ALTRA® POLYCRYSTALLINE ALUMINA FIBER MAT

POLYCRYSTALLINE ALUMINA FIBER MAT

Polycrystalline Alumina Fiber Mat

ALTRA® alumina fiber mats are high-purity, low shot content polycrystalline materials for refractory insulation applications up to 1650°C (3000°F). ALTRA® fibers are manufactured via a sol-gel solution process to control fiber diameter and non-fibrous shot content. Controlled firing yields the optimal crystalline phase for maximum resistance to thermal shrinkage at elevated temperatures. Two grades are available for a broad range of applications.



ALTRA® MAT 72

Mullite composition, superior thermal shrinkage resistance, compressibility, and resiliency. Preferred composition for fabrication of modular linings for oxidizing and neutral atmospheres up to 1650°C.


ALTRA® MAT 97

High-alumina composition, excellent resistance to reduction at high temperatures in dry hydrogen and vacuum atmospheres. Preferred composition for resistance to chemically induced shrinkage from direct contact with most vapors and solids, including alkalis, acids, and iron oxides.



ALTRA® POLYCRYSTALLINE ALUMINA FIBER MAT
Properties GRADE
ALTRA® MAT 72 ALTRA® MAT 97
Typical Composition

Al2O3
SiO2
Fe2O3
Other oxides

> 71
< 28
< 0.1
< 0.2
> 96
< 3.5
< 0.1
< 0.2
Linear Shrinkage % @ 1500° C
6 lbs/ft³ Mat

24 hrs
48 hrs
72 hrs
134 hrs
192 hrs

0.8
1.1
1.1
1.2
1.5
3.9
6.3
6.2
5.9
5.9
Thermal Conductivity (W/mK)
6 lbs/ft³ Strip Module

200°C
400°C
600°C
800°C
1000°C
1200°C
1400°C

0.06
0.09
0.13
0.19
0.28
0.41
0.61
0.06
0.10
0.16
0.25
0.39
0.62
0.97
Shot Content
> 75 Microns (> .003”)
< 1% < 1%
Availability

Density(lbs/ft³)
Roll Size
Thickness

3, 5 and 6
24” wide x 283” long (47.2 ft²)
½” and 1”
3.5, 5 and 6
24” wide x 283” long (47.2 ft²)
½” and 1”


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