Statements from manufacturers have no validity unless supported by independent analysis. There is another problem. Urine, etc. can cause phosphate to dissolve and accumulate in the mattress, and so provide a source of poisonous gas. Then hazard from the gases is probably greater than that from the fire. I am informed that in Britain, following the forced introduction of fire retardant into cot mattresses, the number of baby and child deaths from fires in mattresses rose sharply.
Boric acid is a toxic compound, and wool normally contains phosphorus.
What is your opinion on infants sleeping with their mothers. OK, so long as the parents' mattress is wrapped. Can your product be used to wrap adult sized beds for when the infant sleeps with the mother or parents. BabeSafe do not make adult size covers, though we have often been asked about them. Since 1995 I have provided a free testing service for parents who wish to check on the quality of polyethylene for mattress-wrapping.