A Preface
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The procedures used to develop this document as well as those used for further maintenance are described in Part 1 of the ISO/IEC Directive. In particular, attention should be paid to the different approval criteria required for different types of ISO documents. This document has been drafted in accordance with the editorial rules of Part 2 of the ISO/IEC Directive (see iso.org/directives).

ISO 15528-2020 “Sampling of paints, varnishes and corresponding raw materials”

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This document has been prepared by Technical Committee ISO/TC 35 (Paints and varnishes), Subcommittee SC 9 (General test methods for paints and varnishes), in cooperation with the European Committee for Standardization (CEN) Technical Committee CEN/TC 139 (Paints and varnishes), in accordance with the ISO/ CEN Technical Cooperation Agreement (Vienna Agreement).

The third edition eliminates and replaces the technically revised second edition (ISO 15528:2013) and ISO 8130-9:1992. Compared with the previous edition, the main changes are as follows:

ISO 15528-2020 “Sampling of paints, varnishes and corresponding raw materials”

– ISO 8130-9 powder coating sampling is included in the scope;

— All information in ISO 8130-9 regarding the division of paint powder samples has been deleted;

— The text has been edited and revised, and normative references have been updated.

Any feedback or questions regarding this document should be directed to the user’s national standards body. A full list of these agencies can be found at iso.org/members.html.

Introduction
Sampling depends on the size of the product and container, but not on the type of product, such as paints, varnishes, paint powders, adhesives, pigments, fillers or solvents. ISO 1513 specifies procedures for the preliminary examination of individual samples received and for the preparation of test samples by mixing and reducing a series of samples representing a batch of paints, varnish or related products. Samples of the product to be tested have been collected in accordance with this document.

Correct sampling is the basis for subsequent tests and their results. Operators with the required knowledge and experience need to perform the various sampling procedures with great care. The general instructions in this document are intended to complement this knowledge and experience and apply to most situations. However, some products may require special sampling precautions not provided in this document; Therefore, operators need to be particularly vigilant to pay attention to any abnormal characteristics exhibited by these products. Operators should be aware of product specifications and national safety regulations that may require special precautions.

ISO 15528-2020 “Sampling of paints, varnishes and corresponding raw materials”

1 Scope
The document specifies procedures for sampling paints and varnishes, including paint powders, and raw materials used in their manufacture. Such products include liquids and materials that are not chemically modified and can liquify when heated, as well as powders, granules and pastes. Samples may be taken from containers, such as cans, barrels, tanks, tank cars or ship tanks, or from barrels, sacks, large bags, silos or silo cars or conveyors.

This document does not address sample preparation for testing or reducing samples thus collected, which is covered in ISO 1513.

2 Normative references
The following documents are referenced in the text in such a way that some or all of their contents constitute the requirements of this document. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies.

ISO 4618, Paints and varnishes — Terms and definitions

ISO 6206, Chemical products for industrial use — Sampling — Vocabulary

ISO 15528-2020 “Sampling of paints, varnishes and corresponding raw materials”

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 and ISO 6206 and the following provisions apply.

3.1 Batch

A given quantity of material produced under uniform conditions

3.2 A Lot

Total amount of material to be sampled

Note 1: Batches may consist of multiple batches (3.1).

3.3 Individual Samples

A portion of a product removed from bulk material by a single sampling operation

3.4 Representative Samples

A sample conforming to all the characteristics of the sampled material within the accuracy of the test method used

3.5 Average sample

Mixtures of equivalent parts of a single sample (3.3)

3.6 Top Example

Individual samples collected on or near the surface of the material (3.3)

3.7 Middle sample

A single sample (3.3) was collected at a level equivalent to approximately half of the total volume below the surface

3.8 Bottom sample

A single sample taken at or near the lowest level of the material (3.3)

ISO 15528-2020 “Sampling of paints, varnishes and corresponding raw materials”

3.9 Full-layer samples

Individual samples (3.3) were collected through the total height of the material in order to collect all layers proportionally

3.10 Composite samples

A single sample taken from multiple different grades of material (3.3)

3.11 Intermittent samples

Individual samples collected intermittently from material streams (3.3)

3.12 Continuous sampling

Samples were collected continuously from the material stream

3.13 Storage example

Single samples (3.3), average samples (3.5), or continuous samples (3.12), were collected and stored for reference during a specified period of time

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