Helium Purity Levels

These are typical purity levels and certified gases are available along with many other grades, mixes and pressures to fit your requirements.

Welding / Industrial Grade

minimum purity 99.995%, Max Moisture 10ppm

High Purity 4.7 / Laser

min purity 99.997%, H2O < 3 ppm, O2 < 3 ppm, THC < 1 pmm

Zero Grade 4.6

min purity 99.996%, THC < 0.5 ppm, O2 < 3 ppm

Ultra High Purity 5.0

min purity 99.999%, O2 < 1, H20 < 2, THC < 0.5, N2 < 5, CO2 < 1, CO < 1, N2 < 5, H2 < 1 ppm

Research 6.0 / Chromatographic

min purity 99.9999%, O2 < 0.1; H20 < 0.2, CO2 < 0.1, CO < 0.1, THC < 0.1, N2 < 0.4, Ar < 0.5, H2 < 0.5 ppm