29.04.2015
A significant barrier to technical acceptance by solar developers and manufacturers is the question of durability under severe outdoor conditions. To test for weatherability, reflector samples were subjected to controlled conditions more extreme than experienced in actual outdoor environments, such as high doses of UV light, high humidity, and high temperatures. Contact cleaning methods commonly used for CSP systems can scratch the surface of polymer reflectors and thereby reduce specular reflectance.
Samples of ReflecTechPLUS mirror film were subjected to all of the same accelerated exposure conditions as the uncoated film and demonstrated equally good results.
Recently, Christopher, a thirteen-year-old reader from Michigan wanted to know if the blue light that dentists use to cure fillings and sealants can hurt your teeth when used for a long period of time. Christopher wanted to know if the blue light can burn, irradiate or otherwise hurt someone’s teeth when used longer than it should be.
The blue dental curing light emits light at a wavelength of around 450 to 490 nm, a blue light.  You can read more about the visible light spectrum here.
The very first light-activated filling materials used ultraviolet light.  Fortunately, today dentists only use materials that are cured by visible light as the use of UV cured materials has pretty much died out due to the dangers posed by ultraviolet light. A good test to see if the curing light is too hot is to hold your finger 2-3 mm away from the curing light for 20 seconds.  If your finger gets too hot, then the curing light could do damage to the teeth.
One of the major dangers of the blue dental curing light is that it can hurt your eyes!  When we were learning how to do white fillings, our professors always advised us to never look at the blue light. Although there is minimal potential for radiation damage to surrounding soft tissue inadvertently exposed to visible light, caution should be used to prevent retinal damage to the eyes.  Because of the high intensity of the light, the operator should not look directly at the tip or the reflected light from the teeth.
The orange filter that you can see on the curing light above filters out the visible light, allowing the dentist or assistant to see what they are doing without looking directly at the light. The dental assistant probably just wanted to make sure that the sealant was hardened all the way, and didn’t want to leave any room for doubt.
Do you have any questions or comments about the blue dental curing light used in dentistry?  If so, feel free to leave them in the comments section below.  Thanks for reading! Hi Tom, I had a root canal done today, the dentist assistant accidentally shined the blue light in my eyes ..is it dangerous?
Yes they do make some protective glasses the same orange color as that guard if you are that worried about small amounts of exposure.
I’m a dental assistant and I find this article very useful for those that are not familiar with dentistry. The blue light causes an initiating agent in the composite resin we use in teeth to start a polimerization reaction to harden the composite.
All of my teeth are sensitive and I cannot even have room temperature water without it causing discomfort.
Went to periodontist he said perio disease upper right holes in teeth cap from 2009 has hole. Hi again, my whole face is swollen and my glands on the sides of my neck under jaw are the size of golf balls according to a dentist I went to. All food tastes terrible, sensitive on every tooth, sPices or pepper feels gritty and I can it swallow. No, all teeth cracked and Hygenist said stains on back of 4 front teeth is the sentinel exposed. I had this technique carried out on one of my molars last year, recently I have been experiencing pain and extreme sensitivity in that particular tooth, also the pain radiates to my lower jaw and eye socket could this treatment have side effects later on. 3 adet Dx7 Epson® bask? kafas? sayesinde yuksek h?z, 2880 dpi bask?ya ulasma ve paralel bask? teknolojisi.
USB 2.9 Bundled, Phutuprint, Shiraz RIP ile yuksek data iletisimi ile kaliteli bask? elde etmenizi saglar. Traditional medium-pressure mercury (Hg) lamps produce a wide spectrum of radiation, including significant emissions in the ultraviolet region, specifically UVC, UVB, UVA and UVV.
These traditional Hg lamps yield 70-75% radiation in non-useful wavelengths, most notably high-energy infrared light that produces significant heat.
The science of producing a suitably high flux of intense UV photons with light-emitting diodes has made remarkable progress in the past 10 years. To test this principle, a simple clear formulation (50% epoxy acrylate, 50% IBOA) was blended, and photoinitiators were added at percentage levels. Type 2 photoinitiators and EMK (Ethyl Micheler’s Ketone) were not tested individually in this screen.


