E-line seals for 7-conductor cables use HNBR with carbon fiber reinforcement, sealing 15,000 psi. Dual grease injection counters conductor gaps. NOV’s e-line seals pass RGD at 10,000 psi, per NORSOK M-710. In perforating, these maintain insulation resistance >100 MΩ during runs. https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/