Round Robin Rests – Quality Assurance Through Comparative Tests

labXplore - round robin tests determine the quality of the test laboratory

Participation in round robin tests plays a central role in quality assurance and validation of test methods. Round robin tests are proficiency tests, in which different test centers or laboratories perform identical tests to evaluate the accuracy and reproducibility of their test results. They serve to ensure the accuracy of the test results according to international standards.

The organization and performance of these round robin tests has often posed considerable challenges for laboratories: The use of manual processes and external providers is not only time-consuming but also cost-intensive and error-prone.LabXplore, a service from ZwickRoell, is the first cloud-based platform that optimizes the planning, performance and evaluation of round robin tests in the field of mechanical test methods and offers laboratories more flexibility, transparency and safety in quality assurance processes.

Use the ZwickRoell platform labXplore for round robin tests to optimize your test processes, check the suitability of your laboratory and ensure maximum accuracy and quality in materials testing!

How can I participate? Which tests are possible? Advantages of labXplore Video Who must perform round robin tests? Definition of Terms

Would you like to find out more about our digital platform for round robin tests - labXplore or setup a date for a demo?

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How can I participate in round robin testing?

We offer you the opportunity to compare your materials testing machine with the specimen provided by our partners and to participate in our round robin test on labXplore. labXplore is our exclusive round robin testing platform. It's that easy to participate:

Visit our partner website labXplore and register at no charge.
Confirm your email address.
Enter your machine data and take part in a desired round robin test. Our partners will send you the appropriate specimen material.
Perform the test with the specimen received.
Enter your measurement data on the platform and receive an immediate real-time evaluation of your measurement data, directly after registration – no waiting times, no delays.

Which round robin tests are currently possible?

Tensile Test ISO 527-2 (Polycarbonat 2025)

Provided bypolymerphys IK GmbHDIN EN ISO 527-2:2012

-Test material: PC (polycarbonate), Type A1 specimen -You will receive a total of 1 sample set with 7 specimens. One test series consists of 5 individual measurements. The remaining sample material can be used for preliminary tests. -Test speed: 50 mm/min -Modulus measurement speed: 1 mm/min -Measurement length L0: 75 mm Perform five tests and enter the results in labXplore. The results will be available immediately. The evaluation is anonymous; you can only view your own results.

Test Properties

Yield strength
Tensile modulus
Yield strain

90.00 EUR

Charpy impact strength ISO 179-1 (polycarbonate 2025)

Provided bypolymerphys IK GmbHDIN EN ISO 179-1:2023-10

Test material: PC (polycarbonate), test specimen type A1 -You will receive a total of 1 sample set with 15 test specimens. A test series consists of 12 individual measurements. The remaining sample material can be used for preliminary tests. Sample preparation: -A parallel section measuring 80 mm (+- 2 mm) must be cut from each of the type A1 test specimens. -The test specimens must be provided with a type A notch before the test begins. Conditioning & execution: -If possible, store samples for at least 24 hours in a normal climate at (23 ± 2) °C and (50 ± 10) % RH and then test at room temperature -The test should be performed as a narrow-side impact (e). -A pendulum hammer with 4 J of energy should be used. Perform twelve tests and enter the results in labXplore. The results evaluation will then be available to you immediately. The evaluation is anonymous, and you can view your own results in comparison to other participants.

Test Properties

Charpy impact strength

90.00 EUR

Flexural test ISO 178 (polycarbonate 2025)

Provided bypolymerphys IK GmbHDIN EN ISO 178:2019-08

Test material: PC (polycarbonate), test specimen type A1 -You will receive a total of 1 sample set with 7 test specimens. A test series consists of 5 individual measurements. The remaining sample material can be used for preliminary tests. Conditioning & implementation: -If possible, store samples for at least 24 hours in a normal climate at (23 ± 2) °C and (50 ± 10) % RH and then test at room temperature. -Test speed: 100 mm/min -Test speed for modulus measurement: 2 mm/min -Support distance: 64 mm Perform five tests and enter the results in labXplore. The results evaluation will then be available to you immediately. The evaluation is anonymous, and you can view your own results in comparison to other participants.

