Test items

检验

Qualified product

合格品

First Grade

一级品

Premium grade

优级品

Appearance

外观

Colorless clear liquid

无色透明液体

Water（KF）

水分

≤0.5%

≤0.2%

≤0.1%

Related substances

有关物质（GC）

Methanal甲醛

-

≤0.01%

≤0.01%

Methanol甲醇

-

≤0.01%

≤0.01%

Methylal甲缩醛

-

≤0.01%

≤0.01%

Peroxide (by hydrogen peroxide)

过氧化物(以过氧化氢计)

-

≤0.005%

≤0.005%

Acidity (by formic acid)

酸度（以甲酸计）

≤0.01%

≤0.005%

≤0.005%

Purity（GC）

纯度

≥99%

≥99.90%

≥99.99%