I've got a pretty good understanding of how GoreTex works.
I understand that the outside chemical coating effectivly holds water off the outer layer (using little chemical spikes).
But I can't quite seem to find out what the coating on the outside (when new) is? What's it's name or chemical symbols, etc?
the reason I'm asking (and is also a secondary question) is, do the standard replacement products (all of which are not made by GoreTex themselves) contain the same chemical, exactly?