Mooney Viscometer Mk III | Wallace Instruments
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Mooney Viscometer Mk III

V3 Mooney Viscometer Mk III (formally Negretti Automation)
  • Simple mechanical system producing reliable results
  • Precise digital temperature control
  • 4 models to suit differing requirements & budgets Automatic operation and data recording

The Mooney Viscometer Mk III measures and records the viscosity of natural, synthetic or compounded rubber.

Download the datasheet

Conforming to international standards, the Mk III is a shearing-disc viscometer in which the rubber sample is compressed pneumatically in a cylindrical chamber formed by cavities in 2 opposing dies.

The viscosity is determined by measuring the torque required to turn the rotor inside the chamber, heated to a set temperature. As the rotor shears the sample, a torque reaction is transmitted through a worm shaft, which deflects a torsion beam. A dial gauge (analogue or digital) measures the beam’s displacement.

With its simple mechanical drive system and well-proven design, the Mk III has been in use for many years and has become the benchmark viscometer for thousands of laboratories.

Two versions are offered:
V3/2 All digital output including PC interface
V3/3 As V3/2 with 24 character column printer

Standard accessories

Large and small diameter rotor, set of tools
Optional Accessories
Calibration Kit, S1 Specimen Cutting Press, air compressor, calibrated butyl rubber for rapid check of viscometer


LED screen 2 line, 20 character back-lit display housed in control panel
Controls 3 sealed switches with integral LED indicators
Gauge 0.0 - 0.5 ̋ range. 0.0005 ̋ resolution
Dimensions (mm) 810 (h) x 510 (w) x 460 (d)
Weight 127 Kg
Die heating
Temp. range
By elements to upper and lower platens. 700W per element
80 - 150°C ( ±0.1°C)
Max. torque Cut out at 200 Mooney points
Die closure By pneumatic cylinder
Air line pressure 80 psi or 5 bar maximum
Pressure controls Twin controls for platen closure and test routine
Standards ASTM D1646, ISO 289-1


Product range

SKU Name Add to quote
WAV3/2 V3/2 Mooney Viscometer Mk III all digital output including LCD display
WAV3/3 V3/3 Mooney Viscometer Mk III with 24 column printer

Learn More: UKAS 17025 Calibration

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