Supply Ceramic insulating fire bricks

Ceramic insulating fire bricks used in lining furnaces,kilns,fireboxes and fire places are blocks of refractory ceramic material

 Ceramic insulating fire bricks

    -low thermal capacity
    -low heat conductivity
    -low ferric oxide content
    -high strength

This kind of product is evenly distributed with small porosity, and could reach high temperature refractoriness as well as ensure the apparent porosity. HML series insulating fire brick is suitable to be used in environment where the temperature varies between 1300 and 1550. It is divided into 4 grades according to classification temperature. Because HML series insulating fire brick possesses features of low thermal capacity, low heat conductivity, high strength, etc, it can reduce heat absorption, lower energy consumption, and shorten the working period.

 

PXZT ceramic insulating fire bricks are designed mainly to withstand high heat, but should also usually have a low thermal conductivity to save energy. Usually dense firebricks are used in applications with extreme mechanical, chemical, or thermal stresses, such as the inside of a wood-fired kiln or a furnace, which is subject to abrasion from wood, fluxing from ash or slag, and high temperatures. Dense fire bricks have a high thermal mass which is sometimes a useful property in that they will retain heat eg in a pizza oven after the fire has been taken out. Fire bricks are made by firing a clay based composition in the kiln until it is partly vitrified, and for special purposes may also be glazed. Fire bricks usually contain 30-40%  alumina and the primary raw material is usually chamotte with other materials. The maximum service temperature increases with increasing alumina content and bricks can be obtained with an alumina content of 80% and above.

They are weaker, but they are much lighter, easier to form, and insulate far better than dense bricks. In this case they have a low thermal mass and so cannot be used to store heat. Insulation bricks have a better thermal shock resistance than dense firebricks but the main disadvantage is their low strength. The insulation property of these bricks usually comes from perlite or vermiculite.

Item	Mullite brick	Re-sintered fusion mullite brick	Mullite corundum brick	Corundum mullite brick	High purity corundum brick
	MZ-70	SDM-75	MGZ-80	GM-88	GGZ-99
Max. service temperature,oC	1600	1650	1700	1750	1800
Al2O3, % ≥	70	75	80	88	99
SiO2, % ≤	25	23	18	8	0.2
Fe2O3, % ≤	0.5	0.5	0.5	0.3	0.15
Bulk density,≥,g/cm3	2.55	2.65	2.70	2.9	3.15
Apparent porosity, % ≤	17	17	19	19	19
CCS, MPa ≥	90	100	80	70	70
Refractoriness under loadoC,≥(0.2MPa,0.6%)	1630	1700	1700	1700	1700
Application	Used in upper lining, paving part and cover board of glass tank; also used as linings of other industry kilns such as carbon black reactor, etc.	Used as hat block and last block in upper part of glass tank, also used in linings of other hot-work devices	Used in upper lining, paving part and cover board of glass tank; also used as linings of other industry kilns such as carbon black reactor,etc.	Used as lining materials for various high temperature kilns such as hot blast stove and EAF, etc.	Used as lining materials in petrochemical kilns such as compound ammonia gasifier, decomposing kiln, gas generator, carbon black reactor, also used in kilns in refractory and metallurgy industries

PXZT fire bricks can be made according to customer's requirement.

Our company(PXZT) supplies various Refractory material, such as 

1)Fire Bricks
2)High alumina brick
3)Insulation brick TM23,TM26,TM28
4)Resist aid brick 
5)Ceramic fiber blanket
6)Castables, mortars ,cements, ramming mixes