Explanatory notes
… mixed together or with metallic binders 3824.40 - Prepared additives for cements, mortars or concretes 3824.50 - … carbonate, sodium silicate, tannin, etc. These compounds, added to hard water, precipitate most of the dissolved … circulates. (16) Oxylith (or oxygen stone), prepared by adding small quantities of products such as copper or nickel …