I am from Vietnam, and I would like to buy1. Naphthalene Formaldehyde Sulfornate2. Lignin Sunfonat3. Poly CacboxylateCould you send me the price list and the sample?Moreover can u send me the methods to prevent dregs and smell. I am going to produce concrete whose Mpa is 150-800.Otherwise, it is so nice if u give me some advice to produce admixture.Country:Vietnam
