ISO 3219:1993 pdf download.Plastics一Polymers/resins in the liquid state or as emulsions or dispersions一Determination of viscosity using a rotational viscometer with defined shear rate
1 Scope
ISO 3219:1993 pdf download specifies the general pnnciples of a method for determining the viscosity of polymers and resins in the liquid, emulsified or dispersed state, including polymer dispersions, at a defined smear rate by means of rotational viscometers with standard geometry.
Viscosity determinations made in accordance with this standard consist of establishing the relationship between the shear stress and the shear rate. The results obtAined with different instruments in accordance with this standard are comparable and apply to controlled shear as well as controlled stress instruments.
2 Normative reference
The following standard contains provisions which, through reference in this text, constitute provisions of this international Standard. At the time of pubhcation, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Mernbers of IEC and ISO maintain registers of currently valid international Standards.
ISO 291:1977, Plastics — Standard atmospheres for conditioning and testing.
3 Principle
The viscosity of a fluid sample is measured using a rotational viscometer with defined charactenstics, which permits the simultaneous measurement of the shear rate used and the shear stress applied.
4.1.1 Measuring system
The measuring system shall consist of two rigid,symmetrical, coaxial surfaces between which the fluid whose viscosity is to be measured is placed. One of these surfaces shall rotate at a constant angular vel-ocity while the other remains at rest. The measuning system shall be such that the shear rate can be de-fined for each measurement.
A torque-measuring device shall be connected to one of the surfaces, thus permitting determination of the
torque required to overcome the viscous resistance of the flund.
Sutable measunng systems are coaxial-cylinder sys-tems and cone-and-plate systems, among others.
The dimensions of the measuring system shall be so specified as to satisfy the conditions specified in an-nexes A and B, which are designed to ensure a ge-ometrically similar flow field for all types of measurement and all common types of basic instru-ment.
4.1.2 Basic instrument
The basic instrument shall be designed to permit alternative rotors and stators to be fitted, for the gen-eration of a range of defined rotational frequencies (stepwise or continuously vanable), and for measuring the resulting torque, or VICe versa (i.e. generation of a defined torque and measurement of the resulting rotational frequency).ISO 3219 pdf download.