Specifications refractory furnace brick

By Admin | Construction Materials
09 April 2016

traditional way of heating of low-rise residential buildings provides for a special capital facilities of various kinds.The material for them is a brick kiln characteristics, which provide the necessary resistance to high temperature stress.It is used to create the ability to isolate the shells open fire and protect structures from destruction.

heat-resistant bricks used for lining the internal surfaces of the oven domestic and industrial purposes, as well as fireplaces, smoke ducts and pipes.This building material used for the construction of the outer fixed structures, and barbecue grills.Fireclay, among other things, can be used for lining combustion chambers and solid water-heating boilers.

Furnace characteristics bricks (fireclay, refractory bricks)


  1. composition, production and variety of furnace bricks
  2. density and solid furnace brick
  3. strength
  4. temperature limit
  5. thermal conductivity of refractory bricks
  6. Resistance toaggressive media
  7. Water absorption
  8. Frost refractory bricks
  9. size and precision of geometric shapes
  10. manufacturers of ceramic bricks

composition, production and variety of furnace bricks

basis of the conditions resulting from the combustion of solid fuel, furnace brickmust meet three basic requirements:

  • heat resistance of at least 1000 ° C without loss of strength with prolonged exposure.
  • Low thermal conductivity protects the surrounding building structures.Thermal stability
  • product must withstand a significant amount of heating and cooling cycles.

Brick kiln refractory is an excellent battery power, in other words, it heats up fast enough and gradually loses heat to the environment.

refractory bricks are manufactured in specialized plants of Technology provided with GOST 390-96.The composition of the raw materials used for the production of furnace bricks as a main component include clays special grades of up to 70%.Introduction to the molding composition certain types of charge allows to obtain blocks with different properties, additives may serve:

  • graphite;
  • coke in powder form;
  • large fraction of quartz powder.

Technology of fire-resistant bricks dry pressing method involves the implementation of a number of operations in the following sequence:

1. Preparation of raw materials: crushing and kneading the clay, the introduction of the charge, stirring until homogeneous.In this process, a part is added to 8 to 10% of water to achieve the required humidity.

2. finished weight is loaded into a hopper from which it is fed to the metering carriage moves back and forth.

3. molded brick is supplied to the lower punch of the mold, which falls together with the workpiece.

4. upper part of the press is lowered and has a brick pressure sufficient to seal it.

5. Upon completion of the lower punch pushes the block from the mold to the site.At this point, the carriage starts to move from the hopper to the next portion of the raw material workpiece moves onto the conveyor belt.

6. pressing process is repeated, and the adobe is sent as the formation of the party in the firing in the kiln tunnel type at about 1000 ° C.

This technology allows to exclude the operation of pre-drying the product and reduce the time of its production.This method of manufacturing a fire-resistant brick is much cheaper plastic molding method, when the mass of the prepared humidity 17-30% is a continuous beam.Procurement of special machines cut into individual units, which are supplied to pre-drying, followed by firing.

building materials market an extensive range of furnace fire-resistant bricks of the following types:

Aluminous brick
Fireclay furnace brick

Semi-acid firebrick
semi-acid firebrick

Silica refractory bricks
Silica refractory bricks

mullite firebrick

corundum refractory brick

type refractory bricks Stamps refractory bricks
Fireclay Shack;SHA-I;SB-I;BC-I (II);SHUS.
semi-acid PB-I;PB -II;PV- I;PV- II.
Silica Nam
Refractory lightweight and semi-acid- was 1.3;SHKL-1,3;SHL-1.3;SHL-1.0;SHL-0.9;SHTL-0.6;SHL 1-6,4;SHL-0.4.
mullite lightweight SCLC and SCLC-0,8-0,7
mullite lightweight MLL-1,3
Corundum lightweight KL-1,1
earthslightweight DP1-1,2
mullitokorundovaja ISS-72
mullite MLS-62

Specifications furnace refractory bricks depend on the type and brand, for convenience, they are summarized in the table:

index normal value for the grade brick
Refractoriness, ° C 1730 1690 1650 1630 1580 1670 1580
porous products,% 23 24 24 - 30 24 -
Tensile strength, N / mm2 23 20 - 22 12 20 15
Content additives
Al2 O2 33 30 28 28 28 - -
Al2 O3 - - - - - 14 - 28 14 - 28
SiO2 - - - - - 65 - 85 65 - 85

density and solid furnace brick

Physical and chemical characteristics of refractory products is largely determinedfeedstock composition and production method.For the construction of fireplaces, stoves, household or industrial use, and other similar structures used brick.Density is one of the most important parameters of this kind of products controlled by the plants.

check is carried out in accordance with the procedure established by the GOST 24468-80 requirements.In the process of measurement defined apparent density and total porosity of bricks.The optimum ratio between these parameters to achieve maximum strength and stability of the product to environmental conditions.Limit density values ​​for different grades of refractory bricks defined in ISO 53406-2009.

