Slat, W.S. et al. 2025. The Effect of Temperature Variations on Sheet Press Machines on the Hardness and Toughness of PP (Polypropylene) and HDPE (High Density Polyethylene) Materials. International Journal Science and Technology. 4, 3 (Dec. 2025), 118–131. DOI:https://doi.org/10.56127/ijst.v4i3.2376.