ISO/TR 18486:2018

Name: ISO/TR 18486:2018 — Plastics — Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance
SKU: ISO/TR 18486:2018
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Plastics — Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance

Название (английский):

ISO/TR 18486:2018

Plastics — Parameters comparing the spectral irradiance of a laboratory light source for weathering applications to a reference solar spectral irradiance

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 26 ноября 2018 г.
Издание:: ISO TR 18486 edition 2 version 1
ICS:: 83.080.01

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Описание (английский):

This document specifies a calculation method which allows calculating a parameter which compares the spectral irradiance of a laboratory radiation source for weathering application to a reference solar spectral irradiance.

Abstract

Похожие стандарты

Упомянутые в описании и другие стандарты ISO

Overview

ISO/TR 18486:2018 provides a calculation method to compare the spectral irradiance of a laboratory light source used for weathering tests with a reference solar spectral irradiance. It defines objective, reproducible parameters to quantify how well a solar simulator or other laboratory radiation source matches a reference “sun” over a chosen wavelength range, including the option to weight the comparison by a known action spectrum for a specific photochemical response.

Key Topics and Requirements

Characterizing parameter f: A numerical metric that expresses the deviation between the laboratory source and the reference solar spectral irradiance. An ideal fit gives f = 0; larger values indicate worse fitting.

Scaling conditions: Two scaling procedures are specified:

Unweighted scaling by matching integrated spectral irradiance over a selected wavelength interval.
Weighted scaling using an action spectrum s(λ) to emphasize wavelengths important for a particular polymer response.

Wavelength selection: Choose a wavelength range λ1–λ2 (must be > 10 nm) relevant to the application (e.g., UV-A, UV+VIS).

Spectral resolution: Calculations require spectral data at 1 nm resolution.

Practical computation: Formulas are provided to compute f for both plain and action spectrum–weighted cases; Annex A gives real-world examples for commercially available solar simulators.

Significance considerations: The standard highlights that full-spectrum simulation is unnecessary in many cases - focusing on the material-sensitive bands (UV, VIS, IR) can be more economical and technically appropriate.

Applications and Who Uses It

Materials and plastics manufacturers: To select and validate laboratory light sources for accelerated weathering tests and to ensure reproducible degradation testing.

Test laboratories and QA teams: For objective comparison of solar simulators (filtered xenon, fluorescent UV 340, carbon-arc, etc.) and to document conformity to reference spectra.

R&D and material scientists: To weight spectral comparisons by action spectra of specific photochemical processes, improving relevance of accelerated testing.

Equipment manufacturers: To design and filter solar simulators to achieve better spectral matching and to provide standardized performance metrics.

Standards bodies and regulators: As a supporting technical report to quantify spectral matching in related test standards.

Related Standards

ISO 4892 series (exposure to laboratory light sources)

ISO/TR 17801 (reference global solar spectral irradiance calculated with SMARTS2)

ASTM G177 (SMARTS2-based reference sun)

Historical reference: CIE 85 (recalculated versions are discussed)

ISO/TR 18486:2018 helps stakeholders move from qualitative claims about spectral matching to quantitative, reproducible evaluation - improving the reliability and comparability of laboratory weathering tests.

ISO/TR 18486:2018

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications and Who Uses It

Related Standards

Технические детали

BS EN ISO 489:2022

Plastics. Determination of refractive index (ISO 489:2022)

PD CEN ISO/TR 17801:2017

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