Document RyBDNR2vD3EkqB6k96vdEXZa

tenstics of the wearer (such as hair and head structure), need for eye protection, and other factors Selection ot hearing protectors No matter how good a hearing protective device may be, its comfort has a great deal of influence on how well it will be accepted Some people cannot wear plugs for physical or psychological reasons Others may not be able to wear muffs Consequently, many hearing conservation programs will include both types so the user may select the one most acceptable to him Face and Eye Protection Protection of the eyes and face from injury by physical and chemical agents or by radi ation is vital m any occupational safety pro gram In fact, this type of protection has the widest use and the widest range of styles, models, and types The eye and face protection standard. Prac tice for Occupational and Educational Eye and Face Protection (Z87 1), is a fairly com prehensive document It sets performance standards, including detailed tests, for a broad area of hazards--excluding only X rays, gamma rays, high-energy particulate radia tions, lasers, and masers Besides general requirements, applying to "all occupations and educational processes," the standard piovides requirements on the following Rigid welding helmets Welding hand shields Nonngid welding helmets Attachments and auxiliary equipment--lift fronts, chin rests, snoods, aprons, magnifiers, etc Flammability Face Shields Goggles--eyecup (chipper's), dust and splash, welder's, and cutter's Spectacles--metal, plastic, and combina tion Some of the requirements of the standard are stated generally For example "Aprons or bibs for helmets shall be of nonflammable, nonconducting material that is flexible and capable of withstanding disinfection " Other requirements are more precise As regards flammability, for example--"The thmnest section of the ngid helmet or hand shield shall not bum at a rate greater than 3 in per minute when tested by inserting one end of a 5 by 1& in stnp of the helmet material in a blue-flame Bunsen burner The most significant changes of Z87 1 from the previous Z2 1-1959 Standard are A stringent requirement for the impact resistance of the lens when in frames The revision illustrates the test block with two figures and prescribes that "A 100-m di ameter steel ball, weighing approximately 2 4 oz shall be dropped m free fall from a height of 50 in onto the horizontal upper surface of the lens, impinging the lens within a circular area of a %-m diameter centered at the lens mechanical [geometric] center The lens shall not be chipped and the lens shall not be dis placed from the frame eye m this test " Sup plementing this test for lens m frame--glass and plastic--are impact resistance tests for lens on block and breakage pattern Also specified are tests for penetration resistance (plastic), flammability (plastic), haze (plas tic), and ultraviolet, luminous, and infrared transmittance (plastic and glass) A new requirement for lenses in welder's and cutter's goggles to be hardened to meet impact resistance requirement "All glass fil ter lenses or plates shall be heat-treated and meet the impact-resistance require ments A specific selection chart for eye and face protection, including recommendations for particular hazards and operations The chart also includes line drawings of 11 types of goggles, spectacles, shields, and helmets (see Fig 19-15) Disinfection requirements are more exact --"Completely immerse the protector for 10 minutes m a solution of modified phenol, hy pochlorite, or quaternary ammonium com pounds at a room temperature of 68 F 479