resist the erosion of
acidic slag and acidic gas, and have a slightly weaker resistance
to alkaline substances. Clay bricks have good thermal properties
and are resistant to rapid cold and rapid heat
Competitive Price. Make the products competitive in your market.
Abundant Experience. Prevent cracks and twist in bricks.
Different Moulds. Save mould fees for you.
Strict Quality Control. Meet clients’ quality requirement.
Large stocks. Guarantee prompt delivery.
Professional Packing. Avoid damage and secure the goods in
1. as high acid resistance
2. Low water absorption
3. Oxidation at room temperature is not easy
5. High pressure resistance
6. Easy to clean
7. Strong acid and alkali corrosion resistance (parameter>99.8)
8. Convenient for installation
9. Uniform gas and liquid distribution
10. Reliable structure and chemical stability
11. Long service life, more than 3 years warranty
12. High Working temperature: 1650-1720C
13. Accurate size, small Tolerance
The Thermal Insulation Material Special Shaped Refractory Brick 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, the clay
bricks also contain nearly half of the low melting point amorphous
In the temperature range of 0~1000℃, the volume of Thermal
Insulation Material Special Shaped Refractory Brick 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 Thermal Insulation Material Special
Shaped Refractory Brick 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 Thermal Insulation Material Special Shaped
Refractory Brick gradually melt, and the particles are tightly
pressed against each other due to surface tension, resulting in
Production practice in China has proved that before crushing,
high-aluminum clinker is strictly sorted and classified, and stored
The use of bauxite clinker and combined clay fin grinding method
can improve product quality.