Looking for refractory bricks in Kenya? Fire brick or refractory brick is a special type of brick with high alumina content to enable is withstand high temperatures. They are used in the linings of kilns, furnaces, pizza ovens, fireplaces among other places. Firebricks are made of fireclay and then burnt in high temperatures to ensure they maintain consistency.
In Kenya there are two main types of fire bricks (refractory bricks). They are classified according to their alumina content which determines the level of temperature they can withstand. These are:
- 40% alumina content refractory bricks
- 70% alumina content refractory bricks
The 40% alumina content firebricks are the most popular in the Kenya and east Africa due to their wide applications. They have a temperature rating of 13700C thus suitable in wide applications such as furnaces, combustions chambers, light duty kilns, pizza ovens, fire places among other applications. The standard size of the 40% alumna fire bricks in the country is 230mm by 115mm by 75mm and weighs approximately 4.2 kgs. Their prices are also low and have a wide availability. Contact us today for your orders via +254 722 209 507.
On the other hand, 70% alumina content fire bricks are used in high temperature applications. In Kenya our 70% alumina fire bricks temperature rating is 1785oC suitable for applications such as blast furnaces, industrial kilns and other high temperature applications. The standard size of the 70% alumna fire bricks in the country is 230mm by 115mm by 75mm and weighs approximately 5.3 kg and are yellowish in color.
Perforated fire bricks are special types of refractory bricks that are used in specialized applications. They chemical and thermodynamic qualities are similar to the regular refractory bricks, only that these bricks have holes that in them. They are used in specialized such as smokeless furnaces, boiler houses among other applications.
Sillimanite Bricks vs Bauxite Bricks
Sillimanite bricks are refractory bricks made from sillimanite as the base mineral while the bauxite refractory use bauxite as the base mineral. The main purpose of the sillimanite and bauxite rocks is to provide the alumina and silica components which are important in making the bricks get the refractoriness that is required.
Using Fire Bricks in Construction
When using fire bricks in construction it is important to note that refractory cement has to be used to ensure that the feature/building has the right thermodynamic properties. Refractory cements have the same heat resistant properties just like the fire bricks. In Kenya there are several types of refractory cements such as HT castable cement, Maxheat K high alumina castable cement, fire clay, Blakite cement, Fondu Cement and also fire clay cement.
Firebricks are the most common form of dense refractories. They are usually made from hydrated aluminium silicates and small amounts of pother elements. They are very versatile and low cost. The firebricks with high alumina contents are suitable in applications that have high temperatures. Firebricks with 99% alumina content are referred to as corundum and mainly used in process with over 1500°C such as glassmaking, pouring steel, incinerations, ash melting and super alloys moulds casting.
Zirconium silicate is the principal ingredient of zircon refractories which are extremely strong up to temperatures over 1750°C. They are used to build furnaces and kilns, to make crucibles in the metallurgical industries because they do not react with liquid metals and in glass furnaces because they are not wetted by the molten glass.
Why Our Firebricks are the Most Preferred in Kenya
- Low thermal conductivity
- Excellent acid and base slagging resistance
- High refractoriness
- Excellent thermal shock resistance
- Excellent mechanical strength
- Good spalling resistance and wear resistance.
- Good corrosion resistance.
- High-temperature creep rate is quite low.
- Good volume stability at high temperature.
- Low bulk density, low thermal conductivity, good thermal insulation performance.