One of the problems many people have when considering a foam scrap compactor or densifier is how much waste they have. Foam packaging blocks and colored styrofoam sheets are very lightweight and can be very bulky. With these materials, what appears to be an immense quantity isn't a substantial amount at all. Typical polystyrene foam packaging and insulation is usually in the density range of 1 to 2 pounds per cubic foot. What this means is if you have a 12-inch x 12-inch x 12-inch cube of solid foam, it would weigh between 1 and 2 pounds. Since most packaging foam is not used in a solid block form but is molded into relatively thin designs to protect products, several cubic feet of polystyrene or polyethylene packaging foam may be required to equal a pound of foam.