Finance and Business What is a plastic core? What is a plastic core? Plastic cores are precision cut tubing with chamfered ends, burr-free cuts, and tight tolerances. ... Plastic cores are extruded from thermoplastics, cut to size, and machined so that the ends have a smooth, clean finish.Nov 20, 2019 Related Posts:Can you grind coffee beans with a magic bullet?Is flexible gas line safe to use for main?What type of acrylic can be laser cut?What is the maximum safe temperature for PEX tube?