In a study on the phase separation structure of the FKM/HNBR
blend by Hirano et al. [6], atomic force microscopy [7] and
Transmission Electron Microscopy (TEM) [8] were employed in a
blend analysis and resulted in a phase separation phenomenon at
the FKM/HNBR ratio of 30:70. Kader and Bhowmick, in their study
on a commercial blend of acrylate rubber and FKM [9]