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Polycarbonate is commonly used in eye protection, as well as in other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Polycarbonate lenses also protect the eye from UV light.
Recycling codes on products. Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process.The presence on an item of a recycling code, a chasing arrows logo, or a resin code, is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.
A polycarbonate is an oxocarbon dianion consisting of a chain of carbonate units, where successive carbonyl groups are directly linked to each other by shared additional oxygen atoms. That is, they are the conjugate bases of polycarbonic acids , the conceptual anhydrides of carbonic acid , or polymers of carbon dioxide .
In the absence of activating light, the lenses return to their clear state. Photochromic lenses may be made of polycarbonate, or another plastic. Glass lenses use visible light to darken. They are principally used in glasses that are dark in bright sunlight, but clear, or more rarely, lightly tinted in low ambient light conditions. They darken ...
Researchers from The Institute of Cancer Research in London have developed a new test that can predict colorectal cancer risk in people with IBD with more than 90% accuracy.
Seasonal flu activity is elevated across most of the country, according to the latest reports from the Centers for Disease Control and Prevention, and experts say this is expected to continue for ...
Plastic recycling is low in the waste hierarchy, meaning that reduction and reuse are more favourable and long-term solutions for sustainability. It has been advocated since the early 1970s, [ 116 ] but due to economic and technical challenges, did not impact the management of plastic waste to any significant extent until the late 1980s.
Bloated food packaging doesn’t always mean the food inside is dangerous to eat, says Zhang. If you live in a high-altitude area, such as Denver, a food package may swell because the air pressure ...
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