ISO 787-17:2019

Name: ISO 787-17:2019 — General methods of test for pigments and extenders — Part 17: Comparison of lightening power of white pigments
SKU: ISO 787-17:2019
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General methods of test for pigments and extenders — Part 17: Comparison of lightening power of white pigments

Название (английский):

ISO 787-17:2019

General methods of test for pigments and extenders — Part 17: Comparison of lightening power of white pigments

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 2 апреля 2019 г.
Издание:: ISO IS 787 edition 3 version 1
ICS:: 87.060.10

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Описание (английский):

This document specifies a general method of test for comparing the lightening (reducing) power of a white pigment with the lightening power of an agreed sample of the same type. Two procedures (A and B) are specified. Procedure A is quicker than procedure B and is suitable for testing one sample of pigment; procedure B is better for testing several samples, and especially if a pigment of unknown lightening power is being tested.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 787-17:2019 - General methods of test for pigments and extenders - Part 17 - specifies a comparative laboratory method to determine the lightening (reducing) power of white pigments against an agreed reference sample of the same type. The standard defines two procedures:

Procedure A: quicker, suited to testing a single sample;

Procedure B: more exhaustive, suited to multiple samples or pigments of unknown lightening power.

The method uses a prepared blue paste into which measured amounts of the test and reference white pigments (e.g., titanium dioxide, zinc oxide, lithopone, zinc sulfide) are dispersed, followed by visual comparison of opaque strips on a glass slide under diffuse daylight.

Key topics and requirements

Blue paste composition (example quantities provided): castor oil (500 g), precipitated calcium sulfate CaSO4·2H2O (475 g), ultramarine blue (5 g), treated natural earth (20 g).

Sample preparation: dispersion of measured pigment masses into 5 g of blue paste using an automatic muller (ground-glass plates, up to ~1 000 N force, specified revolutions) or by hand muller/palette knife.

Reference masses (Procedure A examples): zinc oxide/lithopone 0.500 g; high‑grade zinc sulfide 0.200 g; titanium dioxide 0.100 g. Procedure B uses a series of reference masses (see standard) to derive percentage lightening power.

Comparison method: spread pastes in opaque strips on a glass slide and compare intensity in diffuse daylight (or artificial daylight if necessary).

Expression of results: relative lightening power = 100 × (mass of reference pigment / mass of test pigment) (Procedure A) or read/ interpolate percentage from the Procedure B reference series.

Reporting: identify pigment tested, reference to ISO 787-17:2019, test conditions and results.

Applications and users

ISO 787-17:2019 is practical for:

Quality control laboratories in pigment manufacturing and paint/varnish production;

R&D and formulation teams comparing titanium dioxide and alternative white pigments;

Procurement and specification teams requiring standardized comparative data on lightening power;

Conformity assessment and product specification writers who need repeatable, documented test results.

Keywords: ISO 787-17:2019, lightening power, white pigments, titanium dioxide, zinc oxide, lithopone, test method, pigment comparison.

ISO 787-17:2019

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

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