High-visibility clothing requirements
ISO 20471 evaluates clothing that makes the wearer more conspicuous to vehicle and machinery operators in daylight and under headlights.
Measures fluorescent and retroreflective areas on the finished garment.
Both minimum areas and garment design must meet the class. Class 1 may alternatively use 0.20 m² of combined-performance material.
| Garment class | Background material (m²) | Retroreflective material (m²) |
|---|---|---|
| 1 | 0.14 | 0.10 |
| 2 | 0.50 | 0.13 |
| 3 | 0.80 | 0.20 |
Measures background color coordinates and luminance factor β.
Color must fall within the permitted region and meet the minimum β.
| Fluorescent color | Minimum β |
|---|---|
| Yellow | 0.70 |
| Orange-red | 0.40 |
| Red | 0.25 |
Checks background color after cleaning and xenon-light exposure.
Color and luminance limits apply after the maximum declared cleaning count, or 5 cycles if unspecified.
Measures staining from rubbing and perspiration on the gray scale.
Minimum staining grade: 4 for rubbing and perspiration. Perspiration color-change grade: 4.
Measures tensile strength of woven materials and bursting strength of knitted outer materials.
Tensile strength ≥ 100 N in both directions. Knitted bursting strength ≥ 100 kPa at 50 cm² or ≥ 200 kPa at 7.3 cm². Coated and laminated materials: tear resistance ≥ 20 N.
Measures water-vapor resistance Ret and the permeability index.
Outside the rainwear route: Ret < 5 m²·Pa/W, or a permeability index ≥ 0.15 using measured thermal resistance. Rainwear follows its applicable classification.
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