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SCOPE
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This specification defines the
requirements for beryllium foil and x-ray windows produced by machining,
extruding, slicing, and/or hot rolling Be ingots cast from vacuum melted
electrolytically refined flake and is designated IF-1™.
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COMPOSITION
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The vacuum cast ingot to make
foil or x-ray windows to this specification shall meet the following chemical
limits:
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| Be Assay |
99.8% |
Minimum |
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Maximum
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Maximum
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Be Oxide
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0.06%
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Lead
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0.0005%
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Iron
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0.03%
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Manganese
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0.003%
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Aluminum
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0.01%
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Molybdenum
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0.001%
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Magnesium
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0.006%
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Nickel
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0.02%
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Silicon
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0.01%
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Calcium
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0.02%
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Carbon
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0.03%
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Zinc
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0.01%
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Chromium
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0.0035%
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Silver
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0.0005%
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Cobalt
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0.0005%
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Titanium
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0.001%
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Copper
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0.005%
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Other metallic impurities as determined by normal spectro-graphic
techniques. Beryllium may be determined
by difference (i.e. 100% - other elements).
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Detailed analytical procedures used by BW-Electrofusion Products are available upon request.
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AVAILABILITY
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Foil to this specification is
available as flat stock in standard thickness range 0.0001" (2.5 micrometers) to 0.020" (508 micrometers). Foil is supplied cut to shapes such as
rectangles, circular discs and other configurations. Foil is supplied either vacuum tight,
optically dense or as-rolled in the following thickness ranges.
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Classification
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Foil
Thickness, inch (micrometers)
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Vacuum tight
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0.0003 (7.6)
to under 0.020 (508)
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Optically dense
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0.0002 (5.1)
to under 0.020 (508)
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As-rolled
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0.0001 (2.5)
and over
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Please contact Brush Wellman - Electrofusion Products for
available sizes and tolerances.
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MATERIAL QUALITY
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- Foil Integrity Foil is available in three classifications of integrity, as defined below:
- Vacuum Tight There shall be no detectable leakage through the foil when tested with a helium mass spectrometer leak detector with a sensitivity of 1 x 10-9 atm-cc/sec.
- Optically Dense The foil shall not be penetrated by light when tested by illuminating one side of the foil over a restricted area with a high intensity light source and viewing from the opposite side in a darkened room.
- As-Rolled Supplied in as-produced condition, being neither inspected for nor guaranteed to be vacuum tight or optically dense.
- Surface Quality Material shall be uniform in quality and condition, clean, sound, and free from foreign materials and from internal and external imperfections detrimental to fabrication or to performance of parts.
- Surface Finish The surface finish of standard foils shall be 40 microinches Ra or better. Various thick-nesses may be available in different surface finishes. Please consult BW-Electrofusion for availability.
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| TOLERANCES
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Thickness
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to 0.0009"
0.001"
0.002" to
0.020"
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+0.0002"/-0
+0.0002"/
-0.0001"
�10%
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Diameter
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0.5" to 4.0"
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�0.005"
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Length &
Width
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to 3.0"
over 3.0"
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�0.015"
�0.030"
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Special tolerances on disc and straight-cut foils are available on request. Please consult Brush Wellman - Electrofusion Products for price and availability
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PACKAGING
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Material will be appropriately
identified, packaged, and labeled to comply with applicable government
regulations and/or standard procedures of Brush Wellman - Electrofusion
Products.
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HEALTH AND SAFETY
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Handling beryllium in solid formposes no special health risk. Like many industrial materials, beryllium-containing materials may pose a health risk if recommended safe handling practices are not followed. Inhalation of airborne beryllium may cause a serious lung disorder in susceptible individuals. The Occupational Safety and Health Administration (OSHA) has set mandatory limits on occupational respiratory exposures. Read and follow the guidance in the Material Safety Data Sheet (MSDS) before working with this material. For additional information on safe handling practices or technical data on beryllium, contact Brush Wellman Inc. - Electrofusion Products.
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