ISO 21475:2019 PDF

Name: ISO 21475:2019 — Plastics — Methods of exposure to determine the wavelength dependent degradation using spectrally dispersed radiation
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Plastics — Methods of exposure to determine the wavelength dependent degradation using spectrally dispersed radiation

Название (английский):

ISO 21475:2019

Plastics — Methods of exposure to determine the wavelength dependent degradation using spectrally dispersed radiation

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 18
Дата публикации:: 23 мая 2019 г.
Издание:: ISO IS 21475 edition 1 version 1
ICS:: 83.080.01

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Описание (английский):

This document specifies methods of determining the spectral response of all kind of plastics materials to ultraviolet and visible radiation by an irradiation test with spectrally dispersed irradiation. NOTE Typical specimens that are evaluated include: films, liquids, plaques, pellets, powders, sheets and discs.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 21475:2019 specifies laboratory methods to determine the wavelength-dependent degradation of plastics using spectrally dispersed ultraviolet (UV) and visible radiation. The standard defines how to expose specimens (films, liquids, plaques, pellets, powders, sheets, discs) to a spectrally dispersed beam, measure the resulting changes in optical or mechanical properties, and derive the material’s action spectrum (spectral sensitivity) across roughly 200–700 nm.

Keywords: ISO 21475:2019, plastics testing, spectrally dispersed radiation, wavelength dependent degradation, spectral response, UV-visible.

Key topics

Principle: Expose a specimen to spatially separated wavelengths so that position on the specimen corresponds to wavelength; quantify degradation as a function of wavelength.

Exposure device: Use a broadband source (typically a Xenon arc lamp), entrance slit, diffraction grating (blazed where appropriate), and optics to form a dispersed image at the specimen plane. Remove ozone if generated.

Spectral characterization: Measure spectral irradiance Eλ (W·m−2·nm−1) and spectral radiant exposure (J·m−2·nm−1) across specimen positions. Report peak wavelengths λ(x) and irradiance integrals E(x).

Resolution parameters: Entrance-slit width controls spectral resolution vs irradiance; reciprocal linear dispersion (nm/mm) and spatial resolution (slit image width) are key characterization metrics.

Instrumentation: Use a calibrated spectroradiometer with a diffusing detector sized to the system spatial resolution. Use appropriate measuring devices for property change with lateral resolution matched to exposure resolution.

Specimen preparation & conditioning: Prepare and condition specimens per agreement and typically in line with ISO 291; report methods used. Color and optical measurements should be done immediately after exposure or after agreed conditioning.

Temperature control: Typically ambient; specimen heating by dispersed radiation is negligible but temperature control may be applied and must be reported.

Reporting: Include apparatus parameters, spectral irradiance maps, specimen conditioning, exposure duration, and measured property changes.

Applications

Determining spectral sensitivity of polymer degradation and discoloration

Comparative material screening for UV/visible stability

R&D for UV stabilizers, additives, and coatings

Quality assurance and accelerated degradation studies for outdoor/indoor exposure simulations Who uses it: materials scientists, polymer formulators, testing laboratories, product designers, failure analysts, and regulatory bodies concerned with polymer weathering.

Related standards

ISO 291 - Standard atmospheres for conditioning and testing

ISO 472 - Plastics - Vocabulary

ISO 4582 - Determination of changes in colour after exposure to solar or laboratory radiation

This standard helps organizations generate quantitative, wavelength-resolved degradation data for plastics, enabling targeted formulation improvements and more predictive lifetime assessments.

ISO 21475:2019 PDF

Abstract

Похожие стандарты

Overview

Key topics

Applications

Related standards

Технические детали

BS ISO 2910:2018

Cinematography. Screen luminance and chrominance for the projection of film motion pictures.

ISO 472:2013/Amd 1:2018

Plastics — Vocabulary — Amendment 1: Additional items

SIST ISO 458-2:1996

Plastics -- Determination of stiffness in torsion of flexible materials -- Part 2: Application to plasticized…