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Sintered Mullite M70

Sintered Mullite M70 is a high alumina mullite raw material for refractory castables, shaped refractories, ceramic kiln furniture and high-temperature industrial lining systems.
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  • M70 / 0.1-5mm / mesh

  • SEPPE

Sintered Mullite M70

SEPPE Sintered Mullite M70 is a calcined mullite raw material for refractory industries. With 70.0% typical Al2O3, low alkali impurities and stable physical data, it is suitable for refractory systems requiring hot strength, resistance to spalling and low thermal conductivity.

Al2O3 70.0% / 68.0% min
Fe2O3 1.3% / 1.5% max
Bulk density 2.7 g/cm3 min
Moisture below 0.3%
M70 Chemistry Snapshot
Typical oxide composition from SEPPE M70 TDS.
Low alkali
70.0%
22.4%
1.3%
3.0%
Al2O3
SiO2
Fe2O3
TiO2

Product Overview

M70 is positioned as a high alumina mullite grade for refractory formulations that need stronger high-temperature performance than economical lower-alumina grades. Its low Na2O and K2O levels help reduce low-melting phases and support stable service behavior.

The M70 TDS lists 2.7 g/cm3 minimum bulk density and moisture below 0.3%, with regular sizes from fine powder to coarse aggregate for different refractory applications.

M70 Visual Selection Guide

Alumina Content Position
M70 is the high alumina option for refractory formulations.
M70 grade view
45%
60%
70%
M45
M60
M70
Low Alkali & Impurity Control
Key control values from the M70 TDS.
Control view
Fe2O31.3% / 1.5% max
Na2O0.05%
K2O0.07%
Moisture<0.3%

Key Features

70% Alumina Grade
High alumina-silica composition for demanding refractory performance.
Low Alkali Impurities
Na2O and K2O are controlled at low levels to support high-temperature stability.
Resistance to Spalling
Suitable for refractory parts exposed to repeated heating and cooling.
Stable Size Supply
Available in aggregate and powder grades for refractory formulation needs.

Technical Data

Al2O3
70.0% / 68.0% min
SiO2
22.4%
Fe2O3
1.3% / 1.5% max
TiO2
3.0%
Na2O / K2O
0.05% / 0.07%
MgO / CaO
0.02% / 0.05%
Bulk Density
2.7 g/cm3 min
Moisture
<0.3%

Regular Sizes

Common Granules
0.3-0.8 mm  /  0.5-1.0 mm
0.7-1.5 mm  /  2-5 mm
Powder & Mesh
16-30 mesh  /  30-60 mesh
-120 mesh  /  -200 mesh  /  -325 mesh
Narrow Ranges
0.1-0.3 / 0.1-0.4 / 0.18-0.3
0.18-0.5 / 0.3-0.7 / 0.425-0.85 mm

Standard sizes are grouped for quick reading. Other particle size distributions can be discussed according to refractory formulation, forming process and final service condition.

Applications

Castables
Refractory castables and low-cement castables requiring stable mullite aggregate
Shaped Refractories
Mullite bricks, refractory blocks and shaped high-temperature products
Kiln Furniture
Ceramic kiln furniture, setters and components exposed to thermal cycling
High-temperature Fillers
Alumina-silica filler systems where refractoriness and low alkali are important

Packing and Storage

Standard packing is 1.0-1.5 MT big jumbo bag. Store the material under dry conditions and avoid contamination during handling and transportation.

FAQ

? What is Sintered Mullite M70 used for?

It is used for refractory castables, shaped refractories, kiln furniture and high-temperature alumina-silica filler systems.

? How is M70 different from lower alumina mullite grades?

M70 has higher alumina content at 70.0% typical, making it suitable for applications requiring stronger high-temperature performance while maintaining low alkali levels.

? Can SEPPE provide M70 TDS and COA?

Yes. SEPPE can provide the M70 technical data sheet, batch COA and particle size information for order confirmation.

Need Sintered Mullite M70 Specifications?
Contact SEPPE for M70 TDS, COA, particle size selection, samples, packaging and bulk order support.
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