PROCERTUS and KIWA are pleased to invite you to participate in the 2025–2026 edition of the Interlaboratory Comparison on cement. This renowned testing campaign has been organized for over 20 years and has become a key reference in the field of cement testing.

By participating in this campaign, you will:

• Evaluate and monitor your laboratory’s performance throughout the campaign by performing regular (weekly or monthly) 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 cement testing, including:

• Independent testing laboratories
• Laboratories from 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: Cement type CEM I 52.5 N
• Start date: November 2025
• End date: October 2026
• Sample shipping: Test samples (25 kg in plastic 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 testing according to European standards (EN 196 series) or – where applicable – equivalent validated methods. A detailed protocol will be provided after registration.

Should you require any additional information regarding the Interlaboratory Comparison – cement 2025–2026, please do not hesitate to contact us at: interlabo.cement@procertus.be