Home Insulating Firebrick (IFB) Mullite Insulating Firebrick (IFB)

Mullite Insulating Firebrick (IFB)

Mullite Insulating Firebrick (IFB)

Mullite Insulating Firebrick (IFB) are using for Hot Surface and Back-up lining insulation, and it has a characteristic of light weight, low thermal conductivity, low heat storage, small reheat shrinkage, high thermal stability and suitable for superior resistance to reductive atmosphere.

Mullite Insulating Firebrick are made from a variety of oxides, most commonly fireclay or mullite. The desirable features of these brick are their light weight and low thermal conductivity, which usually results from a high degree of porosity.

The high porosity of the Mullite Insulating Firebrick is created during manufacturing by adding polystyrene microsphere or a fine organic material to the mix, such as sawdust. During firing, the organic addition burns out, creating internal porosity. Another way to accomplish high porosity involves the addition of a foaming agent to slip. Using this approach, insulating brick can be cast instead of dry pressed. Additions of lightweight aggregates like diatomite, haydite, etc., is another approach.

Because of their high porosity, Mullite Insulating Firebrick inherently have lower thermal conductivity and lower heat capacity than other refractory materials. ASTM classifies fireclay and highalumina insulating refractories in the following sequence: 16, 20, 23, 26, 28, 30 and 33. These numbers multiplied by 100 represent the nominal service temperature in degrees Fahrenheit to which the refractory can be exposed in service. Typically a 150 to 200°F safety factor is used in selecting the appropriate brick. Products numbered from 16 to 26 are made from a fireclay base and products numbered from 28 to 33 are made from a high-alumina base.
Mullite Insulating Firebrick 01 www.osymen.com  Mullite Insulating Firebrick 02 www.osymen.com

Mullite Insulating Firebrick 03 www.osymen.com  Mullite Insulating Firebrick 04 www.osymen.com

Mullite Insulating Firebrick 06 www.osymen.com  Mullite Insulating Firebrick 05 www.osymen.com

Mullite Insulating Firebrick 07 www.osymen.com e1693989875865  Mullite Insulating Firebrick 08 www.osymen.com    

Typically, Mullite Insulating Firebrick are used as backup materials, but they can also be used as working linings of furnaces where abrasion and wear by aggressive slag and molten metal are not a concern. Special insulating refractories offering significantly higher strength than standard IFB’s are also available. These can be used in applications requiring load bearing ability.

Another type of IFB brick is those based on high purity hollow sphere alumina. These products can be used in high temperature ceramic kiln application and some high corrosive applications as either hot face or back up lining materials.

Where they can be used, Insulating Firebrick offer several distinct advantages:

Savings in fuel cost due to decreased heat losses through the furnace lining and less heat loss to the refractory.

Faster heat-up of the lining due to the insulating effect and lower heat capacity of the insulating refractory.

Thinner furnace wall construction to obtain a desired thermal profile.

Less furnace weight due to the lower weight of the insulating refractory.

A variety of insulating brick provide a range of thermal efficiencies and strengths.

OSYMEN also manufacturers a full range of insulating castable, gunning mixes, and ceramic fiber products to provide additional insulating lining options.

 

References

  1. ^ Modern Refractory Practice, Fifth Edition (Harbison–Walker Refractories: Pittsburgh, Pennsylvania, 1992), Page CR-2
  2. ^ Modern Refractory Practice, Fifth Edition (Harbison–Walker Refractories: Pittsburgh, Pennsylvania, 1992), Page CR-3
  3. ^ Refractory Engineering. Die Deutsche Bibliothek. 2004. ISBN 3-8027-3155-7.

Further reading

OSYMEN BRAND

INS-JM23

INS -JM25

INS-JM26

INS-JM28

INS-JM30

INS-JM32

Classification Temperature

°C

1260

1370

1430

1540

1650

1760

Properties measure at ambient condition (23°C/50% RH)

BD

Kg/m3

560

800

800

890

1020

1200

CCS

MPa

1.2

2.0

2.0

2.6

3.0

4.0

MOR

MPa

0.9

1.2

1.5

1.6

2.0

2.1

High Temperature Performance

PLC
at ( )°C x 24h

%

-0.2

(1230)

-0.3

(1350)

-0.5

(1400)

-0.4

(1510)

-0.8

(1620)

-0.9

(1730)

Thermal Conductivity (ASTM C-182) at mean temperature of

400°C

W/M.K

0.16

0.24

0.24

0.30

0.38

0.49

600°C

W/M.K

0.18

0.28

0.27

0.35

0.39

0.50

800°C

W/M.K

0.22

0.32

0.30

0.34

0.40

0.51

1000°C

W/M.K

0.25

0.37

0.32

0.36

0.41

0.53

1200°C

W/M.K

0.35

0.38

0.42

0.55

Chemical Composition % (tr=trace)

Al2O3

%

45.0

50.0

58.0

67.1

73.4

77.0

SiO2

%

50.0

45.0

39.1

31.0

25.1

21.5

Fe2O3

%

1.0

1.0

0.7

0.6

0.5

0.4

TiO2

%

 

 

0.1

0.1

0.1

Tr

CaO

%

 

 

0.1

0.1

Tr

Tr

MgO

%

 

 

0.2

0.1

Tr

0.1

K2O+Na2O

%

1.1

1.1

1.0

0.8

0.8

0.1

BD: Bulk Density  |  CCS: Cold Crushing Strength | MOR: Modulus of Rupture | PLC: Permanent Linear Change

Last updated: 2024-01-03
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