Formaldehyde Aqueous Solution (Paraformaldehyde Aqueous Solution) EM Grade Paraformaldehyde – methanol free solution. A more efficient and rapid penetrant fixative used in combination with Glutaraldehyde and Acrolein fixatives. Easy to break, prescored, 10 ml ampoules sealed under inert gas. 100 ml, 1 L, and 1 Gallon bottles available, as well as 5-Gallon cubes.