Hi,
I PM' ed you. All mattresses must meet the strict fire codes in some way and most use chemicals. Hastens claims to use sea water, Mcroskey has their barrier and there are several mattresses that can only be purchased at medical supply with a doctors prescription. Several latex mattress companies make the claim that latex is "naturally" fire retardant, but these are also the companies that claim latex is "natural". Latex is about as natural as a Tang and Twinkie breakfast.