Impervious to liquids or gases.
Not allowing substances to pass through.
Impermeable, resistant to penetration by fluids or particles
Material that does not allow liquids or gases to pass through.
Barrier preventing the passage of substances (e.g., water, air).
Impermeable surface resistant to penetration by external agents.
Substance with a tight molecular structure blocking permeation.
Solid object impervious to fluid absorption or transmission.