Overview
EN ISO 7012-2:2025 - Paints and varnishes: Determination of preservatives in water-dilutable coating materials - Part 2 - specifies the apparatus and analytical methods for measuring in-can total formaldehyde in water-dilutable coating materials and polymer dispersions, where in-can preservatives are the main formaldehyde source. The standard is published by CEN/ISO and forms part of the ISO 7012 series for preservative analysis in coatings.
Key topics and requirements
- Scope and applicability: Covers water-dilutable coatings and polymer dispersions; targets total formaldehyde (free + bound) present in the container (in-can).
- Analytical principles: Describes acidic water–steam distillation and derivatization approaches (including derivatization with chromotropic acid (CHRA)) as core measurement principles.
- Methods for free/formaldehyde fractions: Defines methods for in-can free formaldehyde (e.g., photometric acetylacetone procedure, DNPH liquid chromatography, post-column acetylacetone LC) and the procedures to determine total formaldehyde after distillation/derivatization.
- Apparatus and reagents: Specifies laboratory equipment, reagent quality (reference to analytical-grade water), and reagents for CHRA derivatization and titration calibration.
- Procedure elements: Includes sampling, distillation, derivatization, calibration, analysis, and calculation of in-can total formaldehyde content.
- Quality and performance: Provides precision metrics (repeatability limit r and reproducibility limit R), requirements for calibration and titration (Annex A), and reports interlaboratory test results (Annex B).
- Reporting: Lists required information for a complete test report, ensuring traceability and comparability of results.
Applications and users
Who uses EN ISO 7012-2:2025:
- Paint, varnish and polymer dispersion manufacturers - routine quality control of preservative-related formaldehyde content.
- Analytical and contract testing laboratories - accredited testing and method implementation.
- R&D and formulation teams - assessing preservative behaviour, bound vs free formaldehyde, and shelf-life implications.
- Regulatory and compliance professionals - supporting product safety assessments and regulatory submissions.
- Preservative suppliers - verifying in-can release profiles and compatibility.
Practical uses:
- Product release testing and batch verification.
- Shelf-life and stability studies linked to preservative efficacy.
- Risk assessment and documentation for safety data sheets and regulatory compliance.
Related standards
- ISO 7012 series (other parts covering preservatives and related analyses)
- ISO 1513 - Examination and preparation of test samples
- ISO 3696 - Water for analytical laboratory use
- ISO 15528 - Sampling of paints, varnishes and raw materials
For laboratories and manufacturers working with water-dilutable coatings and polymer dispersions, EN ISO 7012-2:2025 is the reference for robust, standardized measurement of in-can total formaldehyde and supports reliable quality control and regulatory compliance.
