Overview
EN ISO 6719:2010 (ISO 6719:2010) specifies a standardized method for measuring the luminous reflectance characteristics of anodized aluminium and its alloys using integrating‑sphere instruments (reflectometers). The standard covers measurement of total and diffuse reflectance, and is also applicable to specular reflectance (principal gloss value), specularity and diffuseness. Note: the method is unsuitable for use with lighting reflectors.
Keywords: anodizing, aluminium, integrating sphere, reflectance measurement, specular, diffuse, EN ISO 6719:2010.
Key topics and technical requirements
- Measurement principle: Use of an integrating sphere to collect and integrate reflected light from a specimen; photometric measurement gives average reflected flux.
- Instrument components: light source, integrating sphere, photometer (photoelectric cell + multiplier and recorder).
- Spectral requirements: spectral product of source, filters and detector shall closely simulate CIE source C (or D65) with the photopic luminous efficiency V(λ) per ISO 11664‑2.
- Sphere geometry and ports:
- Internal surface must be highly diffusing and white across the visible spectrum.
- Total port area ≤ 5% of internal surface.
- Entrance and specimen ports centered on the same great circle with >170° arc between centres.
- Specimen port subtends 8° ± 1° of arc relative to entrance port centre.
- Photometer positioned at 90° ± 0.5° from the entrance port.
- Specular‑included vs. specular‑excluded:
- Pivotable‑sphere and fixed‑sphere (Type 1 and Type 2) arrangements are described to permit measurements including or excluding the specular component.
- For total reflectance the specimen is illuminated at 9° ± 1° to the normal; diffuse reflectance geometries are specified as well.
- Irradiation beam: substantially unidirectional (rays within 3° of beam axis); specified annulus subtended angles for entrance and exit ports.
- Practical requirements: housing to prevent ambient light; calibration and operation per manufacturer and use of reference standards.
Applications and users
- Quality control in anodizing plants and surface finishing operations to assess reflectance, gloss and diffuseness of anodized aluminium.
- Lab testing and R&D for coating development, process optimization and materials characterization.
- Manufacturers of reflectometers and test laboratories implementing standardized measurement procedures.
- Useful for acceptance testing, specification compliance and comparative surface studies.
Related standards
- ISO 7724‑2 (colour measurement)
- ISO 11664‑2 / CIE standard illuminants (spectral requirements)
- Supersedes EN 12373‑12:2000
EN ISO 6719:2010 provides repeatable, instrument‑based procedures to quantify reflectance properties of anodized aluminium surfaces for reliable quality assessment and specification control.
