Formaldehyde Formalin (37%)

Formaldehyde 37% is a concentrated aqueous solution of formaldehyde gas, typically stabilized with 7–15% methanol to prevent polymerization. It is widely used in laboratories, histology, embalming, industrial manufacturing, and tissue preservation. This solution is also commonly referred to as formalin when used in biological and medical contexts. It is often interchangeable with paraformaldehyde.