Viscometry
Capillary viscometry is considered as the most
accfurate method for the determination of
the kinematic viscosity of Newtonian liquids.
accfurate method for the determination of
the kinematic viscosity of Newtonian liquids.
Capillary viscometry is considered as the most accurate method for the determination of the viscosity of Newtonian liquids. By this technique the time is measured a certain volume needs to flow through a capillary of defined dimensions. The meniscus is detected by means of light barriers, enabling the precise determination of the flow time.
In the field of polymer chemistry capillary viscometry is used to determine the viscosity number, the K-value and the intrinsic viscosity. By means of these data the molecular mass can be determined, which is one of the most important values to characterize polymers.
Measure:
(Fikentscher) K-value
Relative change of viscosity, specific viscosity
Methods:
DIN EN ISO 1157 | Determination of the number of viscosity and viscosity ratio: Celluloseacetate in delute solution (Dichlormethane/Methanol) at 25°C |
DIN EN ISO 1628/1-6 | Determination of the viscosity of polymers in delute solution using a capillary viscosimeter: Part 1: general basics Part 2: Polyvinylchloride (PVC) in Cyclohexane at 25°C Part 3: Polyethylene (PE) und Polypropylene (PP) in Decahydronaphthaline at 135°C Part 4: Polycarbonate (PC) in Dichlormethane at 25°C Part 5: Polyethylenterephtalate (PET) in m-Kresol, Phenole/1,2-Dichlorbenzene, Phenoe/1,1,2,2-Tetrachlorethane, o-Chlorphenole, Dichloroacetic acid at 25°C Part 6: Polymethylmethacrylate (PMMA) in Chloroform at 25°C |
ISO 307 | Determination of the number of viscostiy for polyamides in sulfuric acid, formic acid, m-Kresol, Phenole, 1,1,2,2-Tetrachlorethane or phosphoric acid at 25°C |
SNV 195 598 | Determination of the number of viscostiy of cellulose in EWN-solvent. |
ASTM D4603 | Determining Inherent Viscosity of PET by Glass Capillary Viscometer |
ASTM 5525 | Measuring solution viscosity of Polymers with a Differential Viscometer |
The measurements can be adjusted to the requirements of the customers, e.g. choice of the solvent or temperature. We possess a large databank of Kuhn-Mark-Houwink-parameters,enabling in many cases the transformation of the Intrinsic viscosity into molecular weights.
If you do not find your desired test method, please do not hesitate to contact us!