Item

Index

Top grade

First grade

Qualified product

The volume fraction of hydrogen (H 2 )/10 -2 ≥

99.95

99.50

99.00

The volume fraction of oxygen (O 2 )/10 -2 ≤

0.01

0.20

0.40

The volume fraction of nitrogen plus argon (N 2 +Ar)/10 -2  ≤

0.04

0.30

0.60

Dew point/℃ ≤

-43

-

-

Free water/(mL/40L bottle)

-

No free water

≤100

Note: The moisture index of industrial hydrogen in pipeline transportation and other packaging forms of Qualified products shall be negotiated between the supplier and the buyer.