Polymer C-Syn Crowley Chemical Moisture Scavengers ADHESIVE How does Polymer C-Syn improve wax formulations? Polymer C-Syn is an invaluable additive where moisture resistance is particularly important, because it enhances MVTR at the creases or folds of fiberboard. What waxes is it compatible with? Polymer C-Syn is compatible with paraffin and microcrystalline waxes. Is it approved as a food packaging adhesive? Yes. Polymer C-Syn meets FDA Regulation 21 CFR 175.105. Polymer. Possesses good compatibility with paraffin and microcrystalline waxes. Used as an additive where moisture resistance is particularly important. Enhances MVTR at the creases or folds of fiberboard. Used in food packaging adhesives.