In the Norma Reloading Manual Vol 2 there is an interesting section on the composition of smokeless powder. It is written by Sven-Eric Johansson, Eurenco/Bofors.Do you believe that a silencer is filled with some special chemical that makes it work? And this special chemical attracts water?
A silencer doesn't use anything in it that makes water drawn to it.
While in Vegas I was shooting a silencer equipped rifle, and it is the simplest thing in the world. No wizardry, no chemicals, nothing like that at all. Actually the only thing that surprises me is why people don't make their own. Some basic fabrication skills, a few tools, and go for it. I was amazed at how simplistic they are, not how complex.
Within this section is explained the manufacturing of Ball and Extruded powder, the effects of heat plus the effects of relative humidity.
From page 110 I quote "When the powders burn, the main reaction products are carbon monoxide, carbon dioxide, water and nitrogen".
Water is the second highest reaction product after carbon monoxide.
For those interested I do recommend buying a copy of this book.
So @Small Lady no "special chemical", just the chemicals most of us are aware of.