This part of ISO 3451 specifies three methods for the determination of the ash of poly(vinyl chloride). The general procedures given in ISO 3451-1 are followed. For ash, method A is used. For sulfated ash, methods B and C are used. All three methods are applicable to resins, compounds and finished products. Methods B and C are applicable when lead-containing compounds are present.<\/p>\n
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| 5<\/td>\n | TitlePage – Plastics\ufffd\u2014 Determination of ash\ufffd\u2014 <\/td>\n<\/tr>\n | ||||||
| 7<\/td>\n | Foreword – Foreword <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | Scope – 1\ufffd\ufffd\ufffd Scope NormativeReference – 2\ufffd\ufffd\ufffd Normative reference Clause1 – 3\ufffd\ufffd\ufffd Principle Subclause2 – 3.1\ufffd\ufffd\ufffd Method\ufffdA (direct calcination) Subclause2 – 3.2\ufffd\ufffd\ufffd Method\ufffdB (calcination, with sulfuric acid treatment after combustion) Subclause2 – 3.3\ufffd\ufffd\ufffd Method\ufffdC (calcination, with sulfuric acid treatment before combustion) <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | Clause1 – 4\ufffd\ufffd\ufffd Reagents (for methods B and C only) UntitledSubclause2 – 4.1\ufffd\ufffd\ufffd Sulfuric acid UntitledSubclause2 – 4.2\ufffd\ufffd\ufffd Acetic acid Clause1 – 5\ufffd\ufffd\ufffd Apparatus UntitledSubclause2 – 5.1\ufffd\ufffd\ufffd Crucible of silica UntitledSubclause2 – 5.2\ufffd\ufffd\ufffd Bunsen burner UntitledSubclause2 – 5.3\ufffd\ufffd\ufffd Muffle furnace UntitledSubclause2 – 5.4\ufffd\ufffd\ufffd Pipettes UntitledSubclause2 – 5.5\ufffd\ufffd\ufffd Desiccator UntitledSubclause2 – 5.6\ufffd\ufffd\ufffd Analytical balance UntitledSubclause2 – 5.7\ufffd\ufffd\ufffd Weighing bottles Clause1 – 6\ufffd\ufffd\ufffd Safety precautions UntitledSubclause2 – 6.1\ufffd\ufffd\ufffd Always wear safety glasses when working in the laboratory. UntitledSubclause2 – 6.2\ufffd\ufffd\ufffd Exercise all normal safety precautions when working with an open flam… UntitledSubclause2 – 6.3\ufffd\ufffd\ufffd Carry out the heating of the sample in a fume cupboard, and for calci… UntitledSubclause2 – 6.4\ufffd\ufffd\ufffd Read carefully and follow strictly the instructions in the warnings a… Clause1 – 7\ufffd\ufffd\ufffd Procedure Subclause2 – 7.1\ufffd\ufffd\ufffd Test portion <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | Subclause2 – 7.2\ufffd\ufffd\ufffd Method\ufffdA (determination of unsulfated ash) UntitledSubclause3 – 7.2.1\ufffd\ufffd\ufffd Heat the clean crucible and lid ( UntitledSubclause3 – 7.2.2\ufffd\ufffd\ufffd Introduce into the crucible a suitable quantity of sample (see UntitledSubclause3 – 7.2.3\ufffd\ufffd\ufffd Heat the crucible directly on the heating device ( UntitledSubclause3 – 7.2.4\ufffd\ufffd\ufffd Partially close the crucible with the lid so that the volatile matt… UntitledSubclause3 – 7.2.5\ufffd\ufffd\ufffd Remove the crucible with lid from the furnace, place it in the desi… UntitledSubclause3 – 7.2.6\ufffd\ufffd\ufffd Calcinate again, under the same conditions, until constant mass is … Subclause2 – 7.3\ufffd\ufffd\ufffd Method\ufffdB (determination of sulfated ash) UntitledSubclause3 – 7.3.1\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.3.2\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.3.3\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.3.4\ufffd\ufffd\ufffd After allowing the crucible and contents to cool, add concentrated … UntitledSubclause3 – 7.3.5\ufffd\ufffd\ufffd If, after allowing the crucible to cool, carbon is still evident, a… UntitledSubclause3 – 7.3.6\ufffd\ufffd\ufffd Place the crucible at the entrance of the muffle furnace ( <\/td>\n<\/tr>\n | ||||||
| 12<\/td>\n | Subclause2 – 7.4\ufffd\ufffd\ufffd Method\ufffdC (determination of sulfated ash) UntitledSubclause3 – 7.4.1\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.4.2\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.4.3\ufffd\ufffd\ufffd Using a pipette, add drop by drop the minimum possible quantity of … UntitledSubclause3 – 7.4.4\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.4.5\ufffd\ufffd\ufffd Proceed as detailed in UntitledSubclause3 – 7.4.6\ufffd\ufffd\ufffd Proceed as detailed in Clause1 – 8\ufffd\ufffd\ufffd Number of determinations Clause1 – 9\ufffd\ufffd\ufffd Expression of results Clause1 – 10\ufffd\ufffd\ufffd Accuracy and precision <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | Clause1 – 11\ufffd\ufffd\ufffd Test report <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" Plastics. Determination of ash – Poly(vinyl chloride)<\/b><\/p>\n |