Halox CW-291 Calcium borosilicate Halox Functional pigment >> Anti-corrosive Corrosion inhibitor Alkyd Resins Epoxy Resins Coatings >> Solvent-Free/ High-Solids Metal Corrosion Inhibiting Pigments HALOX® CW-291 Borosilicate Medium Oil Alkyds Long Oil Alkyds High Solids Alkyds Epoxy Esters Alkyd Gloss Topcoats Direct-to-Metal Finishes Borosilicate. Used as a corrosion inhibitor for medium and long oil alkyds, high solids alkyds, epoxy esters, alkyd gloss topcoats and direct-to-metal finishes.