Glass: Glass offers the best optical clarity, meaning that there is virtually no distortion in glass lenses. This is why it is the material of choice in manufacturers such as Ray-Ban, Revo, Vuarnet, and Serengeti. However, glass is the least impact resistant of all of the material, and may shatter upon impact. Shattering means that the lens will split into small pieces which can easily enter the eye and cause permanent eye injuries or even blindness.

The "standard plastic" lenses are often called "Hard Resin", "CR-39 plastic", or just quot;plastic" lenses. CR-39® is actually a PPG Industries registered trade name for a DADC (diallyl diglycol carbonate) polymer that was introduced in 1941. The "CR" stands for Columbia Resin and CR-39 was the 39th batch or formula made by Columbia Laboratories in Ohio. See similar questions...

CR-39 refers to the type of plastic that is used to make prescription lenses. This is optical plastic and provides very little distortion .It is more lightweight and thinner than glass making it comfortable to wear. It is more impact resistant than glass, but may still break and shatter upon impact. Therefore, it is not recommended for active sports and motorcycling. It is more scratch resistant than polycarbonate, but will scratch if not properly taken care of. See similar questions...

All of our lenses are made of plastic as they are lighter and more popular. Most spectacles are currently made with plastic lenses. If you would like glass please email us and we will advise you of costs etc See similar questions...

Plastic lenses are lighter and have 3 x the impact resistance of glass while glass lenses are thinner. No, the price on the frame relates only to the frame. Lens prices vary depending on the material and design of the lenses required. Ask your optometrist or dispenser to advise on the most suitable lens type for your prescription. See similar questions...

Solexx greenhouses are made with polyethylene. Polyethylene is much more flexible and is easy to cut to any size. Polycarbonate panels tend to be thicker, but have about the same insulation factor as polyethylene. Both materials diffuse light, but polycarbonate diffuses less (because it is more transparent), making the greenhouses much hotter in the summer. Polyethylene is very easy to clean and will not scratch like polycarbonate. See similar questions...

Polycarbonate lens material is so tough that you can hit it with a hammer and it won't shatter. Ordinary polarizing lenses are made out of plastic (CR-39), and are not shatter resistant. In addition, polycarbonate lenses absorb harmful UV radiations. See similar questions...

People generally report that glass provides about 10% better performance than plastic. And there is reason to believe that under windy conditions, glass is preferred since it doesn't flap in the wind and dissipate heat from the cooker. Plastic, however, is often recommended since is much less fragile and easier to transport and works plenty well. One excellent, easily-obtained plastic film is oven cooking bags. These are for sale in grocery stores and cost less than US$1 per bag. See similar questions...

Most safety glass lenses are today made from Polycarbonate, and this is a very tough material. The impact resistance of a Polycarbonate lens is approximately ten times higher that of a safety glass lens made from hardened glass. Both these lens types (has the potential to) meet the requirements of the Eye and Face Protection Standard, ANSI Z87. If you want to see an example of how tough a Polycarbonate lens is, click on this link: www.elevx.com/how-strong-is-polycarbonate.htm See similar questions...

Polycarbonate lenses are more impact resistant and lighter than regular plastic material. It is the preferred lens for minors. A scratch resistant lens does make a lens scratch resistant. But, that does not make it scratch proof. However, if you do purchase this coating, we warranty the lenses with a one time, one year replacement. See similar questions...

We do not recommend this nor do we install film on it. However below is Llumar ? documentation regarding this question we are asked often which may be beneficial to you in answering the question you have been searching for: The answer is somewhat complex. Generally speaking, the simple and flat answer (as of January 2000) is "NO," though research is always on-going and new specialty products more compatible with plastic sheeting are always a future possibility. See similar questions...

Acrylic is sold under the trade name Plexiglass? and polycarbonate is sold under the trade name Tuffak? or Makrolon?. The plastics manufacturer we work says that acrylic is more weatherable than polycarbonate, is slightly more scratch resistant, and is more economical than polycarbonate. Polycarbonate has greater impact resistance than acrylic, and is more expensive. See similar questions...

Better food safety for consumers, because utensils are not intended to go inside the bottle, as happens with dressings in jars. Plastic is better for transportation because of fewer broken bottles and less weight per bottle which helps us load more bottles onto each truck and thereby reduce the number of trucks on the roads See similar questions...

Our new bottles are better for you, your kids and the environment because they are lightweight, shatterproof and easily recyclable. We use only the best quality clear plastic bottles because they're easier and more efficient to recycle than glass. They're also the most widely recycled beverage container, and they're recycled to make such useful items as polar fleece and fiber-fill for jackets. See similar questions...

a safety precaution, we supply only plastic lenses. They will safeguard your eyesight much better than wearing potentially dangerous glass lenses so close to your eyes. See similar questions...

No. Everything is polymer based. The coatings are designed for plastics which have much different processing requirements than glass elements. See similar questions...

Polycarbonate is the other material commonly used in domed skylights. Polycarbonate is used in applications where impact resistance is a requirement. It is the material used in our Miami-Dade Approved Hurricane Impact Skylights. It is even popular in areas that may be prone to Hail Damage. Polycarbonate can be formed just as easily as acrylic. See similar questions...

No. You can put anything that you call a bottle or can into the same "Bottles and Cans" recycling bin. We are so clever with those names... See similar questions...

You can choose in most cases. If you are concerned with originality then you should select the appropriate top. If cost is a factor the plastic windows are less expensive and also cost less to ship. Glass is considered maintenance free and should last as long as your top. Plastic will deteriorate and how long it will last is dependent on many factors such as where it is stored, how much sun it is in, weather, etc. See similar questions...