4.6. Other gases: hydrogen, purity at least 99,995 %, free from organic impurities (CnHm 4.7. Anhydrous sodium sulfate (Na2SO4).
4.6. Andere gassen: waterstof, zuiverheid ten minste 99,995 %, zonder organische verontreinigingen (CnHm 4.7. Natriumsulfaat (Na2SO4), watervrij.