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.
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.
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. |
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.
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:
Maximum
Mean
Temperature |
Type Brick |
|
1800°F (982°C) |
BNZ-20 |
|
2100°F (1149°C) |
BNZ-23, BNZ-23HS, C-22Z |
|
2200°F (1204°C) |
BNZ-25, BNZ-26,
BNZ-26-60, BNZ 26-HS
BNZ-28 |
|
2400°F (1316°C) |
BNZ-3000 |
|
2600°F (1427°C) |
BNZ-32 |
Consult
your BNZ representative for recommendations on the best
combination of products for your temperature, processing
and atmospheric conditions.
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-20
has the low density to meet the criterion for ASTM Grade
20. Its low reheat shrinkage meets the ASTM Grade 23
criterion.
BNZ-23 is the traditional 2300° IFB manufactured
by BNZ. It has a history for excellent service in
suspended arch designs under cycling conditions.
BNZ-23 HS is a high strength ASTM 23 Grade for
applications where a stronger brick than the traditional
23 is required.
BNZ-26 is the standard ASTM Grade 26.
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.
BNZ-28 is the traditional ASTM Grade 28.
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.
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.
C-22Z
is a higher strength IFB for applications
to 2300°F. It is normally specified in load bearing
applications.
BNZ-24 is a low density, low conductivity IFB. It
is designed for applications such as pottery and other
ceramic kilns where capability of cone 10 firing is
required.
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. |
