Overview
EN ISO 2812-1:2017 / ISO 2812-1:2017 - "Paints and varnishes - Determination of resistance to liquids - Part 1: Immersion in liquids other than water" specifies general laboratory methods for assessing how single- or multi-layer coating systems resist exposure to liquids (other than water) and paste‑like products. The standard defines immersion test principles to determine coating degradation and, where needed, damage to the substrate.
Key topics and requirements
- Test principle: coated test pieces are immersed in agreed test liquids and effects are assessed against defined criteria.
- Test pieces: use standard panels (≈150 × 100 mm, 0.7–1.0 mm thick) or steel rods (typical: 150 mm length, 15 mm diameter) to reduce edge effects.
- Preparation & sampling: sample and prepare coatings per ISO 15528 and ISO 1513; apply coatings and allow drying/aging under specified conditions.
- Coating thickness: measure dry film thickness using non‑destructive methods referenced in ISO 2808.
- Conditioning: condition test pieces for at least 16 hours at (23 ± 2) °C and (50 ± 5)% RH (ISO 3270).
- Apparatus: inert vessels for immersion; heating cabinet with ventilation for tests up to 40 °C ± 3 °C.
- Test liquids: choice of one or more liquids agreed between parties; examples listed in Annex A (CAS numbers included in the 2017 edition).
- Test methods: Method A for single‑phase liquids and Method B for two‑phase liquids; procedures include special guidance for high‑conductivity liquids to avoid electrolytic effects.
- Evaluation & reporting: assessment according to agreed criteria, precision statements and mandatory test report content are specified.
Practical applications
- Quality control and durability testing of industrial, automotive, architectural and protective coatings.
- R&D for new paint formulations to screen chemical resistance to solvents, fuels, oils, acids, alkalis and paste‑like chemicals.
- Specification and acceptance testing between suppliers and customers to validate performance under immersion exposure.
- Used by: paint and varnish manufacturers, independent testing laboratories, specification writers, certification bodies, corrosion engineers and maintenance planners.
Related standards
Normative references incorporated by the standard include (but are not limited to): ISO 1513, ISO 1514, ISO 2808, ISO 3270, ISO 3696, ISO 4618, ISO 4628-1/-2, ISO 15528. EN ISO 2812-1:2017 is part of the wider ISO 2812 series covering resistance to liquids.
Keywords: EN ISO 2812-1:2017, ISO 2812-1, paints and varnishes, resistance to liquids, immersion test, coating durability, test panels, coating thickness, conditioning, test liquids.