Polyethylene (PE) is a thermoplastic mm referred to as a polyolefin. Some of the mmon for of polyethylene are: HDPE, LDPE, LLPE, MDPE, and UHMW. Polyethylene can be processed with a 9.3 or 10.6 micron 2 laser without an appreciable difference in process quality. Polyethylene does not readily HENAN OKAYorb the energy of a 1.06 micron fiber laser.