insulating aggregates

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Insulating Aggregates

BNZ Materials insulating aggregates are formed by crushing large slabs of specialty formulated low-density insulating material. The pulverization process is done with special equipment designed especially for this type of material.

More Info on Insulating Aggregates

BNZ 50-101 (BNZ Aggregates 2337, 2500, 2645, 2653, 2855, 2861) SDS

Typical Applications

Raw Material.
For manufacturing insulating castables.

Loose Fill.
For insulating irregular spaces where other types of refractories are difficult to use.

Hot Topping Compound.
For covering steel ingot hot tops and risers in ferrous and non ferrous foundries.

Advantages

Selection.
Blazelite insulating aggregates are available in different chemical compositions for different temperature functions. They are also available in two different gradations.

Economical.
Can be combined with shipments of other materials from the Zelienople plant to reduce freight charges. Installation as loose fill is quick – reducing labor costs versus other refractories.

High Quality.
Produced under rigorous quality standards by the same process used in manufacturing insulating fire brick.

Available Types

The first two numbers in the following Blazelite aggregates designations refer to the refractories or heat resistance of the aggregate. The second two numbers refer to the approximate density of the slab. An LI designation means it low in impurities of ferric oxide and titania. The LI designated aggregates are suitable for use in reducing atmospheres when combined with low iron calcium aluminate cements.
Blazelite Aggregates

2337 LI.
Can be combined with portland cement or calcium aluminate cements to produce a low-density, low-temperature insulating castable for 2300°F service or below.

2645 LI.
A lower density version of 2653 LI used for the very lightest castable in the 2400 to 2600°F range.

2653 LI.
A high purity material for temperatures of 2400 to 2600°F, used extensively for low-iron insulating castables.

2855 LI.
Used as a high temperature filler material and for the lightest weight high temperature castables. Its high purity is absolutely necessary for high temperature applications.

2861 LI.
An alternate to 2855 LI, it is used when a higher strength insulating castable is desired.

Typical Data

Type Aggregate
Physical Properties 2337 LI 2645 LI 2653 LI 2855 LI 2861 LI
Density, pcf 37 45 53 55 61
Cold Crushing Strength, psi 160 275 400 300 400
Permanent Linear Change, %  
    24 hr soaking at temperature
      2200°F 0.0
      2300°F 0.0
      2400°F -3.0 Trace Trace
      2500°F Trace Trace
      2600°F -0.8 -0.8 0.0 0.0
      2700°F -4.4 -4.4 0.0 0.0
      2800°F -1.5 -1.5
Chemical Analysis, %
    Alumina – Al2O3 39.4 47.0 47.0 67.0 67.0
    Silica – SiO2 54.9 49.2 49.2 30.5 30.5
    Ferric Oxide – Fe2O3 0.7 0.6 0.6 0.3 0.3
    Titania – TiO2 1.5 1.3 1.3 0.9 0.9
    Calcium Oxide – CaO 3.0 0.3 0.3 0.3 0.3
    Magnesium Oxide – MgO 0.1 0.1 0.1 0.0 0.0
    Alkalies Na2O & K2O 0.4 1.5 1.5 1.0 1.0

Screen Analysis
2645LI
Percent Blazelite 2653 LI
On Screen 2337 LI 2681 LI
Retained Aggregates 2855 LI
Grind (cumulative)
5/16 7/16* 5/16* 9/16*
1/2 Mesh 0 0 0 0
3 Mesh 1 4 1 4
4 Mesh 6 10 5 10
10 Mesh 23 26 22 22
28 Mesh 38 43 40 40
65 Mesh 50 53 62 62
Minus 65 Mesh 50 47 38 38
* This grind will be supplied in the absence of a grind designation on order
Standard Aggregate Packaging Schedule
All Grades – 50 lbs. per bag / 35 bags per pallet

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