BS EN ISO 307:2019

What is ISO 307 - Determination of viscosity number of polyamides about?

ISO 307 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 co-polyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions.

ISO 307 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.

Note: ISO 307 is applicable for production control and intra-product comparison even if the polyamide contains additives that do interfere with the viscosity measurement. However, it should be realized that deviations of the viscosity number can be caused by either the polyamide itself, effects caused by the additives present, or a combination of these.

Who is ISO 307 - Determination of viscosity number of polyamides for?

ISO 307 on the determination of viscosity number of polyamides is useful for:

• Manufacturers of thermoplastics
• Quality control and testing authorities

Why should you use ISO 307 - Determination of viscosity number of polyamides?

ISO 307 specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents. The determination of the viscosity number of a polyamide provides a value that depends on the molecular mass of the polymer, but does not strictly correlate with the molecular mass. Additives such as flame-retardants and modifiers often interfere with the viscosity measurement and may have an increasing effect on the viscosity number in one solvent and a decreasing effect in another solvent. The extent of the effect depends among others on the additive, the quantity of the additive, the presence of other additives and reactions.

This test method is applicable for production control and intra-product comparison even if the polyamide contains additives that do interfere with the viscosity measurement.

Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave when used in various end-applications and under various conditions, without leading to product failure.