![]() In other words, with time, styrofoam interstitial gaps can be filled with water, which is known as “waterlogging”. These gaps, known as “interstitial gaps”, are too small to let water pass through to the other side easily but not small enough to prevent it entirely from doing so. In fact, this includes styrofoam as well as all other kinds of expanded and extruded polystyrene foams.Īlthough all these materials have a closed-cell foam construction, they’re made of polystyrene molecules that are linked together to form a huge network of bonded pellets.ĭue to their construction, there are still some gaps between the expanded closed-cell pellets. In other words, such a material will not only allow any water to pass through, but it’ll also not absorb any water in the process.įor that reason, although polystyrene is a waterproof plastic, styrofoam isn’t entirely waterproof or moisture resistant. Are Polystyrene Foams Waterproof?Īs you know, a material is called waterproof if it’s completely impervious or impenetrable to water. Yet, the word “Styrofoam” is often used as a synonym for polystyrene foam and is widely accepted as an alternative term to describe expanded polystyrene foam (EPS) too. “Styrofoam” is actually the trademarked name of the company that makes closed-cell extruded polystyrene foam used for various applications, including thermal insulation. Also, the material has a pretty stiff structure, which is why it’s commonly used in construction. This is why the material is incredibly lightweight for its volume. One thing you should know about polystyrene foam is that it’s made of more than 95% air. Polystyrene foam is mainly used for insulation and cushioning due to its design and properties. These materials are known as Extruded Polystyrene (XPS) or Expanded Polystyrene (EPS), depending on the nature of the material. Although polystyrene is a hard, solid, and clear plastic, it can be made into a foam-like material. ![]() Polystyrene is a highly versatile type of plastic that has tons of practical applications in various fields. In the following article, I’ll walk you through everything you need to know about Styrofoam water resistance: What is Polystyrene Foam? Styrofoam is the expanded version of polystyrene plastic, which is used in a wide variety of projects, projects, as well as construction.Īlthough styrofoam has a unique closed-cell design that shouldn’t allow water to seep through, Styrofoam is not entirely waterproof.
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