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BS EN ISO 307:2019

BS EN ISO 307:2019

$167.15

Plastics. Polyamides. Determination of viscosity number

Published By Publication Date Number of Pages
BSI 2019 44
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This document specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents.

The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 16396-1, as well as to copolyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions.

The method is not applicable to polyamides produced by anionic polymerization of lactams or produced with cross-linking agents; such polyamides are normally insoluble in the specified solvents.

The viscosity number is determined by the general procedure specified in ISO 1628-1, observing the particular conditions specified in this document.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principle
5 Reagents and materials
5.1 Solvents and reagents
12 5.2 Cleaning liquids
6 Apparatus
13 7 Preparation of test samples
7.1 General
14 7.2 Samples containing less than 98 % (by mass) polyamide
8 Calculation of test portion
9 Selection of solvent
15 10 Procedure
10.1 Cleaning of the viscometer
10.2 Preparation of test solution
10.2.1 General
10.2.2 Volumetric method
16 10.2.3 Volumetric method, in exact relation to the polymer content
10.2.4 Gravimetric method, in exact relation to the polymer content
17 10.3 Measurement of flow times
18 11 Expression of results
19 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
21 Annex A (informative) Determination of the concentration of commercial sulfuric acid(95 % to 98 %) and adjustment to 96 % by titration
24 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
26 Annex C (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by titration
28 Annex D (informative) Determination of the concentration of commercial formic acid and adjustment to 90 % by density measurement
31 Annex E (informative) Relationship between the viscosity number determined in 96 % (by mass) sulfuric acid solution and the viscosity determined in various solvents
43 Bibliography

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BS EN ISO 307:2019
$167.15