EN45545 2, a safety proof for firesleeve

www.firesleeve...
As you know, most materials may release harmful gas or toxicity against high temperature. Fire sleeve is very typical to work for high temperature application. So, before we decide to buy firesleeve, is it better if we can tell whichever offers a safe one?
Before we go deeper for this question, I would like to introduce a certification first. We all know that European Union is leading in setting regulations and standards to protect the mankind. EN45545-2 is one of the many EU Safety Standards. What is it about?