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分子式：CH2O
分子量：30.03
性狀：無色透明液體，有刺激氣味，腐蝕性強。遇冷聚合變渾濁。能與水任意混溶。在空氣中能逐漸被氧化為甲酸，是強還原劑。
| 含量不少于 | 37.0-40.0 |
| 雜質最高含量(指標以%計) | |
| 色度/黑曾單位 | 15 |
| 灼燒殘渣 | 0.003 |
| 氯化物(Cl) | 0.0001 |
| 硫酸鹽(SO4) | 0.0004 |
| 酸度(以H+計) | 0.5 |
| 鉛(Pb) | 0.0001 |
| 鐵(Fe) | 0.0002 |
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