The chemicals used in making foam mattresses vary depending on the manufacturer and the specific type of foam. However, some of the common chemicals used include:

Polyurethane: This is the most common type of foam used in mattresses. It is made from a reaction between two chemicals: isocyanate and polyol.

Methylene diphenyl diisocyanate (MDI): This is a type of isocyanate used in the production of polyurethane foam.

Toluene diisocyanate (TDI): This is another type of isocyanate used in the production of polyurethane foam.

Polyols: These are compounds that contain multiple hydroxyl groups. They react with isocyanates to form polyurethane.

Water: Water is used as a blowing agent in the production of foam mattresses. It helps create the bubbles that give foam mattresses their distinctive texture.

Additives: Various additives may also be used in foam mattresses, including flame retardants, antimicrobial agents, and dyes.

It's important to note that the specific chemicals used in foam mattresses can vary depending on the manufacturer and the specific type of foam. Some foam mattresses may contain additional chemicals, or may use different types of isocyanates or polyols.