The first choice for outdoor rubber sheet is EPDM sheet

EPDM rubber sheets are synthetic elastomers, which are officially known as ethylene propylene diene monomers. EPDM products come in several different products, and their common feature is that they are generally very good at resisting the degrading effects of weathering, ozone, and UV exposure; EPDM sheets Highly recommended as an outdoor rubber for applications with significant environmental impact.
  
  EPDM rubber excels in general exterior applications. Its chemical composition makes it resistant to cracks and discoloration from exposure to UV light and ozone. Cracks are particularly dangerous because they affect the overall integrity and productivity of equipment or products. A good example of this EPDM product application is in the form of window weatherstrips in vehicles. These strips made of EPDM sheets are necessary to protect window glass and vehicles, but they face the exposure of many elements. However, since they are made of EPDM rubber, they can be used for a long time without any degradation. However, damage from ozone and UV light isn't the only challenge this elastomer can combat.
  
  Water is another potential hazard that fails to weaken EPDM. After all, if it can't handle moisture, it won't be a true outdoor rubber. Often, excess water can contaminate materials, cause them to warp or even lead to mold or mildew formation. EPDM sheet rubber does not suffer from this problem and can withstand even exposure to heavy rainfall. EPDM sheets are typically used where good water resistance is required. EPDM sheet rubber products also use blends with SBR, another form of rubber that helps add a higher level of durability to the finished product.