... saving cement, improving cement mobility and workability. FDN is a high range concrete admixture of concrete casting-in-place, prefabricating ... nearly 1 square kilometer, our plant is focused on FDN-A, FDN-B, FDN-C series naphthalene sulfonate formaldehyde condensation ... , R & D and trade, we are a modernized joint-ventures private company, owning a plenty of capital, large manufacturing scale, advanced ...