JM Insulating Firebricks

The “Official” JM Insulating Firebricks

BNZ Materials, originally organized by former Manville Corporation (JM) executives in December of 1987, today has expanded and is international in scope. In addition to operating the two former Johns-Manville (JM) plants located in Billerica, Massachusetts and Zelienople, Pennsylvania, BNZ also operates an Insulating Firebrick Plant in Plemet, France.

BNZ Materials, Inc., USA insulating fire brick plant, is the global supplier manufacturing what were originally known as JM insulating brick. Since the purchase of the insulation brick plant, the JM insulation brick are now called BNZ insulating brick. The same high quality IFB are produced at the original JM plant. Most other companies claiming to have JM insulating brick (imports) are using the JM trade name only, not the manufacturing process. Don’t be fooled.

BNZ manufactures Insulating Fire Brick and refractory specialties at the world’s most advanced IFB plant located in Zelienople, PA. Over sixteen types of Insulating Fire Brick are available for use in applications from 2000°F to 3200°F to meet the specific needs of a variety of industries. In addition to our insulating brick plant, our calcium silicate insulation has been manufactured continuously at our BNZ Billerica, Massachusetts plant, formally JM, for more than 60 years.

With 60+ years of production experience, BNZ Materials is a world leader manufacturing a complete line of insulating products to handle all your high temperature heat containment needs. No matter what your industry, BNZ has the products for you.

[16x16-pdf_iconDownload the IFB Summary Data Sheet]

 

JM Insulating Firebrick Data Sheet

Typical Data STANDARD ASTM C 155 GRADES
Properties  JM 20 JM 23 JM 23 HS JM 23A JM 26 JM 26-60 JM 28 JM 3000 JM 32
BNZ IFB BNZ-20 BNZ-23 BNZ-23 HS BNZ-23A BNZ-26 BNZ-26-60 BNZ-28 BNZ-3000 BNZ-32
ASTM Classification 20/23 23 23 23 26 26 28 30 32
Temperature Use Limit
(Normal oxidizing atmosphere)
°F
°
C
2300
1260
2300
1260
2300
1260
2300
1260
2600
1427
2600
1427
2800
1538
3000
1649
3200
1760
Density, Avg.
ASTM C 134
lb/ft²
kg/m³
lb/BEq
kg/str.
36
577
2.1
0.9
37
593
2.2
1.0
42
673
2.5
1.1
33
529
1.93
0.86
48
769
2.8
1.3
50
801
2.9
1.3
55
881
3.2
1.5
65
1041
3.8
1.7
75
1201
4.4
2.0
Modulus of Rupture
ASTM C 133
lb/in²
MPa
kg/cm²
95
0.7
6.7
105
0.7
7.4
140
1.0
9.9
115
0.79
8
200
1.4
14.1
190
1.3
13.4
220
1.5
15.5
250
1.7
17.6
300
2.1
21.1
Cold Crushing of Strength
ASTM C 133
lb/in²
MPa
kg/cm²
105
0.7
7.4
125
0.9
8.8
190
1.3
13.4
145
1
10.2
270
1.9
19.0
290
2.0
20.4
340
2.3
23.9
440
3.0
31.0
450
3.1
31.7
Permanent Linear Change %
    ASTM C 210
    24 hrs at soaking temp: °F (°C)
    2250 (1232) 0.0 0.0 0.0 0.0
    2350 (1290)
    2450 (1343)
    2550 (1399) -0.4 -0.2
    2750 (1510) -0.7
    2800 (1538)
    2950 (1621) -0.7
    3150 (1732) -0.4
Reversible Linear Thermal Expansion %
    at 2000°F (1093°C) 0.6 0.6 0.6 0.6 0.6 0.6 0.65 0.65 0.65
Hot Load Strength %
    ASTM C 16 deformation
    10 psi load for 11/2 hours: °F (°C)
    2000 (1093) 0 0 0 0
    2200 (1204) 0.2 0.1 0.1
    2400 (1316) 0.3 0.2
Thermal Conductivity Btu-in/ft², hr, °F
    ASTM C 182 (W/mk)
    Mean temperature, °F (°C)
      500 0.9 1.0 1.2 .92 1.6 1.8 2.3 2.8 3.9
      (260) 0.13 0.14 0.17 0.13 0.23 0.26 0.33 0.40 0.56
      1000 1.2 1.3 1.5 1.14 1.9 2.0 2.4 2.9 4.1
      (538) 0.17 0.19 0.22 0.16 0.27 0.29 0.35 0.42 0.59
      1500 1.5 1.6 1.7 1.39 2.2 2.1 2.6 3.1 4.2
      (816) 0.22 0.23     0.25  0.2 0.32 0.30 0.37 0.45 0.61
      2000 1.7 1.8 2.0 1.64 2.6 2.3 2.7 3.3 4.3
     (1093) 0.24 0.26 0.29 0.24 0.37 0.33 0.39 0.48 0.62
     To convert Btu-in/ft², hr, °F to Kcal-m², hr, °C,
multiply by 0.124.
Chemical Analysis
    Alumina – Al2O3 39.4 39.4 39.4 38 47.0 60.4 67.0 69.9 78.3
    Silica – SiO2 51.7 51.7 51.7 45 49.2 36.1 30.5 28.1 20.7
    Ferric Oxide – Fe2O3 0.6 0.6 0.6 0.3 0.6 0.4 0.3 0.3 0.2
    Titanium Oxide – Ti2O2 1.5 1.5 1.5 1.6 1.3 1.0 0.9 1.2 0.5
    Calcium Oxide – CaO 6.4 6.4 6.4 15 0.3 0.1 0.3 0.2 0.1
    Magnesium Oxide – MgO 0.1 0.1 0.1 0.1 0.1 0.2 0.0 0.1 0.1
    Alkalies, as Na2O & K2O 0.3 0.3 0.3 0.5 1.5 1.8 1.0 0.2 0.1

