Overview
EN ISO 19396-2:2025 - Paints and varnishes - Determination of pH value - Part 2: pH sensors with ISFET technology (ISO 19396-2:2025) specifies a standardized method for measuring the pH of dispersions and coating materials using ion‑sensitive field‑effect transistor (ISFET) pH sensors. Endorsed by CEN in June 2025, this second edition updates and supersedes EN ISO 19396-2:2020 and aligns with the ISO 19396 series for pH measurement of paint products.
Key topics and requirements
- Scope: Measurement of pH in aqueous dispersions and coating materials using ISFET‑based pH sensors.
- Apparatus and materials: Requirements for pH measuring apparatus, pH meters, ISFET sensors (including schematic design), and buffer solutions.
- Sampling and sample preparation: References ISO 1513 and ISO 15528 for examination, preparation and sampling of test specimens.
- Procedure essentials:
- Test conditions and number of determinations
- Calibration of pH meters and ISFET sensors (calibration clause clarified in this edition)
- Measuring technique and recording of results
- Evaluation and precision:
- Statistical treatment including repeatability (r) and reproducibility (R) limits
- Annex A provides informative guidance for determination of precision
- Reference electrodes and temperature:
- Use of a stable reference electrode (commonly Ag/AgCl with KCl electrolyte) is described
- An integrated temperature sensor is recommended for compensated measurements
- Terminology updates: The term “ISFET electrode” is replaced by “ISFET sensor”; a few definitions were revised from the 2017 edition.
Practical applications and users
This standard is intended for professionals involved in quality control, R&D and compliance testing of paints, varnishes and coating raw materials, including:
- Paint and coatings manufacturers (QC laboratories)
- Formulation chemists and product development teams
- Raw material suppliers and testing service laboratories
- Sensor and instrumentation manufacturers supplying ISFET pH systems
- Regulatory and conformity assessment bodies monitoring product consistency
Use EN ISO 19396-2:2025 to ensure consistent, reproducible pH measurement of dispersions and coatings when employing ISFET technology as an alternative to glass‑membrane pH sensors.
Related standards
Keywords: EN ISO 19396-2:2025, ISFET pH sensor, paints and varnishes pH determination, pH measurement dispersions, coating materials pH, paint quality control.
