... a waterproof network structure called hydrophobic film, which prevents water form penetrating, but does not affect permeability to gases ... and water vapour.WP03(E) has the following advantages,compared with WP01N:A. Be neutral, but WP01N is strongly alkaline , ... contain much dimethyl siloxane, is better of water repellent effect than WP01N. Water absorption rate of building material after using. WP03 ...