When fluoroelastomers were introduced to the industry the emphasis was on heat and fluid resistance and processability was considered less important, Since that time huge advances have been made and some modern fluoroelastomers can be processed with an ease approaching that of nitrile rubber, Recent developments in polymer design, curing and process aid technology have resulted in the basis for a new range of Viton terpolymers which will allow shorter cycle times and reduced mould fouling/sticking with no adverse effect on physical properties over currently available types.