Open Cell Foams
Open cell foam is breathable to vapor, liquids, and even air depending on the the product. It is available in a wide range of densities, thicknesses, and compression types. Depending on the application, there are a wide range of open cell pores per inch available. While virtually any foam can be produced as open cell, by far the most common type produced is polyurethane, due to its flexibility, performance, and cost. Melamine is the second most common open cell foam produced.
Closed Cell Foams
Closed cell foam is impervious to water, vapor, and air, which makes it a natural sealing agent. It is available in a wide range of densities, thicknesses and polymer types. The wide range of compression set available enable this foam to fill gaps, compress as required and ensure that the product provides a seal that does not allow liquid penetration. Nearly every elastomeric rubber and many plastic resins are produced as closed cell foam. These foam counterparts provide many of the same environmental, chemical, and temperature benefits as the base polymer. Material blends are also available which can create unique product advantages.
Solid Rubber
Solid rubber products are durable materials that are great for absorbing shock, impact, and abrasion. They can be used as liquid seals and come in a wide range of types, durometers, and thicknesses. Each rubber type exhibits different physical properties that can be leveraged to best perform in specific applications.