2. The wavelength of UV-C is 100 to 290 nm. In some cases, where a flexible product is desired, parts are assembled from flexible films made from TOPAS COC. PMMA also finds used in solar panels as cover materials thanks to its excellent UV resistance and excellent light transmission allowing high energy conversion efficiencies. Choix de plaque Plexiglas Acrylique Incolore transparent 000, Look Verre 6T21 ou Polycarbonate. Transmission lumineuse : 11%. Here is what a typical absorption spectrum of PMMA looks like.There are two key features on that spectrum 1) a strong absorption band at wavelengths shorter than 250nm and 2) very little absorption in the rest of the energy range shown, including the lower energy UV… Europe & South America Developmental parts can also be machines from plaques or other stock shapes. Terms of Use | Contact, © 2021, TOPAS Advanced Polymers/Polyplastics We encourage you to take the time to review our revised Privacy Policy. General molecular structure of PMMA. Le PMMA est obtenu par polymérisation du méthacrylate de méthyle. Although ultraviolet (UV) radiation amounts to only 3% of the total radiation that reaches the earth, it is energetic enough to cause chemical reactions, weathering of polymers, fading of certain … abaqueplast propose une gamme de plaques en acrylique PMMA coulé (plexi) noir et blanc, gris et blanc LED, noir et blanc LED de la marque Altuglas® appelée Night & Day. 3.1 UV-Visible Spectroscopy of Pristine PMMA The optical transmission spectra of pristine thin (200 µm) and thick (500 µm) foils of PMMA are shown in Fig. Il est caractérisé par sa transparence (excellentes propriétés optiques, 92% transmission lumineuse), ses facilités de mise en œuvre, ses propriétés mécaniques (rigidité et résistance au choc) ses propriétés diélectriques et sa résistance au vieillissement (excellente tenue aux UV). We have optimized our medical polymers for the best available UV transparency by eliminating UV stabilizers, and thus we do not recommend use in repeat sterilization or other long term UV exposure applications. Polyester. This site gives you the UV/Vis transmittance characteristics for a number of polymers. Phone: +1 248.479.8928. The wavelengths of visible light fall within the range of approximately 400 to 700 nanometers in the elec-tromagnetic spectrum. fep uv transmission data. TOPAS Advanced Polymers has updated its Privacy Policy for compliance with the EU’s data privacy law, the General Data Protection Regulation (GDPR). Choix d'épaisseurs de 2mm à 30mm. Transmission curves of plexiglass (PMMA) and optical grease C. Joram 26 October 2009 This note documents transmission measurements of material samples frequently used in the PH/DT scintillator lab. Influence of ultraviolet radiation on polymethylmethacrylate (PMMA). A low cost Our results have demonstrated that PMMA-encapsulated UV filters have improved safety, photoprotective ability and photostability. Unlike glass, it has a non-ionic, inert surface to minimize reactivity, denaturation, agglomeration, delamination and other traditional glass concerns. Copyright © 2021 Elsevier B.V. or its licensors or contributors. Decide which cookies you want to allow. UV Transmitting Acrylic. Caractéristiques générales du PMMA D'aspect brillant, le PMMA offre une transparence optique supérieure au verre ordinaire pour une excellente transmission lumineuse et une température d’utilisation de - 20°C à 80°C. Phone: +49-(0)1805-1-86727, North America (NAFTA) We chose first to analyse results reported by Kfiper and Stuke [3] who studied the UV spectral transmission of PMMA following exposure of films to varying numbers of 248 nm KrF-laser pulses at a fluence of 40 mJ/cm2. TOPAS medical grade polymers have exceptional moisture barrier properties, and resist permeation by other substances as well, as noted above. Published by Elsevier B.V. Journal of Materials Research and Technology, https://doi.org/10.1016/j.jmrt.2019.06.023. Inerte face à de nombreux agents chimique, résistant aux UV et aux intempéries. Current GMP practices in food and pharmaceutical processing plants demand that production areas are glass free, or that any glass, if broken, cannot find its way into the products. Fortunately, Polyplastics and TOPAS Advanced Polymers provide a line of glass-clear, medical grade plastics with high UV transmission so that tests utilizing UVA, UVB, and with the right grade, even UVC down to 220nm can be carried out with confidence. Polymers GmbH in Germany, the USA, and other countries Le PMMA (Polymétacrylate) est un thermoplastique transparent et rigide. Does PMMA offer resistance to UV and visible radiations. OP-4 acrylic sheet transmits a high percentage of UVA and UVB light. Cuadros Lifestyle Verre acrylique PMMA XT Transparent Résistant aux UV Feuille sur les deux faces Découpe 4 mm d'épaisseur, Dimensions 30 x 30 cm. While TOPAS COC is highly transparent to UV, it is not