Rubalit® 708 D

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Description

Rubalit® 708D is a highly dense technical oxide ceramic material that can be determined by characteristics of hardness and high strength in combination with that of temperature stability. High corrosion against and wear resistance defines the material for excellent usage in various chemical applications.

This material data has been provided by CeramTec.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

Properties

General

PropertyValueComment

Density

3.73 g/cm³

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Surface roughness

0.8 μm

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as fired surface

Water absorption

0.1 %

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Mechanical

PropertyValueTesting StandardComment

Flexural strength

300 MPa

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DR sigma 0

0.63-1.00 mm thickness | rings 6 / 12 mm

Thermal

PropertyTemperatureValueComment

Specific heat capacity

20 °C

0.7 J/(kg·K)

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100 °C

0.9 J/(kg·K)

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Thermal conductivity

20 °C

22 W/(m·K)

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Xe-flash | sample 16*16mm² | material specific thickness ≤ 3.5mm

Electrical

PropertyTemperatureValueFrequencyComment

Dielectric constant

8.3 - 11.3 [-]

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1 GHz, 10 MHz, 100 MHz

2mm thickness | Ra ≤ 0.4μm

Dissipation factor

0.01 [-]

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1 GHz, 10 MHz, 100 MHz

max. | 2mm thickness | Ra ≤ 0.4μm

Electrical resistivity

20 °C

1e+11 Ω·m

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200 °C

1e+09 Ω·m

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400 °C

1e+07 Ω·m

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600 °C

100000 Ω·m

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Technological properties

Property
Application areas

CeramTec uses Rubalit® alumina ceramics for CeramCore cores for metal-oxide, carbon-film, metal-layered, thin-film and wire-wound resistors.

The fine structures of Rubalit® 600, 702 und 708 play a vital role in delivering very high and consistent surface quality. Using Rubalit® 600, 702 und 708 as core materials help create resistors with a lower noise factor and more stable resistance, increases resistance against electrical shock loads and improves reliability in laser trimming. This makes it possible to achieve higher integration density while simultaneously ensuring higher power density.

CeramTec boasts decades of manufacturing experience, enabling the company to produce ceramic parts for passive components with tight dimensional tolerances while delivering very high surface quality even for large-scale production with quantities ranging in the billions.

Chemical composition

The material main component is Al₂O₃ with 95.8% content. Residue mainly consists of MgO, SiO2 and CaO and traces of other elements.