An Injection Molder forms plastic or rubber products, using injection-molding machines; Dumps plastic powder, preformed plastic pellets, or preformed rubber slugs into hopper of molding machine; Starts machine that automatically liquefies pellets, slugs, or powder in heating chamber, injects liquefied material into mold, and ejects molded product; Observes gauges to ensure specified molding temperature and pressure are maintained; Examines molded product for surface defects, such as dents and cracks.