Safety eyewear for extreme environments
June 2, 2008
A forklift operator at a major frozen foods company navigates his vehicle from the frigid environment of a giant freezer out to the loading docks in the blazing Florida sunshine as palettes of frozen juice are loaded on semis for delivery to retail outlets. His safety glasses are exposed to an extreme variation in temperature and humidity. The result is inevitable: fog, in the form of water condensation, appears on the lens surface. When this occurs, performing any task is made more difficult, and often more dangerous, because vision is obscured.
Move north to the General Mills grain elevators in Duluth, Minn. where outside temperatures can drop to more than 30 degrees below zero as the wind whips in off of Lake Superior. Inside the grain elevators, the temperature drops even lower as workers go from this bitterly cold environment to warmer locations within the plant. Although these two operations are nearly 1,700 miles apart, they share the same challenge: ensuring the safety of their workers in extreme environmental situations.
Safety managers know the importance of keeping safety eyewear in place when fog and condensation may begin to obstruct vision. The last thing they want is for any of their workers to remove their safety glasses to wipe the lenses. This could lead to situations that not only expose the eyes to danger, but also could potentially cause an accident.
Jim Collins, manager of global safety, wellness, and claims management at General Mills, shares that sentiment. “We have to eliminate any reason a worker feels he or she needs to remove safety eyewear in the course of doing their jobs. Lens fogging has presented a major challenge in having our workers comply with eyewear safety regulations,” says Collins.
Technology provides solutions
Fortunately, the technology is available to minimize the effects of fogging and condensation, enabling workers in extreme environments to perform their jobs safely, efficiently, and without interruption. In both locales, employees rely on eyewear with anti-fog coatings to counteract these conditions.
When an uncoated or hard-coated lens is exposed to extreme moisture or humidity, minute water droplets build up on the lens, which causes fogging. By using specialized anti-fog coatings on the lens, condensation is controlled to help keep vision clear.
This is the desired effect. If workers don’t have to remove their glasses to wipe them, their eyes remain protected at all times.
Chemical exposure is the extreme
The safety issues encountered at General Mills are just part of a long list of safety eyewear challenges encountered in various industrial applications â€” from food-processing to manufacturing to chemical handling â€” as well as healthcare, laboratories, and construction applications.
In addition to being able to withstand impact from all kinds of flying objects, safety eyewear must provide durability and scratch resistance from wood particles, metal projectiles and a host of airborne abrasive materials. Chemical splash resistance in the form of biological materials, solvents and petroleum products is another key property of protective eyewear.
To offer additional protection in these areas, companies should look for eyewear with lens coatings that are designed to significantly reduce scratching from airborne particles and protect eyewear lenses from the harmful effects of chemical exposure, adding longer life to the lens. For situations where workers are subject to chemical splash, the highest degree of chemical resistance is required.
In environments where you find a combination of heat, humidity, dust, abrasives and chemicals, your workers need specialized eyewear that offers protection from both fogging and particulates or chemicals.
Safety eyewear is now available with dual coating technology that delivers scratch- and chemical-resistant hard coating on the exterior surface of the lens and high-performance anti-fog coating on the interior. The wearer is able to keep the interior of the lens free from fogging while protecting the outside from scratches and effects of chemicals.
Military grade protection
It is essential for safety lenses to protect the eyes from high-speed projectiles in the workplace. At a minimum, protective eyewear must meet the ANSI Z87.1 industrial standard for eye and face protection. Product components will be marked with the manufacturer's logo and with “Z87” indicating compliance. Protectors offering high impact protection will contain lenses marked “Z87+”.
Companies that need additional assurance and protection from impact should consider safety eyewear products that provide a higher level of impact protection than required by ANSI Z87.1.
Look for eyewear that has been tested to pass the U.S. Military's MIL V0 ballistic test for impact, requiring that certified products withstand the impact of shrapnel-simulating projectiles moving at the rate of 650 feet per second. This is the equivalent of impact energies seven times higher than the ANSI high impact test.
Specialized tints can be used to solve specific lighting challenges. For example, when intense yellow or sodium vapor lighting is present, a light blue lens filter can be used to overcome the effects. Vermilion â€” or pink-colored lenses â€” can reduce glare from fluorescent and halogen lighting and will also increase contrast for inspection processes.
For typical indoor work, or certainly in a dimly lit work area, clear lenses would be recommended. Outdoor conditions can jeopardize safety through visibility-compromising glare, making the best lens choice a sunglass tint. But if the worker needs to go frequently from indoors to outdoors, a light mirror-coated lens that offers good light transmission while protecting against glare when outdoors is a good choice.
Comfort & styling
There is one more aspect of eye protection that is essential: if it’s not comfortable and doesn’t look good, it won’t be worn. Eyewear that is strictly functional is not enough; fashion, style, and comfort are a must for safety eyewear that protects against hazards, can be worn for hours on end without fatigue, and looks good on the wearer.
In the end, workers must be provided with eyewear that protects, provides visual clarity, and increases productivity. Ensuring compliance, fit, comfort, and style are critical. Each year, the world’s evolving technologies create new work environments where products that do just that are absolutely essential; and new product development teams are working constantly to provide the solutions.