国产精品久久久久久久久99热-亚洲欧美人成综合在线最新-欧美成人网在线综合视频-亚洲精品无码久久久久久久性色

HF % ≥

H₂O % ≤

SO₂ % ≤

Involatile acid
(as H₂SO₄) % ≤

H₂SIF₆ % ≤

Premium grade

99.98

0.01

0.001

0.003

0.006

Top grade

99.95

0.03

0.007

0.005

0.010

First grade

99.90

0.06

0.015

0.020

0.020

Qualified product

99.70

0.10

0.030

0.050

0.050