Insulating rubber sheets, also known as RUBBER SHEET, are insulating materials primarily made from rubber, mainly using NR, SBR, and other insulating rubbers as raw materials. Some products also contain三元乙丙橡胶 (EPDM rubber) and cis-1,4-polybutadiene. They are manufactured through processes such as compounding, mixing, and vulcanization [3] [5].