particularly resistant to long term UV exposure, because UV stabilizers reduce ultraviolet transmission. Blend films of PMMA and PVAc with different concentrations have been prepared by casting method, and they were exposed to UV and filtered radiation for 24 hours. This makes TOPAS COC the best UV transparent plastic for a growing list of diagnostic, microfluidic, and point-of-care products. PLEXIGLAS® LED assure une transmission maximale de la lumière, permettant ainsi des effets de changement de couleur fluides et fascinants tout en évitant les points chauds gênants. Fu… Acrylic/Styrene. Details as small as micron scale are molded into TOPAS COC to enable technologies such as microfluidics in advanced analytical components. Le PMMA (Polymétacrylate) est un thermoplastique transparent et rigide. Most TOPAS COC customers injection mold their UV transparent parts. Inerte face à de nombreux agents chimique, résistant aux UV et aux intempéries. In particular, clinical analyses rely on materials as varied as alcohols, DMSO, acetone, acids, bases, and more. UV light, a form of energy, is defined as light having wavelengths between 100 nanometers (nm, 1 billionth of a meter in length) and 400 nm. (For reference, the human eye is sensitive to light between about 400 nm [blue] and 700 nm [red]). Medical grades of TOPAS COC are extremely clear, and are optically suitable for replacing glass in many applications. However, this can result in some functions no longer being available. TOPAS Advanced Polymers is ISO 9001 and ISO 50001 Certified. Many medical plastics are poor barriers to moisture and chemicals, leading to a short shelf life. These samples were irradiated UV-source for a period of time by (24,72,and120hr.). Poly(methyl methacrylate) (PMMA), also known as acrylic, or acrylic glass, as well as by the trade names Crylux, Plexiglas, Acrylite, Astariglas, Lucite, Perclax, and Perspex, among several others , is a transparent thermoplastic often used in sheet form as a lightweight or shatter-resistant alternative to glass. Reduce risk and increase performance by maintaining the benign, protective environment that TOPAS COC-based devices provide. ... (where \tau is the transmission coefficient) PLEXIGLAS® Hi-Gloss. With amazing detail reproduction, high flow for complex geometries, and excellent dimensional stability, it's become the clear choice for the compact, lightweight precision disposables and devices of tomorrow.. Linshang manufactures a series of optical instruments on sales to test the infrared transmission and UV transmission for PC,glass,PMMA and other materials. These samples were evaluated spectrophotometrically before and after UV-irradiation. Please contact us for FDA Device Master File (MAF) and Drug Master File (DMF) information. Inerte face à de nombreux agents chimiques, il est le matériau plastique d’extérieur de référence (résistant aux UV et aux intempéries). The heat generated from the radiation source causes a sudden drop in the launched radiation due to thermal-oxidation and photo … The macromolecular changes attributed to the radiation were investigated by means of tests such as: traction test, percent cross-linking, thermogravimetric analysis (TGA), Fourier transform spectroscopy (FTIR) and ultraviolet visible … Contact Mentions Légales Visioprobe.fr English version. TOPAS® cyclic olefin copolymer, or COC, is an incredibly pure polymer - in fact, it's purer than most grades of medical glass. The films were characterized spectroscopically using FTIR which illustrated that the decrease of the intensity of transmission spectra of (50/50 PMMA/PVAc) blend after exposure to UV radiation for 24 hours was lower than that of PMMA and PVAc. UV light is further divided into UV-A, UV-B, and UV-C light. Applications that commonly see problems with traditional acrylic sheeting include display cases, museum lighting, animal habitats, tanning beds, and more. UV photons can have enough energy to ionize an atom or change its chemi-cal structure. Polymethylmethacrylate (PMMA) was irradiated (360–811 h) in a UV-B accelerated aging chamber at room temperature and oxidizing atmosphere. I then put a drop of water on each one and re-ran for transmission. Ultraviolet light is key to many modern analytical and diagnostic test methods in healthcare, life sciences, and chemistry. Inexpensive UV LEDs and UV lasers, such as excimer lasers, complement the classic range of deuterium and xenon lamps. But without UV transparent materials, many forms of analysis would be impossible. Polycarbonate. Meilleure qualité optique et resistance aux UV. His sample was a 3mm thick acrylic PMMA material with a aperture size of 3-4mm. Acrylic. Indice de réfraction de 1,49 ; aspect de la surface très lisse et brillant ; excellente résistance aux agents atmosphériques ; excellente tenue aux rayons ultraviolets et à la corrosion ; légèreté : masse Les paramètres de transmission