No.

Index name

Top grade

First grade

Qualified product

1

Appearance

Colorless gas under normal temperature and pressure

2

Octafluorocyclobutane, %≥

99.999

99.99

99.9

3

Unsaturated hydrocarbon content, %≤

0.001

0.005

0.03

4

Oxygen content, ppm≤

10

30

30

5

Water content, ppm≤

10

30

30

6

Acidity, %≤

0.00001

0.00001

0.0001