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.

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.

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

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.

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.

Polycarbonate (PC) is a high-impact shatter resistant plastic material that does not retain odor, and can withstand extreme temperatures. It is dishwasher safe plastic material, which is approved by the FDA of the United States. Our bottles are made out of original Polycarbonate materials, the best thermoplastic out there. Polycarbonate plastic materials are made by only a handful of international companies such as General Electric Company and Bayer.

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.

Polycarbonate lenses are plastic lenses that are ten times more impact resistant than other plastics making them very suitable for contact sports or butter fingers! They offer UV protection and stop 99.9% of rays from the sun, fluorescent lights and computer screens. They come with a scratch resistant coating, are thinner than standard lens and therefore more comfortable to wear.

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.

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

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.

A No problem. Unlike some roofs, Ultraframe roofs are structurally capable of carrying the additional weight of glass sealed units. You can choose between clear or tinted glass and we also offer a performance glass option that will help to reduce heat and solor gain. Email us with the details of the conservatory and we will be happy to provide a specific quotation.

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.

The only difference in these products is the thickness. The flexible supports (aluminum or plastic) are made a little thinner (0.2mm vs 0.25 on glass). This does not affect the performance at all. The advantage of these layers is that they can be cut either to allow using only what is needed, or after development they allow the spots to be cut from the rest of the plate. This can be done with scissors or a razor blade.

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

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.

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.