1. Polyethylene: A common plastic used in many applications, including packaging and bottles.
2. Polypropylene: Another common plastic known for its resistance to chemicals, including water.
3. Glass: While not completely impermeable, glass is highly resistant to water penetration.
4. Teflon (PTFE): A non-stick coating known for its extremely low friction and resistance to chemicals, including water.
5. Wax: A natural substance that forms a hydrophobic barrier, preventing water from passing through.
6. Rubber: Depending on the specific type, rubber can be very resistant to water.
It's important to note that "impermeable" is a relative term. Even the substances listed above might allow some water molecules to pass through over time or under specific conditions (like high pressure).