Test Properties

Biege-E-Modul
Stress at conventional deflection
flexural strength
Elongation at flexural strength

90.00 EUR

HDT heat deflection temperature method A, ISO 75-2 (polycarbonate 2025)

Provided bypolymerphys IK GmbHDIN EN ISO 75-2:2013-08

Test material: PC (polycarbonate), test specimen type A1 -You will receive a total of 1 sample set with 7 test specimens. A test series consists of 5 individual measurements. The remaining sample material can be used for preliminary tests. Sample preparation: -A parallel section measuring 80 mm (+- 2 mm) must be cut from each of the type A1 test specimens. Conditioning & execution: -If possible, store the specimens for at least 24 hours in a normal climate at (23 ± 2) °C and (50 ± 10) % relative humidity -Procedure A with a bending stress of 1.80 MPa Perform five tests and enter the results in labXplore. The results evaluation will then be available to you immediately. The evaluation is anonymous, and you can view your own results in comparison to other participants.

Test Properties

heat deflection temperature

90.00 EUR

Vicat softening temperature Method B50, ISO 306 (polycarbonate 2025)

Provided bypolymerphys IK GmbHDIN EN ISO 306:2023-03

Test material: PC (polycarbonate), test specimen type A1 -You will receive a total of 1 sample set with 5 test specimens. A test series consists of 5 individual measurements. The remaining sample material can be used for preliminary tests. Sample preparation: -A piece measuring at least 10 mm x 10 mm must be cut from the parallel part of each type A1 test specimen. Conditioning & execution: -If possible, store samples for at least 24 hours in a normal climate at (23 ± 2) °C and (50 ± 10) % RH -Procedure B50 with a force of 50 N and a heating rate of 50°C/h Perform five tests and enter the results in labXplore. The results evaluation will then be available to you immediately. The evaluation is anonymous, and you can view your own results in comparison to other participants.

Test Properties

Vicat softening temperature (VST)

90.00 EUR

Advantages of round robin tests via labXplore

The digital platform for round robin tests - labXplore - represents a significant advance in the management and performance of round robin tests, as it eliminates many of the inefficiencies and limitations of conventional methods.

The evaluation of your round robin tests participation is available immediately after entering your test results.
Traditional organization of these tests with manual processes is associated with waiting times, is prone to errors, and causes high administrative burden. labXplore offers an optimized and digital alternative that not only mitigates these problems, but also offers an additional benefit through real-time data processing.
The evaluation of the round robin tests is based on requirements of ISO 13528.
The platform is available anytime worldwide. This allows you to access round robin tests on different test methods and older data sets.
The anonymity of your data is guaranteed. Your laboratory is assigned a laboratory number that only you know.

Real-time result evaluation: Z-score result diagram of the test results of a round robin test to ISO 527

Contact for round robin tests via labXplore Sascha Meudt

Would you like to learn more about the digital platform for round robin tests?

Please feel free to setup your demo free of charge via our labXplore partner website or discuss your questions with a labXplore expert.

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Who is required to participate in round robin tests?

The following groups are required to participate in round robin tests:

Accredited laboratories: ISO 17025 is the globally valid standard for laboratory accreditation in the field of testing and calibration. It lays down general requirements for the competence, impartiality and uniform working methods of laboratories. It was developed with the aim of promoting confidence in the work of laboratories. Laboratories accredited according to ISO 17025 are therefore required to regularly participate in proficiency tests / round robin tests.
Organizations in quality assurance: Companies that must demonstrate that their internal processes and results comply with the prescribed standards, e.g. for ISO certifications, are required to perform regular round robin tests.
Industry-specific laboratories: In certain industries, such as the chemical, materials testing or pharmaceutical industries, legal requirements or industry-specific regulations require participation in round robin tests to ensure that results are comparable within the industry.
Recertifications: Companies or laboratories seeking certification or accreditation for the first time are also required to participate to validate compliance with the standards.

Important definitions in the world of round robin tests or proficiency tests:

Proficiency tests (PT)

Proficiency tests are round robin tests that are required for accreditation or to prove the competence of a laboratory. Laboratories must participate in order to validate their methods and ensure compliance with established standards.

Interlaboratory comparison test (ILC) between laboratories:

Interlaboratory comparison tests (ILC) compare the results of several laboratories, either within the same organization or between different organizations, to identify deviations and ensure standardization.

Internal ILC, Control charts (SPC)/Daily Check (DC)

Internal ILC (internal laboratory comparisons): These are comparisons performed within an organization between several laboratories in order to standardize the processes and ensure internal consistency.
Control charts / SPC charts (statistical process control): Instruments derived from round robin test data that are used to monitor and improve process stability and measurement accuracy over time.