Polymers Processing Methods Molding Injection MoldingPlastic Injection Molding - Medical & Pharmaceutical Device Contract Manufacturing - CJ Industries Home C & J Industries is a full-service, custom manufacturer of high precision plastic injection molds , custom molded plastic components and complete contract assemblies. As a custom plastic injection molder , C & J has expertise in processing both engineering and commodity grade plastics in 50 presses ranging from 20 to 720 tons of clamping pressure. Since we began in business 45 years ago, C & J Industries has expanded our capabilities signi