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Viscosity measurements and degradation

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verschiedene Spritzguss-und-Probekörper aus Kunststoff

The flow behavior of plastics is determined by their viscosity. A distinction is made between melt viscosities (MVR / MFR) and solution viscosities, often expressed in viscosity numbers (VZ, IV or VN). Both measurements depend on the chain lengths of the polymers and the test conditions.

Injection molding processing or heat stress during use can lead to a shortening of the polymer chains. Viscosity measurements are used to determine polymer degradation during processing or ageing. Comparative measurements of material before processing (e.g. granulate) and component are always necessary.  
For damage analyses, viscosity measurements are carried out on good and bad parts.

Spiral molds with different wall thicknesses are available at OMPG for investigating the dependencies of the flow path in injection molding on different additives.

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Here you will find a list of all test standards for which we offer services in this area. All currently accredited standards can be found on the Accreditation page in our list of services.

Show test standards for Viscosity measurements and degradation

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Dipl.-Ing. Ute Schwarz
Phone: + 49 3672 379 - 420

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List of test standards for Viscosity measurements and degradation
Bosch standard N28 BN02-GF

Polyamide 66 reinforced with glass fibres
Bosch standard N28 BN07-GF

Polybutylene terephthalate, reinforced with glass fibres (PBT - Ultradur)
DIN 51562-3

Viscometry; determination of kinematic viscosity using the Ubbelohde viscometer; viscosity relative increment at short flow times
DIN 53014-1

Viscosimetry; capillary viscometers with circular and rectangular cross section for determination of flow curves; principles, concepts, definitions
DIN EN ISO 1133-1

Plastics – Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics – Part 1: Standard method

DIN EN ISO 1133-2

Plastics – Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics – Part 2: Method for materials sensitive to time-temperature history and/or moisture

DIN EN ISO 1628-1

Plastics – Determination of the viscosity of polymers in dilute solution using capillary viscometers – Part 1: General principle
DIN EN ISO 1628-5

Plastics – Determination of the viscosity of polymers in dilute solution using capillary viscometers – Part 5: Thermoplastic polyester (TP) homopolymers and copolymers

DIN EN ISO 307

Plastics – Polyamides – Determination of viscosity number

ISO 1628-4

Plastics – Determination of the viscosity of polymers in dilute solution using capillary viscometers – Part 4: Polycarbonate (PC) moulding and extrusion materials