The porosity of the brick kiln


inner surface of furnaces and fireplaces exposed to high temperatures and open flames.Brick kiln flame retardant has the ability to effectively confront the specified factors.The tensile strength of each of the product depends on the brand, strict observance of the recipe and production technology.Quantitative values ​​for different types of refractory blocks indicated in the above table.

maximum tensile strength is fireclay bricks mark Shaq who is 23 N / mm 2. These products are widely used for domestic and technological masonry kilns in industry as well as a fireplace in the house.When choosing a particular brand of brick setting the ultimate strength is crucial.

temperature limit

Furnaces household stoves and fireplaces in direct contact with an open flame and flue channels and pipes to warm up to high temperature combustion.Materials used for the construction of these facilities should have a high temperature limit.State standards determine its value for different grades of refractory blocks for general use.

Maximum heat resistance have chamotte bricks of various kinds, the temperature limit for them is in a broad range from 1630 ° C to 1730 ° C.Requirements for materials other components of fireplaces or stoves are less stringent.Thus, the material for the chimney must withstand a temperature of about +700 ° C.

thermal conductivity of refractory bricks

Furnace fireproof bricks used for the laying of furnaces and smoke ducts, designed to protect the adjacent constructions of high impact.To achieve this, the product must have a low thermal conductivity.Refractory bricks of different types have the following parameters in this parameter:

  • fireclay bricks - 1, 8 - 1.9 W / (m * ° C);
  • Silica - 1.9 -1.95 W / (m * ° C);
  • magnesite - 2.6 - 2.8 W / (m * ° C);
  • hromomagnezitovy - 2.75 - 2.85 W / (m * ° C).

The above list shows that the lowest thermal conductivity has fireclay bricks, which received the maximum spread in the building.These bricks reliably protects the building structure from the effects of high temperatures and are able to accumulate heat.

Thermal conductivity

resistance to corrosion

refractory bricks, the characteristics of which are at a high level, the operation of furnaces in contact with the fire and combustion products.Impact of acids or alkalis or other aggressive media for products in these facilities are virtually eliminated.Accordingly, the special requirements for this indicator is not shown to them.

Due to its composition of refractory fireclay bricks should not be used in designs where contact with an acid medium.This can lead to premature failure.Other refractory bricks also have their own characteristics that must be considered when selecting materials for the construction of furnaces and fireplaces.

Water absorption

Fireproof bricks made of clay and firing it in its structure formed pores.The presence of voids in the product structure contributes significantly absorb moisture from the atmosphere or by direct contact with water.Depending on the kind of products can accumulate blocks of 15 to 30% of its total liquid volume.This is a high figure for a building material.

This property of fire-resistant bricks to be taken into account in the process of warehousing and storage of bricks.Do not allow product outdoors for a long time, especially in rain or snow.This may lead to significant water uptake and adversely affect its strength and other characteristics.

Water absorption

Frost refractory bricks

Scope of refractory bricks - construction of stoves and fireplaces in homes and industrial buildings.These products do not have a high frost resistance due to its structure and the materials used.Under the current standard, this property is the product is assessed as the ability to withstand a certain number of cycles of freezing and thawing in a state of maximum saturation moisture.

for firebrick brand Shack, IIIA, IIIB, and SB, this indicator does not exceed 15 cycles.Refractory bricks should not be used for the construction of basement structures and external cladding of buildings.In the operation of buildings with stove heating or fireplace it is recommended to maintain a positive temperature.Portion of the cooling of buildings to extreme temperatures can lead to their destruction.

size and precision of geometric shapes

To refractory products, general purpose imposed strict requirements in many respects.In particular, the size and accuracy of the current forms of strictly regulated GOST 8691-73, which corresponds to the international standards of ISO 5019 from 84 years.For refractory bricks of different sizes of marks 11 are provided with a certain ratio of length, thickness and height.

Product numbers
1 2 3 4 5 6 6 and 7 8 9 10
Length 230 230 230 230 230 230 230 250 250 300 345
thickness 65 65 114 114 114 114 150 124 124 150 150
height 65 65 100 75 65 40 65 75 65 65 75

Tolerances on the size of the refractory bricks of different types (leschadka, tiles or straight) have the following meanings:

  • along the length of the error of making an article should not exceed 5 mm;
  • width - 3 mm;
  • thickness - 1 - 2 mm.

control finished products according to parameters such as the accuracy of manufacturing is carried out and appropriate forms of special technical departments of the company.Checks of products manufactured selectively for parties of a number of bricks randomly.

manufacturers of ceramic bricks

Increased construction in our country in recent years has had a positive impact on companies manufacturers of relevant materials.Fireclay brick specifications that meet the requirements of standards and affordable prices make the following companies:

  • Group TEREX;
  • Bogorodskiy plant of ceramic wall materials;
  • Verhnevolzhskiy brick factory;
  • Wienerberger Brick;
  • Kerma;
  • "Ceramics" (Lomintsevsky brick factory);
  • "Nerekhta ceramics factory";
  • Brickyard BRAER.

name of the company producing fire-resistant bricks in a wide range and quality.Production data factories demand the builders and the public as the regions where they are located, and in neighboring areas.Competition among manufacturers of building materials has a positive effect on the quality and range.

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