PPE

Know the specifications of warning clothing

in recent years, the occupational safety and health of employees in China has been highly valued by leaders and competent departments at all levels. The State Administration of standardization and the State Administration of work safety have strengthened their leadership in the formulation and revision of personal protective equipment standards, organized the preparation, approval and implementation of a number of new standards. The standard of warning clothing was issued in this context. The standard is revised and adopted the widely recognized European standard EN471 “high visibility warning clothing for occupational use – Testing and methods”, and combined with the national conditions. The content is more comprehensive and detailed, and can fully meet the requirements of many occupational environments. With the introduction of the standards, China has become one of the earliest countries in Asia to have warning clothing standards

in the standard of warning clothing, the level of high visibility warning clothing for occupation is specified; Performance and test methods of fluorescent and reflective materials; The use position of reflective materials; The logo of clothing, etc. Fluorescent material is a kind of visible light material which can emit longer wavelength than absorption light. 1t can provide higher brightness and color contrast than the surrounding environment. 1t is brighter and more visible than non fluorescent material. There are three kinds of fluorescent materials in the standard: fluorescent yellow, fluorescent orange red and fluorescent red, the first two of which are more common

because the fluorescent molecules in the fluorescent materials absorb the short wavelength light, especially the ultraviolet light, and then emit the visible light with lower energy and longer wavelength. Therefore, fluorescent fabrics in cloudy days or in the early morning and dusk, due to sufficient UV light, still have vivid and eye-catching color, which has high visibility and warning effect. Only when the fluorescent material is exposed to sunlight in the daytime, it will not emit in the dark, that is to say, the fluorescent material does not have high visibility at night

reflective material, also known as retroreflective material or retroreflective material, has the retroreflective property of reflecting the incident light back along the direction of the light source, that is, when a beam of light hits a surface, the reflected light can return to the light source along the opposite direction of the incident light. 1t is worth noting that retroreflection is one of the reflection phenomena of light, and it is an optical phenomenon that needs the illumination of light source. The reflective material can greatly enhance the visibility of the wearer in the dim light or at night, and has high visibility and warning effect. Combined performance materials integrate the characteristics of fluorescent materials and reflective materials to achieve both fluorescent and reflective properties

the retroreflective coefficient is not only the main parameter to describe the retroreflective performance of reflective materials, but also one of the main indexes to evaluate the retroreflective performance of reflective materials. The coefficient of retroreflection will change with the change of observation angle and incidence angle. Retroreflection coefficient, also known as regression reflection coefficient or reflective intensity, is the candlelight value of material in unit area and unit illumination, and the unit is CD / (LX – m2)

in the standard of warning clothing, three levels of single performance reflective materials and one level of combined performance materials are specified according to the retroreflective coefficient of different incident and observation angles. When working in high risk environment, high grade reflective materials should be selected. 1n the physical performance requirements of reflective materials, the standard stipulates that after the test of wear resistance, flexion, low temperature bending, temperature change, water cleaning, dry cleaning, rain and so on, the reflective materials can be tested in 12 ° Observation angle, 5 ° Under the condition of incident angle, the retro reflection coefficient of single performance material is greater than 100 CD / (LX – m2), and that of composite performance material is greater than 30 CD / (LX – m2). The requirements of these technical indicators are aimed at ensuring the wearing performance and safety performance of the warning clothing

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