Overview
ISO 1513:2010 (Fourth edition, 2010) defines standardized procedures for the preliminary examination and preparation of test samples of paints, varnishes and related products. The standard ensures that laboratory testing is carried out on samples that are representative of the consignment or bulk material, and that sample handling is recorded and reported consistently.
Key aspects covered include procedures for single-sample examination, blending and reduction of a series of samples, and preparation methods for liquid, paste-like and powder products. The standard complements sampling requirements in ISO 15528 and uses terminology aligned with ISO 4618.
Why it matters: Following ISO 1513:2010 reduces variability introduced by poor sample handling, improves traceability, and supports reliable, comparable test results across laboratories.
Key Topics
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Preliminary examination: Inspect containers for defects or leakage and note any bulging or evidence of gas/vapour pressure. Record visible features such as surface skin, consistency (thixotropy vs gelling), separation into layers, visible impurities, clarity, colour and sediment type.
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Homogenization:
- Reject samples with irreversible gelling or hard-dry sediment that cannot be reincorporated.
- Remove skin and strain remnants if required.
- For non-compact sediment, mix thoroughly until homogenous while avoiding entrainment of air.
- For compact sediment, pour off liquid, remix settled material, then reintroduce the liquid incrementally to achieve uniform consistency. Ensure the sample is free from air bubbles before testing.
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Blending and reduction of series samples:
- After mixing each sample, combine into a clean, dry container and homogenize.
- Take a reduced sample in accordance with ISO 15528. When transferring to final containers, allow 5% ullage, then close, label and, if necessary, seal.
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Powder products: Note unusual features (large lumps, foreign matter). Mix thoroughly and reduce by quartering or using a riffle divider where appropriate.
Applications
- Quality control laboratories assessing paint and varnish batches
- Incoming inspection for manufacturers, distributors and contractors
- Inter-laboratory comparisons and conformity testing
- Preparatory steps before physical, chemical or performance tests
Related Standards
- ISO 4618 - Paints and varnishes: Terms and definitions (used for consistent terminology)
- ISO 15528 - Paints, varnishes and raw materials: Sampling (used for sampling and reduction procedures)
Following ISO 1513:2010 helps ensure sample integrity and reproducibility of test results by standardizing examination, homogenization, blending, reduction and labelling practices for paints and varnishes.
