PEEK seals in wireline tools offer low friction and high strength in corrosive environments. Glass-filled variants enhance wear resistance. Spring-energized PEEK seals maintain contact during thermal expansion. Machined tolerances fit 0.092" to 0.160" cables. Chemical resistance handles H2S and CO2 exposure. Stacks integrate into perforating guns and plugs. Qualification per API stand... https://globalsealstech.com/product-category/oil-gas-seals/oil-free-lubricated-pump-seals/