Protective glasses types and uses

    Protective eyewear is a special role to play in the glasses , using the different needs of different occasions glasses . Such as hospital surgical glasses , welding glasses when using welding , laser engraving laser protective glasses, and so on. Protective glasses , also known as labor glasses, safety glasses and protective mask is divided into two categories, the main role is to protect the eyes and face from UV , infrared and microwave electromagnetic radiation , dust , soot, metals and gravel debris and chemical solutions sputtering damage.
First, the types of safety glasses and use:
1 pieces are solid proof protective glasses, mainly for defense and other metal debris or gravel mechanical damage to the eyes . Glasses and eyeglass frames should be rugged , anti- shock. Cover fitted around the edge of the frame , on which there should be vents. Protective lenses can be used tempered glass, glass or copper mesh glial adhesion HENGDA fire goggle .
2 anti-chemical solution protective glasses, mainly for defense irritation or solution corrosive chemical damage to the eyes . Can use an ordinary plain lenses , frames should be covered to prevent splashing into the solution . Typically used in laboratories , hospitals and other places , the general medical glasses GM.
3 . Radiation protection glasses, too strong for defensive ultraviolet radiation damage to the eye. Lenses using radiation can be reflected or absorbed , but it can be made visible through a special glass. Lens bright chromium plated , nickel , mercury or silver metal thin film numbers , may reflect radiation ; blue lenses absorb infrared , yellow lenses absorb ultraviolet and infrared, colorless lenses absorb X -rays and lead γ rays. For example, common welding glasses, the lens transmittance requirements are relatively low, so the lens color ink mostly dominated ; laser protective eyewear , by definition, can prevent the laser radiation on the glasses , so the lens is demanding, such as for select the decay rate of the light source , the light reaction time, optical density , light effects, different nanometer (nm) laser wavelength requires different lenses .
Second, protective masks are the following :
1 anti- bodies late cuttings and chemical solution splashed into eyes and damage to facial HENGDA fire hood , plastic overlay on both sides and the lower production of transparent plastic with a lightweight , multi-use polycarbonate , respectively, under the ears and toward the lower amount of neck extension , so that the mask can be more fully coated face to enhance the protective effect.
2 heat addition heat protective clothing mask mentioned foil mask , the metal can also be single or double mesh made ​​, but double as well, part of the radiation is blocked and can heat the air. As can be chrome or nickel , can enhance the effect of heat reflection , and to prevent rust .
3 metal mesh mask can also be anti-microwave radiation.
4 welders mask , with a thickness of cardboard fiber, light , heat , and has good electrical insulating mask.

Common types of fire goggle range

    ① ordinary optical glass mirrors. By ordinary optical glass lenses, prevention turner, grinders , milling , drilling work , boring work , riveter, sand workers, workers of mechanical damage modeling and acid-base operation , testing, sampling acid burns , the driver anti- foreign objects into the eyes .
    ② UV mirror. In the optical glass melt into the UV-absorbing chemicals, for visible light , ultraviolet absorption rate . Depending on the type of work required lenses are mounted on the frame , mask or helmet. Welding is now made ​​of mirror LCD , glare can be met at the moment 0.001 ~ 0.002s black, protective welding operator electric ophthalmia does not occur.
    ③ HENGDA fire goggle . By the high temperature glass lens can absorb some infrared, smelting operations for blast furnace workers , fireman , blacksmith , watching fire workers, founder , glaziers and so on.
    ④ radiation goggles . In the optical glass is added to the lead for Χ rays , γ -rays , α -rays , β -rays workers .
    ⑤ microwave goggles . The outer surface of the optical glass with a thin layer of metal powder, stannous oxide , for microwave operation.
    ⑥ anti- laser mirrors. Shape for the goggles type, multi-use synthetic polymer lens material, can be replaced. According to the principle of anti- laser radiation , anti- laser glasses into reflective, absorption , reflection absorption -type explosion -type , photochemical reaction type and color glass-ceramic type.
    Note the use of protective eyewear
    Multi- material protective glasses made ​​of glass , should be taken to avoid collision fragmentation. High-speed operation in the event of splashes , the lens may be broken , and damage to the eyes, to take preventive measures, such as the lens plus a layer of metal mesh . At the same time frame to prevent damage to the lens by grinding into the box when not in use . Lead ions within the anti- ray lenses , easily oxidized white, affecting light transmission, should be replaced. The anti- laser glasses were marked by anti- wavelength optical density values ​​and not misused .

