How much weight can foam hold?

How much weight foam can hold depends on foam type, density, thickness, and ILD, with different foams supporting different weights, similar to how Packout boxes have weight capacity. For example, high-density polyurethane foam with density 1.8 pounds per cubic foot can support around 150 to 200 pounds per square foot for seating, while low-density foam 1.0 pcf supports less around 80 to 100 pounds. Memory foam with density 4 to 5 pcf can support 200 to 300 pounds per person for mattress, with high-density memory foam supporting heavier sleepers up to 300 pounds without bottoming out. Upholstery foam for sofas with ILD 30 to 35 can hold 250 pounds per cushion. For packaging foam like polyethylene foam, weight capacity depends on thickness, 2-inch foam can hold 50 to 100 pounds for delicate items. For mattress foam, quality foam can support 250 to 300 pounds per sleeper, with extra firm foam supporting up to 400 pounds for heavy individuals. So foam weight capacity varies, low-density foam holds less, high-density foam holds more, with typical seating foam supporting 150 to 250 pounds per cushion, mattress foam supporting 200 to 300 pounds per person, and high-density foam supporting up to 400 pounds, requiring proper density for weight.