Formalin is a solution of formaldehyde gas (usually about 37-40% formaldehyde by weight) in water, often with a small amount of methanol added to prevent polymerization.
A 40% concentration, sometimes labeled as 40% w/v formaldehyde solution, is typically used for preservation and disinfection purposes.
It is commonly applied in medical laboratories, embalming, and the preservation of biological specimens due to its potent ability to inactivate bacteria, fungi, and viruses.
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