Protective effect of protective glasses and protective mask

    Protective glasses and protective eye and face protective masks mainly from ultraviolet , infrared and microwave electromagnetic radiation , dust , soot, metals and chemical solutions sputtering gravel and debris damage .
    ( 1 ) protective glasses commonly made ​​of flexible plastic and rubber , box large enough to cover the user's eyes .
    Anti solid debris protective glasses, mainly for defense and other metal debris or gravel mechanical damage to the eyes . Glasses and eyeglass frames should be rugged , anti- shock. Cover fitted around the edge of the frame , on which there should be vents. Protective lenses can be used tempered glass, glass or copper mesh glial adhesion goggles .
    Anti- chemical solution HENGDA fire goggles, mainly for defense irritation or solution corrosive chemical damage to the eyes . Can use an ordinary plain lenses , frames should be covered to prevent splashing into the solution .
    Radiation protection glasses, too strong for defensive ultraviolet radiation damage to the eye. Lenses using radiation can be reflected or absorbed , but it can be made visible through a special glass. Lens bright chromium plated , nickel , mercury or silver metal thin film can be reflected radiation ; infrared absorbing blue lens , green lens absorb ultraviolet and infrared, colorless lenses absorb lead X -rays and γ -rays .
    ( 2 ) HENGDA flash hood are the following :
    The end of the anti- bodies and debris chemical solution splashed into eyes and face mask facial injuries , plastics, and the lower sides with a light overlay of transparent plastic production , the use of polycarbonate were under the ears and neck extending toward the lower amount , so that the mask more fully coated face to enhance the protective effect.
    Heat addition heat protective clothing mask mentioned foil mask , the metal can also be single or double mesh made ​​, but the bilayer as well, part of the radiation is blocked and can heat the air. As can be chrome or nickel , can enhance the effect of heat reflection , and to prevent rust .
    Metal mesh mask can also be anti-microwave radiation.
    Welders mask , with a thickness of cardboard fiber, light , heat , and has good electrical insulating mask.

Regular fire blanket in the home

Fire blanket is mainly used in enterprises, shopping malls, ship, automobile, civil buildings and other places of a simple initial fire fighting tool. Especially suitable for the family and the restaurant's kitchen, hotel, entertainment, gas stations and other places of some burns easily. To prevent fire spread and protection to escape.

At the beginning of the fire, the fire blankets directly covered the fire, the fire can be extinguished in a short time. In the event of a fire, the fire escape blanket drape on their bodies wrapped in or saved object body, rapid escape from the fire, to save your evacuated or security provides a good help. If really appear after fire accident, can be put on the fire blanket, it can greatly reduce the risk of burns. For must be far away from heat source body, is one of the most ideal and effective outer protective layer, and very easy to wound surface uneven objects, enterprise, store, ship, automobile, civil buildings on a simple fire extinguishing tools, especially suitable for the family kitchen, hotel, entertainment, gas stations and some other burns easily, prevent fire spread.

Fire blanket by fibrous insulation refractory refractory fiber. Refractory fiber with general fiber properties, such as soft, elastic, there is a certain tensile strength, it can be further processed into a variety of paper, line, rope, belt, carpet and carpets and other products. Also has the general fiber have no high temperature resistant, corrosion resistance. As refractory and heat insulation material, has been widely used in metallurgical, chemical, machinery, building materials, shipbuilding, aviation, aerospace and other industrial sectors. Its main characteristic is non-combustible, resistant to high temperature (550 ~ 1100 ℃), texture soft, smooth, tight, and do not stimulate the skin, and the need to stay away from heat source body of people, is an ideal and effective outer protective layer, and very easy to wound surface uneven objects, in the case of without damage can be reused.

