Abstract
Pieces of Melinex O polyester films (0.003 in. thick) can be used as substitute for glass in flat-face embedding in epoxy resins for electron microscopy. Melinex sheeting can be obtained from Imperial Chemical Industries. It can be sterilized by alcohol or by autoclaving. It is transparent and it is resistant to customary cytological processing fluids. It separates readily from the resin block wihout the use of water and without cooling.