Accessories for High-Temperature Testing with AllroundLine Testing Machines

Reliable high-temperature testing solutions require optimally matched components. To meet the many standards and customer requirements, ZwickRoell offers a large selection of modular high-temperature components for use with new and pre-owned AllroundLine testing machines, as well as for retrofitting machines from other manufacturers.

ZwickRoell develops and produces complete solutions in a temperature range of +200°C up to 1,600°C for determination of the elastic behavior, resistance, and yield point of high-temperature resistant materials under high heat conditions. Not only the selection of the heating system to be used, but also reliable temperature control with suitable thermocouples, and a high-temperature load string with matching high-temperature extensometer, contribute to the generation of reliable results in high-temperature testing.

Testing system with furnace carousel
Chamber for vacuum and inert gas environment
High-temperature testing system with induction heating
Switching and control unit

Switching and Control System

At the center of every high-temperature test lies exact temperature control along the specimen. The temperature controller developed by ZwickRoell and proven for many years, ensures reproducible and user-independent temperature control of the specimen during every test. The switching and control system meets all requirements of the current international test standards such as DIN EN ISO 204, DIN EN ISO 6892-2, ASTM E139, ASTM E21.

Advantages and features

  • Intelligent control algorithms ensure that the specimen temperature is reached and maintained in compliance with the standards without overshooting, as well as temperature stability along the sample
  • Empirically determined control parameters for different specimen temperatures are no longer necessary
  • Automatic controller setting in a temperature range of 200 °C to 1200 °C
  • Temperature tolerance on specimen, max. parallel length 100 mm:
    - 200°C to 350°C: ± 2K
    - 350°C to 1200°C: ± 1K
  • Digital display of temperatures
  • Suitable for stand-alone operation and PC operation with testXpert II / testXpert III testing software
  • Not tied to specimen thermal element types
Specimen temperature measuring device with variable distance

Specimen Temperature Measuring Device

For exact specimen and furnace temperature control, the use of a suitable specimen temperature measuring device is necessary. Depending on the specimen geometry and the specimen spectrum, fixed or variable measuring devices with different thermal elements (Type K, N, S,...) are used. To ensure constant temperature along the specimen, normally three thermal elements are attached to the surface of the specimen.

Load Strings

Load string for tensile tests

Ceramic load string (left) and metallic (right)

The high-temperature load string consists of:

  • Pull-rod mounting
  • Pull rod
  • Specimen adapter

The high-temperature load string transmits the force from the high-temperature specimen adapters in the furnace to the pull-rod mountings outside the furnace.

Therefore, the pull-rods as well as the specimen adapter must stand up to the particular thermal loads in high-temperature testing. Metallic high-temperature pull-rods are ideal for use up to a max. of 1,200°C and ceramic high-temperature pull-rods up to 1,500°C.

Load string for compression and flexure tests

Load string for compression and flexure tests up to 1,500°C
Compression and flexure tests up to 1,500°C in air are performed with a ceramic load string. The die is typically fixed; the flexure test kit fully articulable to ASTM C1211. With the compression fixture, loads up to approx.10 kN can be applied; the flexure fixture allows loads of approx. 2 kN.

Load string for compression testing with reversal cage

1x1--fo-upm-compression-with-reversal cage
Compression tests can also be performed with a reversal cage. Here the tensile force is converted to compression force through the reversal cage. Compression tests up to 1200°C can be performed in air as well as in vacuum. The benefit of the reversal cage lies in the high stability of the arrangement and low conversion effort from compression to tensile tests.


ZwickRoell offers a comprehensive selection of extension measurement systems with different resolutions, measuring principles, and measurement displacement. A distinction is generally made between contact and non-contact measurement of extension, change in width, or strain. The special requirements in high-temperature testing are taken into account with specially designed extensometers.

Additional interesting applications

Learn more about our customers’ high-temperature applications.