UV radiation is commonly used in germicidal lights in hoods and is a component of sunlight. UV radiation will have a serious deleterious effect on most plastics, especially the polyolefins, including polyethylene (low-density polyethylene [LDPE] or high-density polyethylene [HDPE]); polypropylene (PP), and polymethylpentene (PMP); and acrylics. Polystyrene (PS), polycarbonate (PC) and polyethylene terephthalate G copolymer (PETG) can withstand limited UV exposure.

All light is given off at different wavelengths. For example if you see a rainbow, you will notice that the colors are always in a specific order from red all the way to blue. You are able to see each color due to their individual wavelength. These wavelengths are part of the visible portion of the electromagnetic spectrum. UV light is at a wavelength of 254nm (nanometers), and is not visible to the naked eye.

You never want to expose your skin or eyes to the light from a UV system. UV light is non-visible however it can be harmful, similar to the harmful effects of UV light from the sun. UV lamps can actually cause a severe sunburn-like effect if skin is exposed for long periods of time. Always ensure that you are wearing some type of protective glasses (ie. Safety glasses or sunglasses) when working on a UV system and the lamp is exposed.

UV does not kill microorganisms like chlorine does, but instead UV inactivates them. UV light at a specific wavelength of 254 nm is readily absorbed by the genetic material of microorganisms. The DNA strand is coded with a specific sequence of something called base pairs. The sequence of these base pairs codes for certain characteristics. UV light at 254 nm is readily absorbed at the point on the microorganism's DNA strand which codes for reproduction.

Sunlight exposure (exposure to UV light) is your body's main source for Vitamin D - an essential vitamin for bone formation and repair, absorption of calcium and phosphorus and general good health. In many climates, the small amount of sunlight available from November to March makes it impossible to process Vitamin D naturally through outdoor sun exposure.

After more than two decades of field exposure in different climatic conditions, samples collected of EPDM membrane show no evidence of crazing or cracking. As a result of the excellent UV resistance, EPDM membrane can be warranted up to 30 years.

No. That is why, after application of Dr. Fixit Torchshield, all non-foot-traffic areas should be finished with aluminium paint for UV protection

No. You should always paint or cover foam that will be exposed to sunlight. UV rays will cause the foam to discolor and degrade. Touch 'n Seal Black Foam is UV-resistent and does not require painting to maintain it's integrity.

Yes, the formula includes a UV inhibitor. The product was formulated for the New Zealand market where the ozone layer is thin, allowing more UV through than we find here in the northern hemisphere.

Standard CDA cases are slightly UV-resistant. In additiona, they will protect your items by sealing them in hard acrylic to keep them in the same condition as when they were graded. They will not be touched by human hands and the hard acrylic prevents it from sustaining any additional creases, bubble dings, or other damage. In addition, 99% UV-Resistant acrylic cases are available for additional light protection.

It is essential that you change your UV lamp annually. The ability of the lamp to emit UV light decreases over time. Remember - UV light is invisible! Even though the lamp is still glowing after one year, there might not be enough UV light reaching your water to be effective.

Absolutely. There is a growing body of well-conducted, validated scientific research demonstrating that the production of the activated form of vitamin D is one of the most effective ways the body controls abnormal cell growth. Moderate exposure to sunlight is the only way for the body to manufacture the vitamin D necessary for producing activated vitamin D.

For information on the UV properties of the euro banknotes, see the guidelines on how to identify counterfeit euro banknotes.

Most of the decals are not resistant to UV light. If UV resistance is required for the decal, you must state out this condition when you make the enquiry. The material and the ink for the decal will be different. And the cost of the decal will not be the same.

Most of the stickers are not resistant to UV light. If UV resistance is required for the sticker, you must state out this condition when you make the enquiry. The material and the ink for the sticker will be different. And the cost of the sticker will not be the same.

U.V. acts as a strong catalyst for the oxidations process which breaks down the polymer chains, leading weakness in the pipes & fittings and to loss of hydrostatic strength." Above effect is very much possible with materials like PP & PE. But for PVC main process is dehydrochlorination not Oxidation. This dehydrochlorination does not break down the polymer chains to any significant extent after outdoor exposure, being mainly limited to a surface discoloration effect only.

It is a fact that prolonged exposure to ultraviolet light will fade colours. However, this requires considerable cumulative amounts of UV light. Because a home UVB unit is used relatively infrequently, (as compared to exterior paint exposed to daily sunlight), our practical experience is that colour fading is not an issue. If it occurs, it is barely perceptible. The only possible exception to this is that fine art should be protected.