Lightweight Mullite Bricks Insulation Fire Proof K23 K32 Insulating Firebricks

Description:

Mullite Refractory Bricks (also called mullite bricks) are made of synthetic fused mullite or sintered mullite, pressed by selected shaping processes, and fired in high temperature furnaces. Mullite refractory bricks offer high density, low porosity, good hot strength, and good slag resistance. Mullite bricks are preferred for high temperature, high load applications, such as at the hot end of regenerative chambers of glass melters, the superstructure of the furnace, and the arch of glass fiber melters, due to their excellent thermal properties, excellent strength at high temperature, great resistance to thermal shock, etc.

The mullite brick comprises the following chemical components in percentage by weight: 35 to 72 percent of Al₂O₃, 27 to 64 percent of SiO₂, and 1 to 1.2 percent of Fe₂O₃. Mullite bricks are high-alumina refractories with mullite (3 Al₂O₃·2SiO₂) as the main crystal phase. Generally, the alumina content is between 70% and 80%. Mullite Refractory bricks have high refractoriness, which can reach above 1790℃. The starting temperature of load softening is 1600～1700℃. It has the good thermal shock resistance with cold crushing strength of 70～260MPa. There are two types of mullite refractories: sintered mullite bricks and fused mullite bricks. If the Al₂O₃ content in refractory brick is more than 80%, we call it as corundum mullite brick. If there is ZrO₂ in the brick, we call it as Zircon Mullite Brick.

Mullite refractory bricks are widely used in glass furnaces, hot blast stove and etc.

Features of Mullite Refractory Bricks

• Low levels of iron and other      impurities

• High mechanical intensity

• High refractoriness, can      contact with the flame directly, suitable for various atmosphere

• High porosity, low volume      density, low thermal conductivity

• Good heat insulating      performance and energy-efficient

• Low creep rare at high      temperature,good thermal shock stability

• Chemical corrosion resistance

• Long service life

Specifications.

 Mullite refractory bricks should not be used for long-term use in high-alkaline slag and high water vapor content environments.

Dimensions  of mullite refractory bricks

l   230 x 114 x 64 mm 

l   230 x 114 x 76 mm 

l   Customized production for bricks with special dimension  is available 

Application

• Furnace roof of hot blast      stove

• Furnace stack and bottom      of blast furnace

• Regenerative chamber of      glass melting furnace

• Ceramic high temperature      furnace0