Hi paddyb,
I don’t know one way or the other.
I linked the guidelines in some of my previous replies but they are in post #4 here.
While different types and blends of latex can have different properties and be more or less costly … any type or blend of latex is a durable material and wouldn’t be a weak link in a mattress. There is more about the different types and blends of latex in post #6 here.
Phoenix