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.
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The Elastocon Gehman tester has 6 test stations, is computerized and performs the test automatically.
The EC 18 Windows application, which is a part of the Gehman tester, helps the user setup and run the test and will continuously display the results in a graph. The application ramps the temperature, twists the test pieces in intervals, and measures the torsional angle, and finally stops the test once the torsional angle is small enough.
The application can be used to view and compare multiple tests and produce reports as defined by the standards, with results such as RM2, RM5, RM10 and RM100 presented. The results can also be exported, so that they can be opened in a spreadsheet application, for example.
We recommend the addition of our automatic cooling system with liquid nitrogen, ET 01.02. Read more about ET 01.02 here.
Pre-cooling of the cooling media will drastically reduce the amount of liquid nitrogen required. We recommend the ET 04 freezer for this purpose. Keep an extra batch of cooling media in the freezer to always be ready to make a new test. Read more about the ET 04 freezer here.
Standards
- ISO 1432
- ASTM D1053
- other equivalent standards
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
- EC 18 software – Required for using ET 02‑II
- The rig is raised with the help of a pneumatic cylinder
- PLC with touch screen for real-time control of the instrument
- Temperature controller with 0,1 °C setpoint and RS232 interface
- Solid state relay for safe control
- Temperature sensor close to the samples
- The casing consists of steel, painted with epoxy paint
Included with ET 02-II
- 3 sets with 6 wires in each set for different stiffness (0.7, 2.8, 11.2 mNm)
- Computer (Windows)
- Support agreement 12 months
- Manual in English
- Stylus pen for the instrument touch screen
- Accredited calibration including certificate
Options for ET 02-II
- ET 01.02 – Automatic cooling with liquid nitrogen – Read more about ET 01.02 here
- 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 – Read more about ET 01.08 adjustable table here
- ET 04 – Ultra low temperature freezer -85 °C – Read more about the ET 04 freezer here.
- EA 01 – Silent air compressor, 105 l/min – Read more about EA 01 here
More information
Product brochure: Elastocon – Low temperature testers.pdf
Watch Elastocon's video about the Gehman tester:
