E.M. grade , definition :

What does “EM grade” mean

i consult a catalog of products and publications of electron microscopy, where chemicals are specified EM grade. Example: Glutaraldehyde 8%, EM grade; What does “EM-Grade” mean? Highly purified product, generally distilled, in glass ampoules and sealed under an inert gas (nitrogen gas, Argon, …) This quality EM-Grade of your products is mandatory for use in Electron Microscopy. EM grade is a label for chemicals used in electron microscopy. It is highly purified, typically distilled into glass ampoules and sealed under an inert atmosphere. Suitable for use in *E*lectron *M*icroscopy