Firefighters clothes are made of which material
Firefighters clothes are made of which material? It is one of the most basic and important equipment to protect the safety of front-line firefighters. The fireman’s protective clothing usually has a fr fire retardant reflective fabric, which allows the firemen to have better visibility in the light of light, and to ensure the safety of the firemen.
Firefighting is one of the most selfless and fearless occupations in the world today. Because no matter how dangerous the working environment is, the firemen must rush into the fire without hesitation, leaving safety to others and keeping danger to themselves. Therefore, it is particularly important to adapt to fire scene rescue activities.
Firefighters are usually in the heat environment of very high temperature. The radiation heat of the fire field can burn the human body: the heat in the fire field is more than the normal physiological endurance of the human body. It will hurt the artificial weight to different degrees, and can cause death when it is serious. In such a dangerous environment, firefighters should protect their own safety, not only equipped with protective equipment such as head, hand, foot and respiratory tract, but also protective clothing. The basic requirements of fire protective clothing are flame retardant, heat insulation and high temperature resistance. In addition, the fire scene is smog, the visibility is low, and the visibility of the firefighters is very important, so the firefighter’s protective clothing usually has a reflective belt, and the hat or helmet also has such a sign. This ensures that firefighters have better visibility under dim light conditions.
The role of reflective materials in firefighters clothes
The firefighters clothes usually has 4 layers of structure: outer layer, waterproof and breathable layer, heat insulation layer and comfortable layer. The outer layer is used to resist flame and heat; the waterproof breathable layer clings to the outer fabric to prevent the permeation of water and harmful chemicals to ensure good air permeability; the heat insulation layer is a needle punched fabric or nonwoven fabric that prevents heat conduction; the comfort layer is the most inner layer and makes the wearer wear more comfortable, usually it is Sewn with heat insulated linings. The reflective tape is usually sewn on the tops, sleeves and trousers of the protective clothing. The position of the reflector band. Ensure that the wearer can be seen in the direction of 360 degrees.
In foreign countries, the relevant standards for fire-fighting clothing, such as the European standard EN469 and the American Fire Protection Association standard NFPA. All the protective clothing must have a reflective strip. In the dark environment of night or light, this kind of reflective strip has obvious anti light function when the light is illuminated, which produces striking effect and improves the visibility of the wearer. The personnel in the light source can find the target in time, thus effectively avoid the accident and ensure the safety of the employees.
Reflection principle of reflective materials
There are three kinds of light reflection phenomena in nature: the first one is diffuse reflection. The reflection usually occurs on the surface of the rough object, and after the incident light is illuminated on the surface of the object, the reflection occurs in all directions: after the parallel beam is irradiated, the reflected light is irregularly reflected in all directions, as shown in Fig. 1.
The second is mirror reflection. It usually occurs on the surface of a smooth body. Parallel light is reflected on the surface of a smooth object, reflecting the phenomenon of specular reflection, as shown in Fig. 2. The reflected light emits parallel light, and the reflected light and incident light are symmetrically distributed on both sides of the normal line. The incident angle is equal to the reflection angle.
The third is the regression reflex. It refers to the phenomenon of light shining on the reflecting strip and reflecting back along the direction of the observer, as shown in Fig. 3.
Materials with retro reflective properties are often referred to as retro reflective materials, or reflective materials. This light reflection mode allows motorists to identify people and objects with reflectors in the distance through the front car lights.
Reflective material for firefighters clothes – glass bead reflective fabric
At present, two different processing technologies are used for reflective materials: microlens technology and Microgrid technology. This article only introduces the glass microsphere reflector made of micro lens technology on firefighters clothes. The reflective material is made of microlens technology, and the reflector is coated on the back of the glass bead. As the refractive index of glass and air is different, the light is focused on the glass beads and the focus falls on the reflective layer on the back of the glass beads. The light is reflected and refracted, and the beam is reflected back in the direction of the incident. The reflective material made from this principle is called “micro lens type reflective material”. The principle is shown as Figure 4 (a). If the structure of the glass bead is not ideal, after the beam is focused by the glass bead (microlens), the focus cannot just fall on the reflection layer, and the effective regression reflection cannot occur, such as Fig. 4 (b), Fig. 4 (c).
The relationship between the refractive index of microlens glass beads, the particle size of glass beads and the focal position (Jiao Ju) formed after light converging is in accordance with the following formula:
F=r (2-n) /2 (n-1) +r (1)
Formula: f- converging focal length is the distance from the center of lens to the focus.
R- glass bead radius;
The refractive index of n- glass microspheres.
The formula (1) shows that the refractive index of glass beads and the radius of the beads affect the focal length directly. The reflective layer on the back of glass beads is usually silver coated with glass beads or aluminum plated.
Based on the special use of the fire wear environment, the European standard EN469 and the American Fire Association standard NFPA stipulate the heat resistance and flame retardancy of the reflector: the reflector must have the flame retardancy, cannot melt, and do not drop the flow. According to ASTMD6413 (American material testing Society) “standard test method for refractoriness of textile materials” (vertical test method) or European standard for EN532 flame propagation test, the reflector must be extinguished in 2S after the flame is produced and the length of carbonization should be less than 6 “. In the NFPA standard, the average carbonization length of materials should not exceed 4 “. China’s GA10 2002 “fireman fire protection clothing” standard stipulates that the time of the return of the reflective marking zone should not be greater than 2S, no melting without dropping, and no breakage, falling off and discoloration after 25 times of washing.
The reflective material used in fire-fighting clothes is designed to indicate the location of firemen in performing their duties. Sports can enhance visibility. Therefore, reflective materials are usually located in areas where arms, head and feet are frequently moving.
WEALLIGHT provides a variety of FR fire retardant reflective fabric: silver gray flame retardant reflective fabric; fluorescent color (fluorescent yellow, fluorescent orange red) in the middle is silver gray flame retardant reflective strips: fluorescent orange red reflective ribbon / fluorescent yellow flame retardant reflective fabric.
In addition, in the US NFPAl971, firefighters’ protective clothing is provided with reflective strips, and fluorescent materials are required on the reflective strips. Fluorescence refers to the short wavelength light coming to the surface of the material, which can emit long wavelengths of light. Under the conditions of day or light. Compared with ordinary non fluorescent material. Fluorescent dyes or pigments in fluorescent materials can transmit hundreds of times of light and have high visibility. Fig. 5 shows the American firefighter’s fire-fighting clothing; Fig. 6 is a German fireman’s protective clothing; Fig. 7 is a Chinese firefighters clothes.
WEALLIGHT reflective material
WEALLIGHT is a Reflective Material Manufacturer and Supplier. Our reflective materials, not only excellent reflective performance, but also safe and reliable, the reflective materials do not contain heavy metals, azo dyes or pigments that are harmful to the human body.
The international reflective materials are not only used in firefighters clothes, but also widely used in many other industries: police, railway, highway, municipal, sanitation, emergency rescue, road mapping, mine, marine rescue, underground work, field work and other industries, all equipped with reflective materials. In the consumer goods market, people’s daily life of clothing, shoes and hats, gloves, bags, rain gear, especially in the daily life of the elderly, children, disabled and urban residents in daily life textiles. The reflective materials have been used in succession.
We accept customer‘s own designs and OEM design orders. Our main product: reflective fabric, reflective tape, heat transfer vinyl, glow heat transfer film and so on.
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