ISO 307:2007
Plastics - Polyamides - Determination of viscosity number
- Standard No.
- ISO 307:2007
- Release Date
- 2007
- Published By
- International Organization for Standardization (ISO)
- Status
- Replace By
- ISO 307:2007/Amd 1:2013
- Latest
- ISO 307:2019
- Scope
- This International Standard specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents. Polyamide samples must be completely soluble in the solvents mentioned. Additives such as flame-retardants and modifiers often interfere with the viscosity measurement, having an increasing effect on the viscosity number in formic acid and a decreasing effect on the viscosity number in sulfuric acid. The extent of the effect for polyamide compounds depends on the additive, the quantity of the additive, the presence of other additives and the compounding conditions. For pure polyamides or polyamides containing additives that do not interfere with the viscosity measurement, the determination of the viscosity number of a polyamide provides a measure of the molecular mass of the polymer. The viscosity number of pure polyamides or polyamides which contain additives that do not interfere with the viscosity measurement can be converted from one solvent to another. The viscosity number of polyamides containing additives that do interfere with the viscosity measurement is specific to the solvent used and the material composition. In this case, the measured viscosity number cannot be converted from one solvent to another. 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 1874-1, 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 International Standard.
ISO 307:2007 Referenced Document
- ISO 1042 Laboratory glassware - One-mark volumetric flasks
- ISO 15512 Plastics — Determination of water content*， 2019-04-30 Update
- ISO 1628-1 Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 1: General principles*， 2021-01-31 Update
- ISO 1874-1 Plastics - Polyamide (PA) moulding and extrusion materials - Part 1: Designation system and basis for specification*， 2010-11-15 Update
- ISO 3105 Glass capillary kinematic viscometers - Specifications and operating instructions
- ISO 3451-4 Plastics — Determination of ash — Part 4: Polyamides*， 2024-01-01 Update
- JIS K 6920-2:2000 Plastics -- Polyamide (PA) moulding and extrusion materials -- Part 2: Preparation of test specimens and determination of properties
ISO 307:2007 history
- 2019 ISO 307:2019 Plastics — Polyamides — Determination of viscosity number
- 2013 ISO 307:2007/Amd 1:2013 Plastics - Polyamides - Determination of viscosity number - Amendment 1: Corrections, and update to reference to JIS K 6920-2
- 2007 ISO 307:2007 Plastics - Polyamides - Determination of viscosity number
- 2003 ISO 307:2003 Plastics - Polyamides - Determination of viscosity number
- 1994 ISO 307:1994 Plastics - Polyamides - Determination of viscosity number
- 1984 ISO 307:1984 Plastics; Polyamides; Determination of viscosity number
- 1977 ISO 307:1977 Plastics — Determination of viscosity number of polyamides in dilute solution