Fire blankets

fire blankets through special processing of glass fibers 12 hs satin fabric, tight structure and high temperature resistance, can well protect the object from the heat and spark zone, and prevent or isolation of combustion. Fire blanket thickness of only 1.0 mm, resistance to high temperature of 550 degrees, frame structure and can be used in the shipbuilding industry to the ship repair; Can also be used in the petroleum chemical industry enterprise in metal structure welding, heat insulation, insulation and need showed good protective adaptability.

Fire blankets applicable to large supermarkets, shopping malls, hotels and other public places of entertainment for hot construction: such as welding, cutting and breaking, and to ensure people's life safety and property of complete, compared with asbestos, without the risk of cancer. And fire blankets soft and resilient, wound surface is uneven and equipment choice of object, can also replace refractory low temperature fireproof fabric, is a kind of more economic fire layer and block fire curtain.

The use of standard safety shoes

Safety shoes are shoes and protective safety class class shoes collectively , but also a labor supplies . Protect feet and legs from foreseeable harm footwear.

PPE European standard EN344: 1997 " special security , protection , and work shoes ."

The standard safety shoes models design, the entire shoe uppers, shoe , tongue , insole , outsole and other structures and performance indicators were provided . Each item specified in the standard test methods and other similar standards similar to its principle of the method is also generally applicable to most safety shoes , the main indicators are:

a. Baotou impact resistance steel with a prescribed weight impact test hammer , Baotou Baotou upon impact should be less than the clearance height of the specified value , and Baotou in the axial direction of the test should be no penetrating cracks. It is noteworthy that the national standards of the hammer weight , size , height and impact testing machine structure different from the requirements such as the actual test should be distinguished.

b. puncture resistance test machine is equipped with a plate, nail plate is equipped with a test , the test is a truncated tip of the nail head , nail head should be greater than the hardness of 60HRC. The sole sample is placed on the test machine 's chassis , the position can test for nail piercing through the outsole , the test nails to pierce the speed 10mm/min ± 3mm/min soles until penetrate far, record the maximum required force . Each four points selected on the sole test ( of which at least one point of the heel ) , each point distance of not less than 30mm, and the distance from the inner bottom edge than 10mm. A non-slip bottom block , between the blocks should be pierced. 4 points in the two points should be located away from the implant bottom corner edge line distance of 10-15mm for testing. If the humidity will affect the results , soles should be soaked before testing plus 20 ℃ ± 2 ℃ deionized water 16 ± 1h.

c. conductive anti-static shoes, shoes and fireproof shoes like electrical performance through in the dry and wet atmospheric adjustment , will be filled with people clean the ball and put it inside the shoe metal probe device, using a predetermined resistance testing instruments, measuring the first two probe between probe and the third resistor. Under normal circumstances, conductive shoes required resistance should not exceed l00K ohms ; Anti-static shoes should be required 100K ohm resistor to 100M ohms.

d. insulation performance with a shoe as a sample , the inner end of the thermocouple installed at the center of the connection area , and the person filling ball shoes . Adjusting the temperature of the sand bath pot to 150 ℃ disabilities 5 ℃, the shoe placed thereon , so that the sand contacts the shoe outsole , with the temperature of the thermocouple connected to the testing apparatus , measuring the temperature inside the end of the corresponding time , given the increase in the temperature curve . Calculated from the sample placed on a sand bath after 30min from the increase in temperature . General requirements insulated shoes inner bottom surface temperature increase is less than 22 ℃.

e. heel portion of the energy absorption performance test instrument's maximum compression load 6000N, with a record load / deformation characteristics of the device. The shoe will take place with a steel plate , the test punch in the center portion of the inside of the heel against the inner sole . 3mm/min with disabilities speed 10mm/min load is applied . Draw the load / compression curve and calculate the absorbed energy E, expressed in joules .

f. slip outsole for the standard specifies requirements for non-slip soles coefficient test , but the skid block designs, specifications , etc. made ??provisions, such as the thickness of the sole , skid block height , the distance between the edge of the sole , etc. are required .