PRODUCTS

Dynamic viscosity

Our accessories

Enhance the capabilities of your Fungilab viscometer with accessories designed for more accurate, versatile and efficient viscosity measurements.

Small Sample Adapter (APM)

APM or small sample adapter and APM/B or small sample adapter without flow jacket consist of an accessory with a cylindrical sample chamber and spindles which allows the user to take accurate viscosity measurements with small volumes. (It is supplied without spindles). Its rheological correct cylindrical geometry allows extremely accurate viscosity measurements and shear rate and shear stress determinations. Stainless steel sample chamber, removable and easily cleaned. Flow jacket that allows thermostatisation of the sample between -10 a +100°C (14 a 212 °F). • Under request: special flow jacket for reaching temperatures above 200°C. Sample volume: from 8 to 13 ml, depending on the spindle used. PT100 probe to determine the sample temperature with accuracy (optional). Applications include:

Casson viscosity of chocolate
Thick film ink
Shampoo
Paint
Printing Ink Varnish

APM

Our viscometers

LABORATORY DIVISION

Dynamic viscosity

Viscosity is part of the science of Rheology which quantifies the resistance materials give to changing shape.

Proper interpretation of viscosity data can reduce the rate of rejects while keeping production and formulation development costs to a minimum. Consistent product quality is ensured through proper viscosity measurements, either alone or in conjunction with compatible tests.

Dynamic viscosity testing can help with:

Material characterization or “finger-printing”
Standard testing methods to check for differences between batches
Indirect way of measuring quality
Product formulation
Quality control
Process control
Design, optimization and operation of process equipment

Material characterization or “finger-printing”

Standard testing methods to check for differences between batches

Indirect way of measuring quality

Product  formulation

Quality  control

Process  control

Design, optimization and operation of process equipment

Viscosity types

Dynamic viscosity

Poise
Centipoise (mPa*s)

Kinematic viscosity

Stokes
Centistokes (mm2/sec)

Apparent viscosity

Poise
Centipoise (mPa*s)

Newton’s Law

According to Newton’s law, the viscosity of a fluid is constant. As shear rate changes, shear stress changes in proportion such that viscosity is constant. Common fluids that exhibit such behavior are:

Unfortunately for us, not all fluids follow Newton’s law. In fact, most fluids do not. For this reason, fluids are classified into two categories:

Rotational Viscometer

The viscosity is calculated from the measured torque and rotational speed, as well as the dimensions of the measuring geometry.
A fluid’s resistance to flow is measured by the torque it exerts on the rotating shaft of the viscometer.

Absolute viscosity: the measuring geometry fulfills certain requirements (which is the case of coaxial spindles).‏

‏Relative viscosity: the dimensions of the measuring geometry are not well defined.

Advantage

Flexibility in:

Application

For Newtonian and non-Newtonian substances and temperatures different from room temperature.