PROCERTUS and KIWA are pleased to invite you to participate in the 2025–2027 edition of the Interlaboratory Comparison on fly ash. This renowned testing campaign has been organized for over 10 years and has become a key reference in the field of testing fly ash for concrete.

By participating in this campaign, you will:

• Evaluate and monitor your laboratory’s performance throughout the campaign by performing regular tests on the same sample;
• Benchmark your results against those of a large number of specialized laboratories, using the periodic comparison reports published by PROCERTUS;
• Identify deviations or areas for improvement in your testing processes.

Your participation offers a valuable tool for quality management in your laboratory. We strongly encourage you to make the most of the insights this campaign can provide.

This campaign is open to all laboratories performing standardized fly ash testing, including:

• Independent testing laboratories
• Laboratories of fly ash producers
• Laboratories of cement producers
• Laboratories from research or academic institutions

• Gain objective insight into your lab’s performance
• Strengthen your quality assurance processes
• Demonstrate competence to clients and accreditation bodies (e.g. ISO/IEC 17025)
• Be part of a recognized international benchmarking effort

• Focus of this campaign: Fly ash
• Start date: November 2025
• End date: October 2027
• Sample shipping: Test samples (5 kg fly ash in plastic recipients and 25 kg reference cement bags) will be dispatched before the campaign starts.
• Languages: All communication and reports will be in English
• Confidentiality: All results are handled with the utmost confidentiality. In the reports, laboratories will be represented anonymously.
• Standards used: This Interlaboratory Comparison covers cement and fly ash testing according to European standards (such as EN 196 series, EN 451-1, EN 451-2) or – where applicable – equivalent validated methods. A detailed protocol will be provided after registration.

Should you require any additional information regarding the Interlaboratory Comparison – fly ash 2025–2027, please do not hesitate to contact us at: interlab.fly-ash@procertus.be