 

Plemet France IFB Grades

The PA Series of insulating fire brick (IFB) adds a lower cost alternative to BNZ’s traditional line of IFB. The PA series is designed for applications where the lower density and finer texture of the standard BNZ grades is not required. They meet or exceed the specifications of ASTM C 155 for each listed grade, and are produced under BNZ’s certified ISO 9002 Quality System.
Plemet France Grades

Additional Insulating Fire Brick

BNZ Roof Module
PA Grade IFB
BNZ 26-60 Whiteware

Advantages of IFB

High Insulating Value. The light weight and high insulating value of BNZ IFB make possible thinner furnace walls, improved efficiency and lower operating
costs.

Strong. The high compressive strength of IFB allows for self-supporting structures at elevated temperatures. IFB are compatible with dense fire brick, and add strength to the whole construction.

Low Heat Storage. Lower heat storage versus dense brick means reduced fuel costs and faster heat-ups in cyclically operated heating equipment.

High Purity. BNZ IFB are low in impurities such as iron, which can adversely affect refractory performance in many applications. They are used in many furnaces with controlled atmospheres.

Accurate Dimensions. Because BNZ Insulating Fire Brick are machined to precise dimensions, courses can be laid quickly and easily, and the result is a stronger, tighter refractory lining resulting in less heat loss through the joints.

Typical Applications

Recommended for use as primary hot face refractory linings or as back-up insulation behind other refractories in furnaces, flues, kilns and similar high temperature
industrial equipment.

Size is no Obstacle

Most BNZ IFB are available in Zelie Jumbo™ series, which require no mortar joints to produce sizes up to 24″ x 9″ x 3″. No longer are there design limitations caused by traditional standard brick shapes and sizes. The nominal cost of Zelie Jumbo sizes is more than offset by the elimination of many mortar joints and significant labor savings.

brick_drawing_bro

Available Forms

In addition to the great number of standard sizes available, Insulating Fire Brick are also available in special cemented or machined shapes. A large
machine shop at the factory is capable of supplying accurate machined shapes of nearly any description. The unique large slab means that a finished shape
will have fewer joints than shapes made from any other IFB manufacturer.

