I.S. EN ISO 307:2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Preparation of test samples
8 Calculation of test portion
9 Selection of solvent
10 Procedure
11 Expression of results
12 Repeatability and reproducibility
13 Relationship between the viscosity number determined
   in 96% (by mass) sulfuric acid solution and the viscosity
   determined in various solvents
14 Test report
Annex A (informative) - Determination of the concentration of
                        commercial sulfuric acid (95% to 98%)
                        and adjustment to 96% by titration
Annex B (informative) - Determination of the concentration of
                        sulfuric acid (95% to 98%) and adjustment
                        to 96% by flow time measurement in a small
                        capillary viscometer
Annex C (informative) - Determination of the concentration of
                        commercial formic acid and adjustment to
                        90% by titration
Annex D (informative) - Determination of the concentration of
                        commercial formic acid and adjustment to
                        90% by density measurement
Annex E (informative) - Relationship between the viscosity number
                        determined in 96% (by mass) sulfuric acid
                        solution and the viscosity determined in
                        various solvents
Bibliography

Describes a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents.