https://www.reksonpolymer.com/Silicone-Inflatable-Gaskets.php

Silicone Inflatable Gaskets is made from High quality Silicone Rubber conforms to FDA 21 CFR 177.2600 for Food grade criteria suitable for Various sealing applications. These inflatable seals starts inflation range from 5mm to 20mm when 2-4 kg./cm2 pressure is applied after installation in door.