Note: Although MBF gave a poor result by itself, it does have excellent solvency for other PIs and possibly some synergy in cure response.
A concentration curve up to 15% photoinitiator was created for BDMM in the same clear formula and tested for cure as a function of line speed (dose). The addition of Type II initiators could be considered to reduce oxygen inhibition, but, again, yellowing can be quite severe. The master batch formula was diluted with 60 pbw DPGDA and tested with several photoinitiator packages to achieve reasonable cure. Our September issue focuses on sustainable solutions, specialty chemicals, architectural coatings and the latest pigment technology.
High-output CC Series HVAC UV light fixtures are designed specifically as HVAC air cleaner systems. To learn more about CC Series HVAC UV light fixtures,including technical specifications, and independent IES Test results, please visit our technical library where you can download and print literature. Prolonged, direct exposure to UVC light can cause temporary skin redness and eye irritation, but does not cause skin cancer or cataracts. International Shipping - items may be subject to customs processing depending on the item's declared value. Your country's customs office can offer more details, or visit eBay's page on international trade. Estimated delivery dates - opens in a new window or tab include seller's handling time, origin ZIP Code, destination ZIP Code and time of acceptance and will depend on shipping service selected and receipt of cleared payment - opens in a new window or tab. This item will be shipped through the Global Shipping Program and includes international tracking.
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This is a private listing and your identity will not be disclosed to anyone except the seller. For any outdoor application to achieve product lifetime goals, the reflective technology must be weatherable – stable against UV light, resistant to the effects of moisture and temperature changes, and durable under high wind events.
The ReflecTechPLUS samples also exhibited outstanding initial abrasion resistance and adhesion, properties that were retained after exposure to various accelerated stress conditions including condensation cycling, thermal cycling, water immersion, and exposure to concentrated UV light. I ask because recently I’ve been having major work done and even though the assistant is being careful about where the light shines it still ends up blinding me because all the work is being done on my front teeth, upper and lower and the intensity is much worse while the work is being done on the upper teeth.
I am willing to try it as I’ve changed a few things in that industry already, the blue light is very intriguing to me. The need to keep typical Hg lamps cool requires voluminous airflow, and, thus, additional energy. Also note that the 395 nm lamp provides much greater peak irradiance than the traditional Hg lamp, as well. A difference could be seen between 4 and 8 mm to the substrate, but a longer distance showed no further decrease in reactivity. Coatings were tested between 6 and 80 micron thicknesses and demonstrated little difference in cure.
Type II initiators show very little reaction at the LED wavelengths tested, and ITX contributes substantially to yellowing.
However, with the level of pigment required to achieve commercial print densities, the amount of photoinitiator required was near 20%.


Screen inks and other similar low-pigmented, thick-film and slow-speed decorative systems could be cured adequately, similar to inkjet. American Ultraviolet systems are designed with safety in mind and, when properly installed by a professional contractor, do not allow exposure to UV irradiation and allow for safe operation and maintenance. If you'd like to get the additional items you've selected to qualify for this offer, close this window and add these items to your cart. Contact the seller- opens in a new window or tab and request a shipping method to your location. You have read and agree to the Global Shipping Program terms and conditions - opens in a new window or tab. Import charges previously quoted are subject to change if you increase you maximum bid amount. This collaborative research has recently produced an abrasion resistant coating (ARC) for application to polymer based mirror film. The desired ARC properties are high transparency and optical clarity, weatherability, abrasion resistance, strong adhesion to the base mirror film substrate, compatibility with high volume roll-to-roll production, and low material and manufacturing costs. The ReflecTechPLUS samples withstood abrasion testing of over 50,000 back-and-forth scrub brush cycles, simulating more than 50 years of weekly brush cleanings. Is there anything that can be done to protect the patients eyes while these lights are being used to cure the dental materials? I have looked at it by accident a couple of times and I would compare it to looking directly at the sun. The low-power systems are typically fitted to inkjet scanning applications, and the high-power systems are slowly finding their way into traditional high-speed printing equipment.
As much of our customer base is focused on inks and coatings, significant focus on pigmented systems was included in this first study.
Considering the band overlap potential, it should be possible to find one or more photoinitiators (or, more likely, a combination of photoinitiators) that can provide sufficient free radical flux to initiate an efficient polymerization, even in pigmented systems.
One explanation might be that the high levels of photoinitiator required to achieve sufficient cure combined with the greater penetration of the 395 nm wavelength light overcomes surface cure inhibition common in traditional systems.
Although not specifically tested in this study, low-film-weight opaque whites would likely suffer from insufficient cure without a boost from Type II photoinitiator, but yellowing with its inclusion. These individual HVAC UV air purifiers can be mounted to plenum walls, or multiple fixtures can mount to frame assemblies that span supply ducts or cooling coils. If you reside in an EU member state besides UK, import VAT on this purchase is not recoverable.
The ARC was developed to address the need for reflectors that are low in cost, high in performance and capable of withstanding the mechanical contact cleaning methods sometimes used in the CSP environment. Visual effects of the abrasion testing are nearly imperceptible and measured specular reflectance is virtually unchanged3. So, in order to get sufficient curing, web processing speeds are relatively low (under 50 fpm). Do they make glasses that a patient can wear while this procedure is bing preformed to protect their eyes like the dentists and his assistants are by the orange filter?
BDMM and PMP are slightly better than TPO but their high yellowing after cure would normally rule them out as suitable photoinitiators for clearcoats.
Going forward, ReflecTech intends to pursue methods in which web speeds can be increased in order to reduce processing costs and reduce thermal loading of the mirror film during processing. ReflecTech is interested in working with companies that offer capabilities and solutions to increase line speeds and increase UV dosages. Some curing light are set on periods of 10 seconds and some materials require more or less curing time thats why we have to keep pressing the button a couple of times. It that work was done properly no cleaning before a 3hour torture treatment where 1 tooth cut off and a cerac crown glued on top mercury filling was left underneath crown.



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Comments Uv curing systems

  1. kommersant
    Such tubes often have a long thin metal nozzle for few ways.
  2. Leyla_666
    ??Corona discharge,??where uv curing systems damaged insulation on electrical equipment like other adhesive agents, if you get cleaning solution.