Recognize the specifications of the warning suit

In recent years, the occupational safety and health of employees in China have been highly valued by leaders and authorities at all levels. The National Standardization Management Committee and the State Administration of Work Safety have strengthened their leadership in the revision of personal protective equipment standards, and organized and approved the implementation of a number of new standards. The standard of warning service was introduced in this context. This standard is modified to adopt the widely recognized European standard EN471 "Professional Use of High Visibility Warning Clothing - Testing and Methods", and developed in conjunction with national conditions. The content is more comprehensive and detailed, and can fully satisfy the use in many occupational environments. Claim. The introduction of the standard has made China one of the first countries in Asia to have a warning uniform standard.

In the standard of warning clothing, the level of professional high-visibility warning clothing is specified; the performance and testing methods of fluorescent materials and reflective materials; the location of the use of reflective materials; the signs of clothing, etc. Fluorescent materials are visible light materials that emit longer wavelengths than absorbed light, provide higher brightness and color contrast than the surrounding environment, and are brighter and more visible than non-fluorescent materials. The standard specifies three colors of fluorescent materials: fluorescent yellow, fluorescent orange and fluorescent red, of which the first two colors are more common.

Since the fluorescent molecules in the fluorescent material absorb short-wavelength light, particularly ultraviolet light waves, visible light with lower energy and longer wavelength is emitted again. Therefore, fluorescent fabrics have vivid and eye-catching colors due to the abundant of ultraviolet light waves on cloudy days or in the early morning and at dusk, and thus have high visibility and alertness. Fluorescent light can only shine when it is exposed to sunlight during the day, and it does not emit light in the dark. That is, fluorescent materials do not have high visibility at night.

Reflective material, also known as retroreflective material or retroreflective material, has the retroreflective property of reflecting incident light back along the direction of the light source. That is, when a beam of light strikes a surface, the reflected light can follow the incident light. The opposite direction back to the light source. It is worth noting that: Retro-reflection is one of the reflection phenomena of light and is an optical phenomenon that requires the irradiation of a light source to occur. The reflective material can greatly enhance the wearer's visibility when the light is dim or at night through the illumination of the headlights, and has high visibility and alertness. The combination of performance materials combines the properties of fluorescent and reflective materials to achieve both fluorescent and reflective properties.

The coefficient of retroreflection is the main parameter to describe the retroreflective performance of retroreflective materials, and it is also one of the main indicators for evaluating the reflective properties of retroreflective materials. The retroreflection coefficient changes with the observation angle and the incident angle. The coefficient of retroreflection, also known as the coefficient of retroreflection or the intensity of reflection, is the value of the candlelight of a material per unit area of ​​illumination, in units of cd/(lx.m2).

In the standard of warning clothing, three levels of single performance reflective material and one level of combined performance material are specified according to the retroreflection coefficients at different incident and observation angles. In high-risk environments, high-grade reflective materials should be selected. In the physical performance requirements of reflective materials, the standard stipulates that after the reflective materials have been subjected to tests such as wear resistance, flexion, low temperature bending, temperature change, water washing, dry cleaning, and rain, they have been observed at an observation angle of 12° and an incident angle of 5°. The retroreflectivity of a single performance material is greater than 100 cd/(lx.m2), and the retroreflectivity of a composite material is greater than 30 cd/(lx.m2). The requirements of these technical indicators are designed to ensure the performance and safety performance of the warning suits.

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