H2S-resistant packer elements are mandatory in sour fields. Compounds pass NORSOK M-710 or ISO 23936-2 sour aging tests, retaining ≥70% tensile strength after 160–672 hours in 10% H2S at 200°C mixtures, preventing cracking and loss of seal in high-H2S reservoirs like Zechstein or Khuff formations. https://globalsealstech.com/product/packer-element/