Formaldehyde Natural Buffered SKU: SKU RXSOL-19-1191-210 Product Category: Category Raw Chemicals-19 Variations Formaldehyde Natural Buffered Short Description Short Description Formalin is composed of formaldehyde (37 to 40% (w/v)), where 10% neutral-buffered formalin (NBF) is basically a 4% (v/v) formaldehyde solution diluted using phosphate buffer at neutral pH.