Argus Embedded systems leading service provider in foam. Foam is a polyethelyne foam filled with carbon (as are all black ESD foams),
giving it its conductive properties and color. Foam is designed for repeat use and will act as a Faraday cage when an item is fully enclosed within it.
A conductive foam will drain batteries if their contacts have a path the foam, so care must be taken totic dissipative foam layer between the conductive foam and the item being packed). There are two grades of conductive foam: lead-insertion grade and component grade.
Lead-insertion grade conductive foam is designed to have components directly mounted into the foam via their leads and will drain charge off of attached components.

Anti-Static foam is a polyurethane foam that is chemically doped with an anti-static agent (surfactant) and colored with a pink dye for identification. An anti-static foam will not generate a static charge when it rubs against itself, but will happily pass a charge through itself to anything contained within (thanks to EEVblog for explaining that one).

Because anti-static foam does not provide shielding it must be placed within a shielding bag. Another key property of anti-static foam is that it has a shelf life when exposed to the environment. Thus it is usually used as a one-time foam for shipping components. It is the least expensive type of ESD foam. It has a surface resistance of 10^9 to 10^10 Ohms or less (the higher this number the more slowly a charge is dissipated).

There are many different types of foam available, and each has its unique characteristics and applications to meet customer requirements.
1.Polyurethane (PU)
2.Polyethylene (PE)
3.Convoluted Foam
6.Dissipative foam?