Sectioning was performed under cryogenic conditions (21008C) using a microtome equipped with a glass knife. Ultrathin sections were stained using osmium tetraoxide (OsO4) vapor so that the NBR phase appears to be dark in the transmission electron microscope (TEM) pictures. The damaged zones of the PVC–NBR blends were observed on a Hitachi H-800 TEM. A small piece of a PVC–NBR26 blend was cut from a tensile bar after being subjected to a tensile test. The small sample was immersed in liquid nitrogen and then fractured. The cryo-fractured surface was coated with gold, and was then observed on a Leica Stereoscan 440 scanning electron microscope (SEM).