BS ISO 506:2020 pdf free.Rubber latex, natural, concentrate一Determination of volatile fatty acid number.
BS ISO 506 1 Scope This document specifies a method for the determination of the volatile fatty acid number of natural rubber latex concentrate. The method is not necessarily suitable for latices from natural sources other than Hevea brasiliensis and is not applicable to compounded latex, vulcanized latex, artificial dispersions of rubber or synthetic rubber latices.2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 123, Rubber latex一Sampling ISO 124, Latex, rubber一Determination of total solids content ISO 126, Natural rubber latex concentrate一Determination of dry rubber content.number of grams of potassium hydroxide equivalent to the volatile fatty acids in latex concentrate containing 100 g of total solids Note 1 to entry: If the substances have been added to the latex which produce volatile acids on acidification with sulfuric acid, the volatile fatty acid number is high and does not represent the volatile fatty acid content without correction. A test portion is coagulated with ammonium sulfate and a portion of the resultant serum is separated and acidified with sulfuric acid. The acidified serum is steam-distilled and the volatile acids present in the test portion are determined by titration of the distillate with a standard volumetric barium hydroxide solution.During the analysis, use only reagents of recognized analytical quality and only distilld water or water of equivalent purity.BS ISO 506 pdf downlaod.