BS 2782-7.733A(1996) : 1996 AMD 9928

Committees responsible
National foreword
method
1 Scope
2 Normative references
3 Definitions
4 Principle
5 Reagents and materials
6 Apparatus
7 Preparation of test samples
8 Calculation of mass test portion
9 Selection of solvent
10 Procedure
11 Expression of results
12 Repeatability and reproducibility
13 Interconversion of the viscosity numbers determined in
    different solvents and interconversion of viscosity numbers
    determined in 96% sulfuric acid and relative viscosities
    determined in accordance with ASTM D 789
14 Test report
Annex
A (normative) Determination of the concentration of commercial
    sulfuric acid (95% to 97%) and adjustment to 96,0%
Tables
1 Determination of additives in polyamide samples in order to
    be able to calculate the correct test portion size
2 Repeatability and reproducibility
3 Interconversion of relative viscosity (RV) and viscosity
    number (VN) for PA 6 and PA 66
Figures
1 Ubbelohde viscometer
2 Calibration lines for the interconversion of the viscosity
    numbers of PA 6, PA 66, PA 69 and PA 610 in 90% (m/m) formic
    acid solution and in 96% (m/m) sulfuric acid solution
3 Calibration line for the interconversion of the viscosity
    numbers of PA 612 96% (m/m) sulfuric acid solution in
    m-cresol
4 Interconversion of relative viscosity and viscosity number
    for PA 6 and PA 66

Gives a method for determining the viscosity number of dilute solutions of polyamides in certain specified solvents. Applies to PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12 and PA MXD6, in addition to copolyamides and other polyamides that are soluble in one of the specified solvents under specified conditions. Does not apply to polyamides produced by anionic polymerization of lactams or produced with crosslinking agents. BS AMD 9928 RENUMBERS THIS STANDARD