I-70-H Beryllium Instrument Grade

Alternative and trade names
I-70-H
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Description

I-70-H grade beryllium consists of 99% beryllium with a maximum of 0.7% beryllium oxide. Low oxide grades allow for bare beryllium mirrors to yield a lower level scatter and to polish easier than higher oxide grades. I-70-H grade beryllium metal is stable over a wide range of temperatures from -196°C to 226°C (-321°F to 440°F) and offers superior reflectivity in the far infrared region (98.5% at 8-12 micron wavelengths) without optical coatings. This IR reflectivity enables designers to create defense applications that are more difficult to detect.

This material data has been provided by Materion Brush GmbH.

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

PropertyTemperatureValueComment

Density

23.0 °C

1.85 g/cm³

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Theoretical density for BeO: 0.7%

Grain size

12 μm

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max., ASTM E-112

Mechanical

PropertyTemperatureValueComment

Elongation

23.0 °C

2 %

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in 4 diameters

Tensile strength

23.0 °C

345 MPa

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Yield strength Rp0.2

23.0 °C

207 MPa

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Chemical properties

PropertyValueComment

Aluminium

0.07 %

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max.

Beryllium

99 %

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min., BeO: 0.7% max

Carbon

0.07 %

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max.

Iron

0.1 %

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max.

Magnesium

0.07 %

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max.

Other

0.04 %

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max., other metallic impurities each

Silicon

0.07 %

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max.

Technological properties

Property
Application areas

It is hot isostatically pressed beryllium grades used in space applications and for low-density, bare polished optical applications or when reduced weight is required. These grades offer high microyield strength allowing instrumentation to keep their form when exposed to stress. Beryllium metal is more resistant to changes in temperature extremes.