BS ISO 9298:2016 pdf free
BS ISO 9298:2016 pdf free.Rubber compounding ingredients一Zinc oxide一Test methods
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 787-2, General methods of test for pigments and extenders一Part 2: Determination of matter volatile at 105 degrees C
ISO 787-4, General methods of test for pigments and extenders一Part 4: Determination of acidity or alkalinity of the aqueous extract
ISO 787-7, General methods of test for pigments and extenders一Part 7: Determination of residue on sieve一Water method一Manual procedure
ISO 787-8, General methods of test for pigments and extenders一Part 8: Determination of matter soluble in water一Cold extraction method
ISO 1124, Rubber compounding ingredients一Carbon black shipment sampling procedures
ISO 18852, Rubber compounding ingredients一Determination of multipoint nitrogen surface area (NSA) and statistical thickness surface area (STSA)
Surface- coated zinc oxides shall be evaluated by the methods specified in Table 1.
This evaluation shall be done without prior calcination or extraction, since there is little purpose in determining volatile-matter content, content of water-soluble matter or acidity if the coating is removed.
Standard solutions for the metals to be determined in each zinc oxide sample may be prepared from pure metals or metallic compounds, or purchased from a chemical supply house as standard solutions.
The usual concentration of such solutions is 1 μg of the metal per cubic centimetre of solution. Suitable dilutions with water brings these solutions into the linear working range of the spectrometer (B.3.7).
It is recommended that standards below 1 ug/cm3 be prepared fresh, while those at 1 μg/cm3 or above may be stored in plastic bottles (B.3.6).
Care shall be taken to ensure that all samples, and the standards used with them, contain the same concentration of acid(s).
Variations in the mass of the test portion and the final volume of the solution are left to the discretion of the analyst, and shall be determined by prior knowledge of the approximate amounts of lead, cadmium,copper and manganese in the type of zinc oxide being analysed.
Carry a blank through the entire procedure, using the same quantities of reagents but without a test portion. Subtract any positive blank value, in an appropriate manner, before calculating the lead,cadmium, copper or manganese content of the zinc oxide.BS ISO 9298 pdf free.
