Is 37% formaldehyde in formalin all considered free formaldehyde?

Formalin has 37% formaldehyde in water. So is it considered 37% free formaldehyde or it is considered attached to water and not free and only turn to free formaldehyde by heat, high pH and microbial ingestion the same as formaldehyde donors? 


  • PhilGeisPhilGeis Member, Professional formulator
    "free" as addressed in regulation (EU) would be all of it
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