Overview
ISO/TS 5385:2022 - Road vehicles: Anti-fog coating for exterior lighting devices - Specification - defines standardized test methods and requirements for anti‑fog coatings applied to the outer lenses of vehicle exterior lighting (glass, polycarbonate, PMMA or other materials). The Technical Specification helps manufacturers and test laboratories evaluate anti‑fog performance, durability and coating integrity under controlled laboratory and environmental exposures.
Key Topics and Requirements
The document describes specimen preparation, visual assessment and a suite of quantitative and qualitative tests:
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General conditions
- Standard laboratory environment: (23 ± 5) °C and (50 ± 10) % RH.
- Specimens preconditioned at least 24 h; minimum 3 specimens per measurement.
- Test specimens: plates or outer lenses with wall thickness 2–4 mm and coatings free from visible flaws.
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Coating thickness
- Method A: optical interference using manufacturer refractive index.
- Method B: cross‑section mean (ISO 2808) as alternative.
- Thickness must meet manufacturer recommended values at all measured points.
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Adhesion
- Per ISO 2409 cross‑cut procedure with pressure‑sensitive tape (≥ 4.5 N/cm peel strength).
- Adhesion classification: Grade 1 maximum.
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Anti‑fog performance
- Steam test (Method A & B): controlled steam exposure (e.g., 80 ± 2 °C water bath / 20 ± 1 s exposure; Method B at 40 ± 2 °C) with visual classification of water film. Method A accepts Class 1 or 2; Method B requires Class 1.
- Cyclic steam test: repeated steam cycles to assess long‑term durability until failure.
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Environmental durability
- High/low temperature tests, condensation water tests, environmental cycle tests, accelerated weathering (xenon‑arc per ISO 4892‑2) and outdoor exposure. Visual assessments follow ISO 13076 lighting/procedure.
Applications and Who Uses It
ISO/TS 5385:2022 is intended for:
- Automotive OEMs and tier‑1 lighting suppliers verifying exterior lamp performance.
- Coating formulators and manufacturers developing anti‑fog treatments.
- Independent testing laboratories and quality assurance teams performing type approval, R&D validation and production quality control.
- Regulatory bodies or procurement teams specifying performance criteria for lighting assemblies.
Practical uses include product development, batch acceptance testing, durability benchmarking and documenting compliance with industry best practices for anti‑fog performance.
Related Standards
- ISO 2409 - Paints and varnishes - Cross‑cut test (adhesion)
- ISO 4892‑2 - Plastics - Exposure to xenon‑arc lamps (accelerated weathering)
- ISO 13076 - Visual assessments of coatings
Keywords: ISO/TS 5385:2022, anti‑fog coating, exterior lighting devices, road vehicles, steam test, adhesion test, coating thickness, accelerated weathering, automotive lighting testing.