"Silbond" H-6 is compatible with a variety of fillers, such as refined clays, diatomaceous silica, refined asbestos, and neutral talcs. Any material considered for a filler should be essentially neutral and anhydrous. A change in pH or additional H2O will tend to hydrolyze the binder and lower the shelf life of the vehicle component. Pigments of the iron, chromium, or other oxide variety should be added to the zinc component. Oxides in the presence of water may upset the pH of the binder and cause hydrolysis.