I have found your website enlightening on the subject of latex and it's many forms, so much so you are top of my selection list...however...
You say...
"Dunlopillo is credited somewhat to be the market leaders in latex mattresses but in recent times, they don’t disclose the blend of their latex leaving it open to scrutiny. "
Dunlopillo Say...
"Our Dunlopillo mattresses are 100% pure latex. Natural Latex is a wonderful material derived from the sap of rubber trees (Hevea Brasiliensis) grown in managed sustainable plantations around the world."
I say
" Who do I believe?"