Overview
EN ISO 15181-1:2007 - Paints and varnishes: Determination of release rate of biocides from antifouling paints - Part 1: General method for extraction of biocides. This CEN-endorsed ISO standard specifies a repeatable laboratory method to extract biocides from antifouling paint films into artificial seawater under defined conditions. It is intended to be used together with the other parts of ISO 15181 to quantify specific biocides (for example copper or certain organic biocides) in the extract and to calculate laboratory release rates.
Key Topics and Requirements
- Scope and purpose: Defines a general extraction procedure for measuring biocide release from test paint films under specified laboratory conditions.
- Test specimens and sampling: Preparation of painted test cylinders (dimensions and paint-free zones specified) and required supplementary information for reproducibility.
- Apparatus and materials:
- Test cylinder: inert material, diameter ~64 mm ±5 mm, length ~178 mm ±15 mm.
- Release-rate measuring container: inert material, nominal capacity ~2 litres (1.8–2.2 L), diameter 120–150 mm, height 170–210 mm, with three internal baffles.
- Rotating device: rotates cylinder so the surface travels (0.2 ± 0.02) m/s (≈60 ± 5 r/min); device must not contact artificial seawater.
- Temperature control: maintain (25 ± 1) °C for extraction tests.
- Procedure principle: Cylinders are immersed in flowing artificial seawater in a holding tank; at defined intervals they are exposed in individual containers and rotated; biocide concentration in the extract is measured and used to calculate release rate.
- Limitations: Laboratory release rates are generally higher than in-service release rates (published data indicate a significant overestimate - often by an order of magnitude). Results are not directly suitable for environmental risk assessments without applying appropriate correction factors.
Applications and Users
- Practical uses:
- Quality control and comparative performance testing of antifouling paints.
- Material selection and R&D when evaluating biocide-release properties.
- Generating reproducible laboratory release-rate data for product specification.
- Typical users:
- Paint manufacturers and formulation chemists
- Marine coatings testing laboratories
- Product certification and quality assurance teams
- Research organizations studying antifouling performance
Note: Regulatory or environmental impact assessments should consider the method’s laboratory-to-field differences and apply correction factors or complementary in situ data.
Related Standards
- ISO 15181 series:
- Part 2 - Determination of copper-ion concentration and release-rate calculation
- Part 3 - Zineb release-rate calculation (ethylenethiourea determination)
- Part 4 - PTPB concentration and release-rate calculation
- Part 5 - Tolylfluanid / dichlofluanid release-rate calculation (DMST / DMSA)
- Normative references: ISO 1513, ISO 2808, ISO 3696, ISO 15528, ASTM D1141 (substitute ocean water)
Keywords: EN ISO 15181-1:2007, biocide release rate, antifouling paints, extraction method, artificial seawater, paint testing, test cylinders, release rate measuring container.