BS ISO 8332:2018 pdf download – Rubber compounding ingredients — Sulfur — Methods of test This document specifies methods of test for determining the main physical and chemical properties of sulfur used for compounding dry rubber. Several of these properties can be determined by more than one test method and the user can choose the most appropriate method following the description of the test method principles provided under the corresponding clauses. NOTE Typical levels for the relevant properties of sulfur for use as a rubber compounding ingredient are contained in Annex A, for information only. 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 565, Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings ISO 3704, Sulphur for industrial use — Determination of acidity — Titrimetric method ISO 3705, Sulphur for industrial use — Determination of arsenic content — Silver diethyldithiocarbamate photometric method ISO 4793, Laboratory sintered (fritted) filters — Porosity grading, classification and designation ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at https://w w w.electropedia.org/ 4 Physical and chemical properties After sampling with a stainless-steel sampling tool in accordance with ISO 15528, the physical and chemical properties of sulfur used as a rubber compounding ingredient shall be determined by the following test methods. 5 Determination of total sulfur content 5.1 Principle The sulfur in a test portion is first converted to thiosulfate, to which an excess volume of iodine solution is added, then determined by back titration with a sodium thiosulfate solution. 5.2 Reagents During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. 5.2.1 Sodium sulfite solution, 50 g/dm 3 . Dissolve 50 g of anhydrous sodium sulfite in 1 dm 3 of water. 5.2.2 Standard volumetric iodine solution, c(l 2 ) = 0,05 mol/dm 3 , freshly prepared and standardized. 5.2.3 Standard volumetric...
Download Address
Download