AS NZS 1301.421 pdf download – Method of test for pulp and paper Method 421: Paper, board and pulps — Determination of pH of aqueous extracts — Cold extraction 5 Reagents 5.1 Water, distilled or deionised water shall be used throughout the test. The conductivity of the water shall not exceed 0,1 mS/m, after boiling for 1 h and cooling...