Overview
ISO 7012-1:2025 - Paints and varnishes - Determination of preservatives in water-dilutable coating materials - Part 1: Determination of in‑can free formaldehyde specifies validated laboratory methods to measure in‑can free formaldehyde in water‑dilutable coatings and polymer dispersions. The standard defines the required apparatus, reagents, extraction and derivatization procedures, calibration and quantification approaches, and reporting requirements for reliable determination of free formaldehyde present in coating products.
Key topics and technical requirements
- Scope and applicability: Applies to water‑dilutable coating materials and polymer dispersions; Method A has limited suitability for heavily pigmented systems because sample coloration can affect photometric detection.
- Three analytical principles:
- Method A - derivatization with acetylacetone (ACAC) followed by photometric detection.
- Method B - derivatization with dinitrophenylhydrazine (DNPH) followed by liquid chromatography (LC/HPLC or UHPLC) separation and UV/VIS detection.
- Method C - LC separation with post‑column derivatization using ACAC and subsequent UV/VIS quantification.
- Apparatus and reagents: Standard lists for general laboratory equipment, extraction setup, HPLC/UHPLC systems and columns, and specified reagents (formaldehyde standards, calibration solutions, Carrez reagents optional).
- Procedure elements: Sampling, extraction, derivatization, calibration, blank checks, sample measurement and calculation of in‑can free formaldehyde content.
- Quality and performance: Includes precision information (repeatability limit r and reproducibility limit R), quality checks, and requirements for test reports.
- Supporting material: Normative annex on titration methods for formaldehyde standards and informative annexes with example HPLC conditions and interlaboratory test results.
Practical applications and users
ISO 7012-1:2025 is intended for:
- Paint and varnish manufacturers performing incoming/outgoing quality control and preservative monitoring.
- Analytical laboratories conducting preservative and safety testing on water‑borne coatings and polymer dispersions.
- Regulatory and compliance teams assessing product safety related to free formaldehyde content.
- R&D groups optimizing formulations to control preservative release and formaldehyde presence.
Using the standard helps organizations ensure consistent, comparable test results, support product safety declarations, and meet internal or external testing requirements.
Related standards (normative references)
- ISO 1513 - Examination and preparation of test samples
- ISO 3696 - Water for analytical laboratory use
- ISO 15528 - Sampling of paints, varnishes and raw materials
Keywords: ISO 7012-1, in‑can free formaldehyde, paints and varnishes, water-dilutable coating materials, preservative determination, ACAC, DNPH, HPLC, photometric detection, LC-UV/VIS, quality control.