Closed Cell Foams are such that the bubble within the foam is completely encased in the surrounding medium or material. This make it impervious to water or gas ingress. As opposed to open cell foam which is soft and pliable, closed cell is harden and more rigid in its structure. It also has a higher insulation rating (R-Value) than open cell foams, and certain types of closed foams are used in building insulation for this reason.
However, due to it requiring more raw materials in its construction, it can also be more expensive and heavier than open cell.
Closed cell foams have multiple uses, such as being used to prevent water or air from passing from one area to another, making them an ideal medium for plugging gaps and for other uses.
- Seals & Gaskets
- Joint fillers
- Impact Protection products
- Thermal Insulation
- Extrusions for edge protector foam, pipe insulation foam or backer rod foam
One such example is in manufacturing. Every manufacturing technique has a tolerance, and as such when parts are assembled there are gaps which become part of the final product . Since a closed cell foam is impervious to gases or liquids, it is an ideal medium to use to plug these gaps.
The gases within bubbles can’t escape, and so if a heavy weight is dropped on a closed cell foam, the gases are compressed initially, but want to recover, which makes a closed cell foam ideal as a shock absorber. Actual foam selection, is determined by the end use and environment where it is to be used.