To capture the properties of crystalline PE, a system of 450 infinite chains was constructed according to the PE crystal structure. Each chain comprised 240 coarse-grain beads, and was connected to itself according to periodic boundary conditions to realize a linear infimer. The system was heated from 1 K to 250 K over 20 million time steps (∼407 ns) while simultaneously allowing the system to anisotropically relax at 0.0 atm. The final configuration from this simulation was used to start 1-atm NPT simulations at 270 K and 300 K. These NPT equilibration simulations were 2 million time steps long (∼20 ns). Two production NVE simulations were then performed at 270 K and 300 K for 2 million time steps (∼20 ns) to establish the properties of PE crystals in absence of fold surfaces and crystal defects.