The formalin solution contains 37% formalin, 0.2% methanol, and the rest is water. What is its viscosity?
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The formaldehyde solution contains 37% formaldehyde, 0.2% methanol, with the rest being water. At a temperature of 50 degrees, what is its viscosity?
At 50°C, the viscosity is approximately in the range of 0.6–0.8 mPa·s, with 37% formaldehyde, 0.2% methanol, and the remainder being water.
According to AspenPlus, the dynamic viscosity is 0.76 cs, and the kinetic viscosity is 0.68 cp
It’s strange; formaldehyde is also considered a commodity, yet no relevant data can be found online. The viscosity of the 36% formalin solution in my hands at 30°C, as calculated using ASPEN, is 0.5378 mPa·s, which is roughly the same as the value calculated by the original poster. However, the viscosity of the other materials in the project differs significantly from that listed in the manual, so I’m not sure whether these values are correct.
There is very little available data on the physical properties of formalin aqueous solutions. In such solutions, due to the tendency of formalin to polymerize, more than a dozen different components are present, which results in inaccurate physical property values. After all, those who work in this field rely on these physical property parameters for their work; how could they possibly make such data available? The discrepancies resulting from ASPEN calculations are also quite significant