99% Alumina Bubble Insulation Brick — 1800°C Grade

99% alumina bubble insulation brick designed for high-temperature furnace linings, thermal barriers and refractory assemblies where low heat storage must be combined with greater mechanical strength than fibrous insulation.

The lightweight structure is produced from alumina hollow spheres, providing a rigid refractory component suitable for laboratory furnaces, sintering equipment and high-temperature process chambers. Standard S4R sizes use the common 230 × 114 mm brick footprint in three practical thicknesses.

Alternative thicknesses, custom dimensions and machined refractory components are available on request.

Pricing available to approved customers

Dimensions (L × W × Thickness, mm)

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The standard range uses a 230 × 114 mm refractory-brick footprint with three thicknesses selected for laboratory furnace construction, localized hot-zone insulation and replacement work. The 1.4 g/cm³ density grade provides a practical balance between thermal insulation and mechanical strength. Alternative thicknesses, custom dimensions and machined configurations are available for non-standard furnace assemblies.

Key Features

✓ ≥99% Al₂O₃ composition

✓ Alumina hollow-sphere refractory structure

✓ 1800°C temperature grade

✓ 1.4 g/cm³ standard density grade

✓ High-temperature dimensional stability

✓ Custom dimensions and machined shapes available on request

Typical Applications

• Laboratory furnace linings

• High-temperature furnace hot zones

• Sintering and heat-treatment equipment

• Furnace floors and refractory partitions

• Thermal barriers and insulation structures

• Custom high-temperature laboratory assemblies

Technical Specifications

Material	Alumina bubble refractory
Product Type	Lightweight rigid refractory insulation brick
Al₂O₃ Content	≥99%
Temperature Grade	1800°C
Standard Bulk Density	1.4 g/cm³
Apparent Porosity	≤60%
Cold Crushing Strength	≥30 MPa
Load Softening Temperature	1700°C at 0.20 MPa
Permanent Linear Change	≤ ±0.2% at 1600°C × 3 h
Thermal Shock Stability	20 cycles — 1100°C air cooling
Thermal Conductivity	0.9 W/m·K at 800°C

Standard Sizes

Length	Width	Thickness
230 mm	114 mm	30 mm
230 mm	114 mm	50 mm
230 mm	114 mm	65 mm

Technical Notes

• The 1800°C value refers to the material temperature grade and should not be interpreted as a guaranteed continuous-use temperature under every furnace condition.

• Mechanical loading should remain within the limits appropriate for a lightweight refractory insulation component.

• Avoid concentrated impact or point loading during installation and handling.

• Brick dimensions can be cut or machined where required for furnace construction and experimental assemblies.

• Final suitability depends on operating temperature, atmosphere, thermal cycle and mechanical loading.

Package Contents

1× 99% Alumina Bubble Insulation Brick
230 × 114 mm — selected thickness

Selection & Custom Sizes

The 30 mm thickness is suited to localized insulation and applications where installation depth is limited. The 50 mm format provides a general-purpose refractory section, while the 65 mm version corresponds to the standard full-brick format commonly used for furnace lining. Alternative thicknesses, custom-cut dimensions and special refractory geometries can be supplied on request.

99% Alumina Bubble Insulation Brick — 1800°C Grade

0.00 € 0.0 EUR 0.00 €

Pricing available to approved customers

Key Features

Typical Applications

Key Features

Typical Applications

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