You can, either by transforming some of the items you have (possible with off-line Minerva) or by adding another item to your inventory (you'll need on-line version for that).
Follow the main
guide , go to characters=>PC=>inventory
If you are using on-line .minerva copy one of the numbered objects and paste it into the same category; remember that without Cargobot or Smuggler perk you can't have more than 10 positions in your inventory, each of those add another two. Change its name to a different number; change classInatance and shortName of the object to whatever item you need (in your case classes.Items.Miscellaneous::Silicone and Silicone). Then adjust quantity to whatever you need, but remember that most combat consumables stack only up to 5, TF items up to 10, and weapons and armor don't stack at all.
If you use off-line .minerva just do the same without creating a new object.