MDI-reduced foams and MDI-free foams with a silane base
An isocyanate-reduced foam is a foam whose concentration of the reactive MDI (= Methylene diphenyldiisocyanate = free isocyanates) has been reduced. These foams are divided into two groups:
A) < 1% monomer level:
The level of free MDIs in these foams has been reduced to a value below 1 %.
B) < 0.1% monomer level:
The MDI level in these foams has been reduced to a value of < 0.1 % of free MDIs.
MDI-free foams with a silane base
These are assembly foams that have a polyurethane structure but no more free isocyanate groups because they were turned into a non-reactive urethane structure in a previous chemical process. The foam hardening process is based on reaction-capable silane groups that, once the foam has left the can, react with the ambient moisture leading to the interconnection and therefore the hardening of the applied PU foam.