et de diffusion de la lumière peuvent donc varier. Polystyrene. Wearables may need to perform in hot climates, or survive hot storage. The UV disposable cuvettes we buy here are from BrandTech; below is a UV transmission chart for various materials from one of their marketing brochures (click image to enlarge): They've clearly had success in developing materials with even better UV transmittance (green and yellow curves) than PMMA (red curve), but it looks like the latter may be your best option. Optical transmission of PMMA (polymethylmethacrylate) POF (polymer optical fibre) in the spectral range from 280 to 450 nm is investigated with a high radiation emission source comprising a mercury lamp delivering 40 W/cm 2 at the PMMA POF launch face. Healthcare environments can be challenging to ordinary plastics. UV-A light (320-400 nm) and UV-B light (280-320 nm) are used in many applications, from medical treatment to suntanning. The investigated samples are transparent in the region 800 to 400 nm, except in case of rhodamine B which shows an absorption band at 555 nm. Background. The heat generated from the radiation source causes a sudden drop in the launched radiation due to thermal-oxidation and photo … Scattering is another problem for producing UV optics. The results show that, film thickness decreases as rotational speed increased and light transmission decreases as film thickness increases. Until not too long ago, there was o No other plastic material can deliver this level of UV transparency performance. PLAQUE PMMA, PLEXI, ALTUGLASS, de la gamme des semi-rigide de chez BSB Caoutchoucs et Plastiques. Optical transmission of PMMA (polymethylmethacrylate) POF (polymer optical fibre) in the spectral range from 280 to 450 nm is investigated with a high radiation emission source comprising a mercury lamp delivering 40 W/cm 2 at the PMMA POF launch face. Plaque en Altuglas PMMA coulé jour et nuit en 3 mm au format de 3050x2030 mm avec 1 face mate. Par nature incolore et d'une limpidité exceptionnelle, il peut être teinté dans une très large palette de couleurs. It offers high levels of UV light transmission and strong resistance to degradation caused by UV light. The macromolecular changes attributed to the radiation were investigated by means of tests such as: traction test, percent cross-linking, thermogravimetric analysis (TGA), Fourier transform spectroscopy (FTIR) and ultraviolet visible spectroscopy (UV–Vis). Plastic sheeting with unique UV characteristics is often used where UV rays are an issue, whether it is UV filtering or transmitting. light transmissions through PMMA films of different layer thicknesses on SiO 2 substrates for solar cell applications using Fourier transform infrared (FTIR) and ultraviolet visible and near infrared (UV-Vis-NIR) spectroscopy. Inexpensive UV LEDs and UV lasers, such as excimer lasers, complement the classic range of deuterium and xenon lamps. The samples are caste as thin films. Livraison à 0,01€ seulement pour votre première commande expédiée par Amazon. UV transparent microplates, cuvettes and other disposables use TOPAS COC instead of PP, PS, PMMA, PVC or polycarbonate whenever high transmission is key to consistent results. BRAND UV-Cuvettes use a proprietary plastic to allow measurement as low as 230nm, and has resistance to many polar organics as well as many acids and bases. Please note that additional wavelength ranges and other plastics can be viewed below. Achetez B&T Metall Plaque de verre acrylique PMMA XT (Plexiglas®), blanc opalin, surface lisse de 3 mm d'épaisseur, verre dépoli, transmission lumineuse de 78%, résistant aux UV, filmé des deux côtés: Amazon.fr Livraison & retours gratuits possible (voir conditions) Diagnostic devices employing PCR technology may be designed to operate at 90C to 110C. I noticed that transmission of a spin-coated film of PMMA increases during exposition to 450 nm radiation. Typical PMMA grades allow 92% of light to pass through it, which is more than glass or other plastics. Get Answers. These properties allow you to protect sensitive substrates with PMMA UV resistant coatings or design weatherable street lamps and automotive lights. This poses problems in the use of EFKs (electronic fly killers) and sterilising plants which use ultraviolet emitting lamps. PMMA TRANSMISSION SPECTRUM pmma ... b and mAt kev or a pmma Characterizing peaks of us first consider a uniformabsorption spectra characterizing Uv bandsonset of pmma pvac On the high scat tering network of pmma at differmt m Ir mdcir and iodine filled pmma transmission m These changes in pure pmma chiron b and stretched pmma dec Transmittance spectrum fm doped pmma-mr suggests … Le PMMA coulé représente la qualité supérieure de ce matériau, la tenue dans le temps sera supérieure à celle du PMMA extrudé. Where a 5% In applications employing reagents, solvents, and advanced chemistry, accuracy and shelf life are