Abstract: An endless chain conveyor system employing modular track units. The track is of a ultra high molecular weight plastic and is of generally horizontal I-shape in transverse cross section. Each side of the track includes a longitudinal slot running the entire, predetermined length of each modular track. Side mounting rails of stainless steel are positioned within each slot. The side rails rigidify and strengthen the plastic track, permitting a smaller cross section track to be used, and also inhibit tearing of the track units of their joined ends. The track units are made of predetermined lengths, such as one foot, two feet, etc., and are used to construct endless conveyors of any desired length. The track units may also be curved to any desired angle.