Inflatable packers use reinforced elastomer bladders inflated with cement or fluid. They seal in irregular or damaged casings and open holes. Bladder materials combine HNBR or FFKM outer layers with aramid fabric reinforcement. Inflation ratios exceed 200–300% while holding 10,000 psi differential across 9-5/8" and larger casings https://globalsealstech.com/product/packer-element/