Gehman Tester, ET 02-II

Gehman Tester, ET 02-II, for determination of the relative stiffness characteristics of vulcanized or thermoplastic rubbers, also called the Gehman procedure. The test is done according to ISO 1432, ASTM D1053, or equivalent standards.

The Elastocon Gehman Tester has 6 test stations, is computerized and performs the test automatically.

The computer controls both the temperature rise and measures the torsion angle of the samples. The results are displayed in a graph and RM2, RM5, RM10 and RM100 values are calculated. The result can also be presented as a table.

We recommend the automatic cooling system with liquid nitrogen that can be supplied.

Another useful option is the ET 04 freezer for precooling of the cooling media (usually ethanol), during nights or other times when the instrument is not in use. If the cooling media is pre-cooled, the amount of liquid nitrogen necessary to start the test will decrease remarkably.


The Gehman Tester performs well inside the apparatus requirements in ISO 1432 and ASTM D1053.

Temperature control

  • Temperature range: -80 °C to +20 °C
  • Accuracy: ± 0,5 °C
  • Resolution: ± 0,1 °C
  • Sensor: Pt 100, 1/3 DIN

Angle measurement

  • Indicators: 6 pc digital encoders
  • Resolution: 0,2°
  • Measuring range: adjustable from 0–182°, adjusted at 0–180°

Important specifications

  • The rig is raised with the help of a pneumatic cylinder
  • Temperature controller with 0,1 °C setpoint and RS232 interface
  • Solid state relay for safe control
  • Temperature sensor close to the samples
  • Run-time meter (PLC)
  • The casing consists of steel, painted with epoxy paint

Included accessories with ET 02-II

  • 3 sets with 6 wires in each set for different stiffness (0.7, 2.8, 11.2 mNm)
  • Computer (Windows)
  • EC 12 software for the Gehman test
  • Support agreement 12 months
  • Manual in English
  • Necessary tools (e.g. stylus pen for PLC touch screen)
  • Accredited calibration including certificate

Options for ET 02-II

  • ET 01.02 – Automatic cooling with liquid nitrogen
  • ET 02.02 – Extra torsion wire for Gehman, 0.7, 2.8 or 11.2 mNm
  • ET 02.03 – Grips for ASTM D1053 method B
  • ET 01.08 – Adjustable table
  • ET 04 – Ultra low temperature freezer -85 °C
  • EA 01 – Silent air compressor, 105 l/min – Read more about EA 01 here

More information

Download product brochure: Elastocon Low Temperature Testers.pdf

Watch our video about the Gehman Tester: