This British Standard is an adoption of an ISO standard. You can access the ISO version here.
Both synthetic and natural polymers have essential uses in everyday life because of their broad spectrum of properties.
ISO 1628-5 specifies a method for the determination of the viscosity number of dilute solutions of TPs in certain specified solvents. The method applies to poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly-(cyclohexylenedimethylene terephthalate) (PCT), and poly(ethylene naphthalate) (PEN), as well as to copolyesters and other polyesters, defined in ISO 77921, that are soluble in one of the specified solvents under the specified conditions.
ISO 1628-5 on the viscosity of polymers using capillary viscometers is useful for manufacturing companies associated with:
Polymers with larger molecular sizes have a higher molecular weight which provides higher viscosity. The viscosity number of a polymer is determined by the general procedure specified in ISO 16281, observing the particular conditions specified in ISO 1628-5. The determination of the viscosity number of a thermoplastic polyester provides a measure of the relative molecular mass of the polymer.
ISO 1628-5 provides the test method of determining the viscosity of polymers. This includes:
The guidelines in ISO 1628-5 help you determine the viscosity of polymers for choosing the right material for industrial purposes, so that end customers can use superior quality products.