By definition, foam rubber is an open-celled foamed rubber made from natural and synthetic caoutchouc. Its core is porous like a sponge but its exterior skin is impervious – this makes it an integral foam. Profiles and cords made of foam rubber are primarily used as gaskets.
The foam rubber found on the market is close-celled which means that it is not technically foam rubber at all. It is made from EVA (ethylene vinyl acetate) and is distinguished by its excellent light and heat resistance (130 °C - short term, up to 150 °C). But, it should be noted, it is not really elastic at all when cold. Please keep in mind that the colours of the foam can change from one batch to another. Foam rubber is suitable for use as a toy but it should definitely not be swallowed.
Foam rubber can be cut with a blade or a scissors. Gluing work can be done with contact glues (e.g. PATTEX) or two-part adhesives (cyanoacrylate or polyurethane based) as well as with ALL-PURPOSE GLUE (for handicrafts).