ISO 2812-4:2017 PDF

Name: ISO 2812-4:2017 — Paints and varnishes — Determination of resistance to liquids — Part 4: Spotting methods
SKU: ISO 2812-4:2017
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Paints and varnishes — Determination of resistance to liquids — Part 4: Spotting methods

Название (английский):

ISO 2812-4:2017

Paints and varnishes — Determination of resistance to liquids — Part 4: Spotting methods

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 7
Дата публикации:: 10 ноября 2017 г.
Издание:: ISO IS 2812 edition 2 version 1
ICS:: 87.040

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Описание (английский):

ISO 2812-4:2017 specifies spotting methods for determining the resistance of an individual-layer or multi-layer system of coating materials to the effects of liquids or paste-like products. These methods enable the testers to determine the effects of the test substance on the coating and, if necessary, to assess the damage to the substrate.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 2812-4:2017 - Paints and varnishes: Determination of resistance to liquids - Part 4: Spotting methods - specifies laboratory procedures to evaluate how individual-layer or multi-layer coating systems resist exposure to liquids and paste‑like substances. The standard defines spotting test procedures that reveal coating damage and, where needed, allow assessment of substrate attack. Typical test substances include fuels, automotive fluids, laboratory chemicals (with CAS numbers listed), and biological deposits (e.g., simulated bird droppings).

Key topics and requirements

Test principle: Apply a defined quantity of test substance to a coated test panel (spotting) and assess effects against agreed criteria.

Apparatus: Common lab equipment including a pipette (~0.1 ml droplets), 50 ml burette, and 60 mm Petri dishes.

Test panels: Use standard panels (≈150 × 100 mm, 0.7–1.0 mm thick) prepared per ISO 1514 and coated with the product/system under test. Measure dry film thickness using ISO 2808 methods.

Conditioning and conditions: Condition panels for at least 16 h at (23 ± 2) °C and (50 ± 5) % RH (ISO 3270); perform tests at (23 ± 2) °C.

Spotting methods:

Method A (horizontal): Apply droplets or ~0.5 cm of viscous/paste-like substances, cover with Petri dishes; perform duplicate tests. Maintain at least 12 mm clearance from panel edges.
Method B (inclined): Place panel at 30° and apply liquid drops from a burette at 1–2 s intervals over 10 min so the liquid flows into a collecting vessel.

Evaluation: After test duration, remove residues (wipe with dry cotton wool; rinse aqueous residues; use a non‑attacking solvent for others). Assess blistering per ISO 4628-2 and visible alterations per ISO 4628-1; reassess after 24 h. Additional tests (cross‑cut, hardness) or substrate examination may be performed.

Reporting: Include identification of coating, panel details, method used, test substances and duration, temperature, results, operator name, deviations, anomalies and test date. Note: precision data (repeatability r, reproducibility R) are not specified.

Applications and who uses it

Quality control and production testing by paint and varnish manufacturers.

Automotive and transport coating validation (resistance to fuels, oils, washer fluid, bird droppings).

Independent test laboratories and R&D teams assessing new formulations or multi-layer systems.

Specification writers and procurement to define liquid resistance requirements in technical contracts.

Keywords: ISO 2812-4, spotting methods, paint testing, coating resistance to liquids, liquid resistance test, paints and varnishes standard.

ISO 2812-4:2017 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and who uses it

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