Verification Process UNI EN 20471

UNI EN 20471 specifies requirements for garments that signal the wearer's presence in hazardous situations in any daylight condition and with vehicle headlights in the dark (including the performance requirements related to colour, retro-reflection, minimum areas and availability of materials, test methods to test the effectiveness of materials and entire devices).

The technical standard is structured primarily into the following parts:

  • Design;
  • Requirements for background and combined performance materials;
  • Performance requirements for photometric and physical retro-reflective material and material with combined performances;
  • Test methods;
  • Maintenance labelling;
  • Marking.


    The garments taken into account are:

    • Work suits;
    • Jackets;
    • Vests;
    • Undervests;
    • Overalls with braces;
    • Waisted trousers;
    • Braces;

    Warning clothing is grouped into three classes, each of which must have minimum areas of incorporated materials, divided between:

    • Bottom material;
    • Retro-reflective material;
    • Combined performance material.

    The high visibility vests and braces must be made of materials that comply with class 2, and have the following minimum areas of visible material:

    • Bottom material (fluorescent coloured material that must be highly visible):>= 0.50 m2;
    • Retro-reflective material:>= 0.13 m2.

    The arrangement must conform to what is shown in INFORMATION APPENDIX B of the standard.

    The retro-reflective material band should be at least 50 mm wide.

    The undervests must have either:

    • two horizontal bands of retroreflective material around the chest, spaced at least 50 mm apart, and bands of retro-reflective material that, passing over each shoulder, connect the upper chest band from front to back.The lower edge of the lower chest band must be at least 50 mm above the lower edge of the undervest;
    • a horizontal band of retro-reflective material around the chest and retro-reflective material bands, which, passing over each shoulder, join the chest band from front to back.The lower edge of the chest band must be at least 50 mm above the lower edge of the undervest;
    • two bands of retro-reflective material around the chest spaced at least 50 mm apart.The lower edge of the lower chest band must be at least 50 mm above the lower edge of the undervest;

    The undervests must be so constructed that, when worn by a person of the size for which they were designed, the side openings are not more than 50 mm horizontally.

    The braces should include a retro-reflective band around the waist and other retro-reflective bands, passing over each shoulder, that join the horizontal band from front to back; the bands must be at least 30 mm wide.

    Sizes must be in accordance with the requirements of EN 340:1993.

    The colours may be three, namely:

    • fluorescent yellow;
    • fluorescent orange-red;
    • fluorescent red;

    and must comply with the trichromaticity coordinates and luminance factor referred to SCHEDULE II of the harmonised standard.If the bottom material is for combined performance (i.e. presenting the properties of the underlying material and those of the retro-reflective material), the values ​​to be respected are those of SCHEDULE III.

    With regard to parameters such as:

    • colour fastness to rubbing, perspiration, washing, dry cleaning, bleaching with hypochlorite and ironing;
    • tensile strength of woven materials, the outbreak of knitted materials, tensile and tear strength of coated and laminated fabrics;
    • resistance to water penetration;
    • resistance to water vapour and permeation rate of water vapour;
    • ergonomics;

    it is necessary to refer to the points from 5.2 to 5.7 of the harmonised standard.

    Maintenance labeling

    The washing or cleaning instructions must be disclosed in accordance with ISO 3758.The maximum number of processes must be shown after the word "max".

    General marking

    Each signalling garment must be marked.

    The marking must be:

    • on the product itself or on labels attached to the product;
    • positioned so as to be visible and legible;
    • lasting for the specified number of cleaning processes.

    Specific marking

    Must include the following information:

    • name, trademark or other means of identification of the manufacturer or its authorised representative;
    • designation of the type of product, trade name or code;
    • designation of sizes according to EN 340;
    • standard EN 20471;
    • pictogram and, if applicable, level of performance.

    Instructions for use

    • They must be written at least in the official language of the country of destination and must include:
    • guidance on how to put on and remove the garment, if necessary;
    • warnings on the incorrect use, if necessary;
    • limitations of use;
    • how to properly store and maintain the product, with the maximum permitted periods between one maintenance operation and the next;
    • how to clean and decontaminate the product correctly, with complete washing or dry cleaning instructions;
    • the number of cleaning processes possible without decreasing the garment's level of performance.

    The ANCCP Certification Agency offers its service of verification and control of high-visibility clothing subject to washing and maintenance, certifying that the process of verification and control of high-visibility clothing subject to washing and maintenance is in accordance with standard UNI EN 20471.

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