PELCO silicon monoxide with removable formvar coated grids

The PELCO TEM grids are made of 300 mesh copper with support film silicon monoxide and a removable Formvar backing on the opposite side of the grid. When the Formvar is removed, by dipping in solvent, a pure Silicon Monoxide film remains. These films are stable under all EM operating conditions and for use where the presence of Formvar cannot be tolerated. Pure Silicon Monoxide is more delicate than those with Formvar backing and require more careful handling during specimen preparation.