ZIRCAR Ceramics: Alumina Mat

GENERAL INFORMATION
ZIRCAR Alumina Mat is a layered, low density flexible mat made of 100% polycrystalline alumina fiber. It is light in weight, contains virtually no shot and is designed for use to temperatures as high as 1650°C (3002°F).

The high purity aluminum oxide fibers exhibit light weight, low thermal conductivity, low thermal mass and immunity to thermal shock. A minor addition of silica modifies the fiber's microcrystalline structure and act as a grain growth and prevents embrittlement that usually occurs after extended use at elevated temperatures. Alumina Mat resists attack in aggressive chemical environments due to its high purity & refractory nature. It is stable in vacuum, inert or reducing atmospheres.

Alumina Mat is useful as insulation packing in furnace spaces, around furnace sight tubes & ports and fill in expansion joints and masonry cracks.

Alumina Mat offers significant advantages over vitreous alumino-silicate fiber blankets, including:
• High temperature dimensional stability
• Resilience and flexibility after exposure to elevated temperatures
• Exceptional refractoriness

Composition, %
Al₂O₃	95-97
SiO₂	3-5
Trace Elements (total)	<0.5
Sodium, ppm	875
Calcium, ppm	525
Loss on Ignition, % after 2 hr @ 800°C	0
Fiber Diameter, median, micron	3.0 - 3.5
Shot Content (non-fibrous material)	negligible
Thickness, mm (in.)	35 (1.38)
Color	White
Maximum Use Temp.* ,°C (°F)	1650 (3002)
Melting Temp., °C (°F)	2036 (3700)
Density, g/cc (pcf)	.035 (2.2)
Specific Heat, J/kg °K (BTU/lb °F)	1047 (0.25)
Fiber Tensile Strength^‡, MPa (psi)	1.5 x 10³ (220 x 10³)
Young's Modulus, MPa (psi)	3.2 x 10⁵ (47 x 10⁶)
Hardness of Fiber, (Mohs Scale)	6
Linear Shrinkage^‡, %
1200°C (2192°F)	0.0
1425°C (2600°F)	2.2
1535°C (2800°F)	3.0
1650°C (3002°F)	4.0
Thermal Conductivity** ASTM C177-76 W/m °K (BTU/hr ft² °F/in)
315°C (599°F)	0.07 (0.50)
540°C (1000°F)	0.09 (0.77)
760°C (1400°F)	0.13 (1.03)
980°C (1796°F)	0.17 (1.33)
1200°C (2192°F)	0.23 (1.65)
1425°C (2597°F)	0.30 (2.15)
Thermal Conductivity of Alumina Mat (6PCF) in heat treating atmospheres

ITEM #	DESCRIPTION	PRICE*	SHIP WT. (lb.)
D9201	ALUMINA MAT, 18in.W x 24in.L SHEET	$131.00	6
D9202	ALUMINA MAT, 24in.W x 72in.L ROLL	$402.00	12
D9203	ALUMINA MAT, 24in.W x 48.5' L ROLL	$2211.00	35
*Note: Prices shown apply to sales within the United States. Contact us for information regarding international commerce.

*	Maximum use temperature is dependent on variables such as stresses, both thermal and chemical, and the chemical environment that the material experiences.
**	Properties expressed parallel to thickness.
‡	Properties expressed perpendicular to thickness.