... 3.Shore Durometer: From 30A to 90A Advantages for silicone tube(1). No taste, no toxicity, no contamination ... Permeability(5). Extended flexible life and reduced maintenanceDefects for silicone tubeNot suitable for use with concentrated acids and bases, ... iron, rice cooker, frying pan, disinfection cabinet water dispenser, jam machine, toaster, gas appliance, water heaters) and electronic automotive, ...