ISO 787-15:2019 PDF

General methods of test for pigments and extenders — Part 15: Comparison of resistance to light of coloured pigments of similar types

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Title (English):

ISO 787-15:2019

General methods of test for pigments and extenders — Part 15: Comparison of resistance to light of coloured pigments of similar types

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 7
Publication date:: July 30, 2019
Edition:: ISO IS 787 edition 2 version 1
ICS:: 87.060.10

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Description (English):

This document describes a general method of test for comparing the resistance to light of samples of similar types of coloured pigments (agreed reference pigment and test sample). Two methods of exposure are described in this document. In method A, the material is exposed under glass to natural light. In method B, the material is exposed to direct artificial light.

Technical details

Technical committee: ISO/TC 256 - Pigments, dyestuffs and extenders
SKU: ISO 787-15:2019

Abstract

Overview

ISO 787-15:2019 - General methods of test for pigments and extenders - Part 15 - specifies a comparative method to assess the resistance to light (light fastness) of coloured pigments of similar types. The standard defines how to prepare side-by-side test specimens using an agreed reference pigment and a test sample, and describes two exposure methods: Method A (natural light under glass) and Method B (direct artificial light, e.g. xenon arc). Results are evaluated by comparing colour change between the sample and the reference.

Key topics and technical requirements

Test principle: Disperse test pigment and agreed reference pigment in the same binder, apply as adjacent films on a common substrate, expose both under identical conditions, and compare colour change.
Specimen preparation: Apply wet films of 50–100 µm (or mass-tone prints ≈1.5 µm), dry 24 h in diffuse daylight; retain a dark control specimen.
Substrates: White, non‑absorbent high‑gloss coated aluminium, rigid cardboard, or paper for mass‑tone prints.
Method A (natural exposure under glass):
- Use an exposure cabinet with a single clear glass cover (2–3 mm) that transmits ≈90% at 360 nm and throughout visible wavelengths.
- Position cabinet to receive direct sunlight; slope toward the equator (approximate latitude angle) or specify if different.
Method B (artificial exposure):
- Use a suitable weathering cabinet (xenon arc or equivalent) with controlled spectral irradiance:
  - Total irradiance (300–800 nm): (550 ± 55) W/m²
  - Irradiance (300–400 nm): (50 ± 15) W/m²
  - Wavelengths

Related standards

Other ISO standards

Overview

Key topics and technical requirements

Test principle: Disperse test pigment and agreed reference pigment in the same binder, apply as adjacent films on a common substrate, expose both under identical conditions, and compare colour change.
Specimen preparation: Apply wet films of 50–100 µm (or mass-tone prints ≈1.5 µm), dry 24 h in diffuse daylight; retain a dark control specimen.
Substrates: White, non‑absorbent high‑gloss coated aluminium, rigid cardboard, or paper for mass‑tone prints.
Method A (natural exposure under glass):
- Use an exposure cabinet with a single clear glass cover (2–3 mm) that transmits ≈90% at 360 nm and throughout visible wavelengths.
- Position cabinet to receive direct sunlight; slope toward the equator (approximate latitude angle) or specify if different.
Method B (artificial exposure):
- Use a suitable weathering cabinet (xenon arc or equivalent) with controlled spectral irradiance:
  - Total irradiance (300–800 nm): (550 ± 55) W/m²
  - Irradiance (300–400 nm): (50 ± 15) W/m²
  - Wavelengths

ISO 787-15:2019 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

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Overview

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