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  Helium-3 purity specifications

 3He (atom %)
 isotopic enrichment
U.H.P. Grade
H.P. Grade
S.T.D. Grade
CRYO Grade
> 99.995%
³ 99.991%
³ 99.95%
³ 99.8%
 4He + 3He (atom %)
 chemical purity
> 99.9995%
³ 99.999%
> 99.998%
³ 99.995%
 4He (atom %)
< 0.005%
£ 0.009%
£ 0.05%
£ 0.2%
 Tritium (atom%)
< 8 x 10-12
< 8 x 10-12
< 1 x 10-12
< 1 x 10-11


 Typical impurities (in ppm)

 N2
< 1
£ 1
< 5
< 6
 Ar + O2
< 1
£ 1
< 3
< 6
 THC
< 1
£ 1
< 1
< 6
 CO + CO2
< 1
£ 1
£ 2
< 6
 Ne
< 1
£ 1
< 1
< 6
 H2
< 1
£ 1.5
£ 5
£ 6

 Please inquire to Chemgas to receive the assay of  available batches.