ISO 10820:2025 PDF

Fine ceramics (advanced ceramics, advanced technical ceramics) — Ultraviolet irradiation equipment using UV-A LEDs and optical radiometry for performance test of semiconducting photocatalytic materials

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Title (English):

ISO 10820:2025

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 11
Publication date:: September 18, 2025
Edition:: ISO IS 10820 edition 1 version 1
ICS:: 81.060.30

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Description (English):

This document specifies the irradiation equipment using ultraviolet light emitting diode (UV-LED) and optical radiometry for testing the performance of semiconducting photocatalytic materials. The UV-LED irradiation equipment specified in this document uses UV-LEDs having a peak wavelength of 365 nm in the UV-A range and applies for a semiconductor photocatalyst exhibiting a photocatalytic function at this wavelength. This document applies only to irradiation equipment using UV-LED. ISO 10677[ REF Reference_ref_2 \r \h 2 08D0C9EA79F9BACE118C8200AA004BA90B0200000008000000100000005200650066006500720065006E00630065005F007200650066005F0032000000 ] is applicable for equipment using conventional UV light sources such as fluorescent lamps.

Technical details

Technical committee: ISO/TC 206 - Fine ceramics
SKU: ISO 10820:2025

Abstract

Overview

ISO 10820:2025 specifies ultraviolet (UV) irradiation equipment and optical radiometry for performance testing of semiconducting photocatalytic materials, with a focus on UV-A LEDs. The standard defines spectral, electrical and measurement requirements for UV‑LED sources (peak wavelength 365 nm ± 5 nm) and for the radiometric instruments used to quantify irradiance and dose. ISO 10820 is intended for testing photocatalysts that are excited at 365 nm and complements existing standards for conventional lamps (see Related Standards).

Key topics and requirements

UV‑LED spectral characteristics
- Peak wavelength: 365 nm ± 5 nm
- Full width at half maximum (FWHM): ≤ 10 nm
- Cut-on wavelength: 345 nm ± 5 nm (recommended)
- Cut-off wavelength: 385 nm ± 5 nm (recommended)
LED drive and stability
- UV‑LED chips shall be driven by direct current (DC) only.
- UV irradiance stability requirement: ≤ 1.25 %/h (measured at start, end and each 1‑h interval during tests).
- Replacement: replace UV‑LED chips when irradiance falls to 70% of initial value.
Irradiation uniformity
- Uniformity U = |Eav − Emin| / Eav × 100 (%), where Eav is average and Emin is minimum irradiance on the sample surface.
- For multi‑chip arrays, use identical chips (same manufacturer/catalogue) and consider wavelength selection to ensure uniform spectral output.
Optical radiometry requirements
- UV radiometers: spectral responsivity should be constant over 310–400 nm or calibrated against a matching spectral source; measurements traceable to national metrology.
- Spectroradiometers: bandwidth ≤ 5 nm, calculation interval = bandwidth, and UV irradiance calculated by E = ∫315–400 E(λ) dλ. Calibration traceable to national spectral irradiance standards.
- Directional response (cosine) index f ≤ 8% (can be waived for parallel optics or single‑chip sources).
Reporting
- Test reports must include reference to ISO 10820:2025, equipment type/manufacturer/catalogue, radiometer/spectroradiometer details, and measured UV irradiance at the sample.

Applications and users

ISO 10820 is intended for laboratories, test houses, manufacturers of photocatalytic materials (including fine/advanced ceramics), LED irradiation system designers, research institutions and conformity assessment bodies performing standardized performance tests (e.g., antibacterial testing, pollutant decomposition) on semiconducting photocatalysts that respond at 365 nm UV‑A. It supports reproducible, comparable performance testing using modern mercury‑free UV‑LED technology.

Related Standards

ISO 10677 - for irradiation equipment using conventional UV sources (fluorescent lamps).
Application standards such as ISO 27447 (antibacterial performance testing) reference UV irradiation requirements and can adopt ISO 10820 for LED‑based light sources.

Keywords: ISO 10820, UV‑LED, UV‑A 365 nm, photocatalytic materials, semiconducting photocatalyst, optical radiometry, UV radiometer, spectroradiometer, irradiation equipment, fine ceramics.

Related standards

Mentioned in the description and other ISO standards

Abstract

Overview

Key topics and requirements

UV‑LED spectral characteristics
- Peak wavelength: 365 nm ± 5 nm
- Full width at half maximum (FWHM): ≤ 10 nm
- Cut-on wavelength: 345 nm ± 5 nm (recommended)
- Cut-off wavelength: 385 nm ± 5 nm (recommended)
LED drive and stability
- UV‑LED chips shall be driven by direct current (DC) only.
- UV irradiance stability requirement: ≤ 1.25 %/h (measured at start, end and each 1‑h interval during tests).
- Replacement: replace UV‑LED chips when irradiance falls to 70% of initial value.
Irradiation uniformity
- Uniformity U = |Eav − Emin| / Eav × 100 (%), where Eav is average and Emin is minimum irradiance on the sample surface.
- For multi‑chip arrays, use identical chips (same manufacturer/catalogue) and consider wavelength selection to ensure uniform spectral output.
Optical radiometry requirements
- UV radiometers: spectral responsivity should be constant over 310–400 nm or calibrated against a matching spectral source; measurements traceable to national metrology.
- Spectroradiometers: bandwidth ≤ 5 nm, calculation interval = bandwidth, and UV irradiance calculated by E = ∫315–400 E(λ) dλ. Calibration traceable to national spectral irradiance standards.
- Directional response (cosine) index f ≤ 8% (can be waived for parallel optics or single‑chip sources).
Reporting
- Test reports must include reference to ISO 10820:2025, equipment type/manufacturer/catalogue, radiometer/spectroradiometer details, and measured UV irradiance at the sample.

Applications and users

Related Standards

ISO 10677 - for irradiation equipment using conventional UV sources (fluorescent lamps).
Application standards such as ISO 27447 (antibacterial performance testing) reference UV irradiation requirements and can adopt ISO 10820 for LED‑based light sources.

Keywords: ISO 10820, UV‑LED, UV‑A 365 nm, photocatalytic materials, semiconducting photocatalyst, optical radiometry, UV radiometer, spectroradiometer, irradiation equipment, fine ceramics.

ISO 10820:2025 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and users

Related Standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and users

Related Standards

Related standards

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