About ENTEK - History ENTEK began the research and development of Polyethylene Battery (PE) Separator production in 1984. Commercial production began in 1987 when the primary... meters of the best battery separator material in the world. Initially, ENTEK shipped its separators to customers throughout the United States, Canada and Mexico. In 1989... it established a joint venture with Cookson Ltd. in Newcastle, called Cookson Entek Ltd. That structure changed when in 1996, ENTEK took complete control of the joint venture and became...