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The planchets are made of Beryllium with a 99% or better purity and any of the possible impurities will not exceed 0.08% . In fact most of the possible impurities are well below 0.01%. Using proper cleaning and safety procedures the planchets can be used again. Available in three sizes to fit the most widely used specimen mounts. Surface finish is smooth: 1.6µm or less and is perfectly suitable for many applications.
SDS (165KB PDF)
Typical BE Planchet Composition impurities in AT %
Warning: Cleaning and handling of Beryllium must be done in such a way that it does not generate particulates which are toxic when inhaled.
An alternative for beryllium planchets could be graphite planchets which also give a low background and virtually no characteristic peaks other than carbon.