What is the freezing point of a formalin aqueous solution with a concentration of 36.5~37.5%?
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What is the freezing point of a formalin aqueous solution with a concentration of 36.5~37.5%? By freezing point, I mean that of formaldehyde in water. Due to low outdoor temperatures, sometimes there are some white solid particles at the bottom of bottled formaldehyde solutions; these are likely to be formaldehyde. I would like to know at what temperature does formaldehyde in an aqueous solution freeze? This post was last edited by mywlyx on 2009-3-23 08:18]
When stored for an extended period or at temperatures below 10°C, liquid formaldehyde becomes white and cloudy; as the temperature drops or storage time increases, it gradually solidifies into a white paste, which is a result of polymerization (the formation of polyformaldehyde). It is recommended that a steam heating device or a liquid circulation system be installed for long-term storage.