I don't know who manufactures Yarvex, other thay KFY and MFY; the original article is not strictly faction specific. It only states that Yarvex was first used by KFY. Whether or not Yarvex Foam has a specific manufacturer depends on how much of an 'original' invention you would consider it; to me, it seems to be an obvious extension of Yarvex Mesh. If KFY (and now MFY) are the only factions that have the ability to manufacture Yarvex Mesh, then they would be the only ones with the ability to manufacture Yarvex Foam.
Yarvex Foam differs from Yarvex Mesh only in that the individual Yarvex strands are arranged in a volumetic 3D matrix rather than a layered 2D mesh. It isn't actually a new 'material,' just layers of yarvex interwoven three-dimensionally. Because Yarvex can be woven with fine enough grain to become impermeable, it would logically have a foam-like consistency because of trapped gas or vaccum pockets.
I wanted to confirm that such a thing was acceptable/possible. I also wanted to find out of it was acceptable to add some detail to the largely undescribed maufacturing process of all Yarvex, such that:
-Yarvex strands are manufactured using scalar fields
-Yarvex strand length can be adjusted using scalar fields
This would A) clarify how yarvex is made, and B) allow yarvex strands in certain configurations to have some limited 'active' properties.
Edit: I've edited the description with a name for the inventor and a note that there are no current manufacturers, under the assumption that this would be modified manufacturing process that has not yet been explored by MFY or KFY. If it is decided that this would not be the case, then both of these would need to be changed.