Overview
ISO 17514:2024 - Time‑measuring instruments - Photoluminescent deposits - Test methods and requirements is the second edition (2024) international standard that specifies laboratory and inspection methods for photoluminescent deposits applied to time‑measuring instruments (hands, dials, bezels). It replaces ISO 17514:2004 and consolidates modern test procedures for activation, stability and performance of photoluminescent materials used on watches, clocks and related components.
Key topics and technical requirements
- Scope and purpose: Defines test methods and pass/fail requirements for photoluminescent deposits on timepieces and components.
- Test sample preparation: Example method - apply (30 ± 1) mg of deposit to a (1 ± 0.03) cm2 white support (RAL 9003 or equivalent) with homogeneous thickness.
- Activation and luminous measurement:
- Use a D65 light source (400 lx for 20 min or 500 lx for 10 min) to charge samples.
- Measure luminous intensity (expressed in ncd - nanocandelas) for up to 7 hours after activation; measurements typically taken continuously or at least hourly.
- Ageing resistance:
- Accelerated light ageing with an energetic dose of 7.8 MJ/m2 using xenon or metallic halide lamps with specified irradiance and exposure durations.
- Visual inspection and luminous intensity loss limits: intensity loss shall not exceed 10% (hourly measurements).
- High/low temperature resistance:
- Exposure at (80 ± 5) °C and (−20 ± 5) °C with visual inspection and ≤10% luminous intensity loss requirement.
- Visibility and legibility tests:
- Procedures for visual detection (recommended inspection distances) and legibility limits to ensure read‑ability in the dark.
- Adhesion: New in this edition - adhesion test methods and requirements for deposits on components.
- Color and appearance checks: Visual comparison under D65 or Lab* measurements; samples should be in a comparable state of charge.
Applications and users
ISO 17514:2024 is relevant to:
- Watch and clock manufacturers and component suppliers
- Materials and luminescent pigment producers
- Quality control and product testing laboratories
- Certification and compliance bodies
- Product designers and R&D teams validating night‑time visibility and durability
Practical uses include batch acceptance testing, material development, supplier qualification, and design verification for luminous performance and environmental durability.
Related standards
- ISO 14368‑4:2020 (equipment and conditions for accelerated sunlight ageing reference)
- ISO/CIE 11664‑2 (D65 spectrum definition)
- CIE/ISO colorimetric methods (Lab*, CIE 015)
- Historical references: ISO 3157 and ISO 4168 (radioluminescent methods - withdrawn)
Keywords: ISO 17514:2024, photoluminescent deposits, time‑measuring instruments, luminous intensity, ageing resistance, adhesion test, visibility, legibility, watch standards.