Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO document should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

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This document was prepared by Technical Committee ISO/TC 256, Pigments, dyestuffs and extenders, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC 298, Pigments and extenders, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This second edition cancels and replaces the first edition (ISO 787-5:1980), which has been technically revised.

The main changes are as follows:

the normative references have been updated;
in Clause 5, a dropping bottle with a pipette has been added and the accuracy of the balance has been specified;
in Clause 7, the procedure of conditioning and its parameters have been added as 7.2, and the temperature and humidity has been specified during the test;
in 7.3, Table 1, the table header and expected oil absorption values, expressed in grams of oil per 100 g of product, have been added;
in 7.4, an additional method using the dropping bottle for adding the oil has been added as 7.4.2;
in Clause 8, the expression of results by using the additional dropping bottle method (as 8.2) and two calculation formulas have been added;
a bibliography has been added.

A list of all parts in the ISO 787 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

1 Scope

This document specifies a general method of test for determining the oil absorption value of a sample of pigment or extender. The oil absorption value is usually required to be compared with the value determined at the same time on an agreed sample of the product.

2 Normative references

3 Terms and definitions

4 Reagent

5 Apparatus

5.1

5.2

5.3

5.4

5.5

6 Sampling

7 Procedure

7.1 General

7.2 Conditioning

7.3 Test portion

7.4 Determination

8 Expression of results

8.1 Burette method

8.2 Dropping bottle method

9 Test report

Bibliography