IFB shapes with drilled holes, grooves, flycuts, tapers, radii cuts, skew planes, tongue and groove, notches
and chord cuts are easily fabricated in any quality IFB.

Thicknesses up to 41⁄2,” along with widths up to 12,” allow a range of shapes and sizes for applications such
as suspended roof modules.

Design

Temperature use limits should be considered along with other properties of the IFB in determining the proper
grade to use for your application. The hot load deformation along with the mean temperature (i.e. the temperature at the midpoint of the brick) should be considered as well, to assure a successful application.
Guidelines for the mean temperature of each type brick are:

1800°F (982°C)
2100°F (1149°C)
2200°F (1204°C)

2400°F (1316°C)
2600°F (1427°C)

BNZ-20
BNZ-23, BNZ-23HS, 23A, C-22Z
BNZ-25, BNZ-26,
BNZ-26-60, BNZ 26-HS
BNZ-28
BNZ-3000
BNZ-32
Consult your BNZ representative for recommendations on the best combination of products for your temperature, processing and atmospheric conditions.

Complementary Mortars

BNZ manufactures a range of specially-formulated mortars with the proper water retention characteristics
that makes them uniquely suited for laying porous IFB. Consult your local BNZ representative for the proper mortar for your application.

BNZ Standard ASTM Grades

JM 20 is BNZ-20 has the low density to meet the criterion for ASTM Grade 20. Its low reheat shrinkage meets the ASTM Grade 23 criterion.

JM 23 is BNZ-23 is the traditional 2300° IFB manufactured by BNZ. It has a history for excellent service in suspended arch designs under cycling conditions.

JM 23 HS is BNZ-23 HS is a high strength ASTM 23 Grade for applications where a stronger brick than the traditional 23 is required.

JM 23 is BNZ-23 A is a slightly lower density, higher strength version of the BNZ 2300 IFB which can be used in any application where a lower density IFB may be needed.

JM26 is BNZ-26 is the standard ASTM Grade 26.

JM 26-60 is BNZ-26-60 meets all requirements of an ASTM C 155 class 26 IFB, with a higher alumina content than the standard BNZ-26 IFB. This makes the BNZ- 26-60 specially designed for areas where furnace atmospheres require the chemical inertness of a higher alumina product. These include the exposed lining of ceramic kilns and special atmosphere furnaces.

JM 28 is BNZ-28 is the traditional ASTM Grade 28.

JM 3000 is BNZ-3000 has long been the standard for true ASTM Grade 30 brick. Its low reheat shrinkage at testing temperature of 2950°F is an indication of its ability to
tolerate excursions above normal operating temperatures in applications such as strip annealing furnaces.

JM 32 is BNZ-32 is a reasonably priced alternative to bubble alumina brick in many high temperature applications or where high alumina content is required. The Zelie Jumbo sizes are especially useful as spanner brick over burner tile.

BNZ Specialty Grades

C-22Z is a higher strength IFB for applications
to 2300°F. It is normally specified in load bearing applications.

BNZ-25 has been improved with higher strength. Its 2500°F rating fills the gap above 2300°F without the cost of high temperature brick.

BNZ-26 HS is a new designation of the former BNZ-1400. It has a combination of very high strength and superior thermal shock resistance. Typical applications
include steel ladle and tundish back-up insulation, wear areas of ceramic kilns, carbon baking anode furnaces
and high traffic areas in a variety of furnaces and kilns. This grade also replaces the YUMA brick. YUMA brick
can still be made to order on special request.

The physical and chemical properties of BNZ’s Insulating Fire Brick represent values obtained in accordance with accepted test methods and are subject to normal manufacturing variations. They are supplied as a technical service and are subject to change without notice. Results should not be used for specification purposes.