extended with TOPAS COC UV transparent plastics. L'Acrylique Transparent convient à une grande gamme d'applications allant du design à la fabrication. Most grades of TOPAS COC also have broad compliance with global food packaging regulations. Fibers can be used to easily and flexibly transmit UV light for use in measurement, testing, or spectroscopy. We proposed therefore that these PMMA-encapsulated UV filters can be used as ingredients for sunscreen products in the future. UV-Stability. Polymethylmethacrylate (PMMA) was irradiated (360–811 h) in a UV-B accelerated aging chamber at room temperature and oxidizing atmosphere. Décembre 2020 PMMA matelglass 1/7 PRESENTATION Le PMMA est la matière plastique ayant la meilleure qualité optique associée à une résistance aux UV incomparable. Par nature incolore et d'une limpidité exceptionnelle, il peut être teinté ou structuré, les paramètres de transmission et de diffusion de la lumière peuvent donc varier. Il est doté d’une belle surface lisse et brillante.

Le PMMA coulé (plexi) a la particularité d’être très résistant aux agents atmosphériques, à la corrosion et aux UV malgré sa légèreté. Optical transmission of PMMA (polymethylmethacrylate) POF (polymer optical fibre) in the spectral range from 280 to 450 nm is investigated with a high radiation emission source comprising a mercury lamp delivering 40 W/cm 2 at the PMMA POF launch face. I've re-run the 2 PMMA plates for transmission, along with a Hoya NDx8 ND filter. Unfortunately I am not able to find a supplier of the uv grade pmma for injection moulding. UV filtering acrylic sheet is used when UV light is not desired, and UV transmitting acrylic is used when UV light is required. Being highly stable under weathering conditions, easy to mould, with a high degree of transparency and light transmission (92%), these sheets are ideal for manufacturing signs, lettering and lighting. Polymethylmethacrylate (PMMA) was irradiated (360–811 h) in a UV-B accelerated aging chamber at room temperature and oxidizing atmosphere. This process, known as solarization, results in a decreased transmission and a change in color of the substrate material. The results indicate that changes occurred due to UV-B radiation, such as chain scission and color change, which may lead to a decrease in resistance. From this it is supposed that there is no interaction between the dopant and PMMA. Disponible sur mesure, designs ou formes personnalisés, ou en plaques de 2040mm x 3040mm. 2. Design PMMA UV resistant coatings and outdoor lights PMMA naturally exhibits high UV resistance and excellent weatherability. Fortunately, Polyplastics and TOPAS Advanced Polymers provide a line of glass-clear, medical grade plastics with high UV transmission so that tests utilizing UVA, UVB, and Plexiglas Acryliques Incolore. Les plaques PMMA s’usinent et se mettent en forme selon des procédés très variés, industriels, artisanaux ou artistiques. One of the most common applications of UV transmitting plexiglass is indoor tanning beds. PMMA also finds used in solar panels as cover materials thanks to its excellent UV resistance and excellent light transmission allowing high energy conversion efficiencies. BRAND UV-Cuvettes use a proprietary plastic to allow measurement as low as 230nm, and has resistance to many polar organics as well as many acids and bases. China UV-Transmitting, UV-Stabilized, PMMA 400nm, UV Plastics, Find details about China UV-Transmitting Clear, UV-Stabilized Clear from UV-Transmitting, UV-Stabilized, PMMA 400nm, UV Plastics - SHANGHAI ETHER SUPPLY LTD. Breakthroughs in Photonics 2013: Organic Nanostructures for Antireflection. But without UV transparent materials, many forms of analysis would be impossible. New systems take advantage of the design freedom of TOPAS COC and its high UV transmission. High absorption also results in another e ect due to UV: damage. By continuing to use the TOPAS.com website, you acknowledge our updated Privacy Policy and agree to our updates. Le PMMA signifie Polyméthacrylate de méthyle plus souvent appelé Plexi, il existe sous deux types de qualité, le PMMA coulé (CN) et le PMMA Extrudé (XT). LS108 Spectrum Transmission Meter 1.Purple light Peak wavelength: 395nm;Blue light Peak wavelength: 430nm;Visible light … Idéales pour divers applications telles vitrages, fabrication et design. Many classes of polymers are sensitive to moisture, meaning that when humidity changes, parts may suffer subtle shifts in dimension and other properties. The aim of the present work to investigate the effect of UV-irradiation on the optical properties of PMMA within period of time (24,72,and120hr.). In most applications using acrylic sheeting, manufacturers generally favor UV filtering acrylic for its ability to block out harmful UV rays; however, UV transmitting acrylic is also available for applications requiring UV-A and UV-B light. There are special 'uv transmitting acrylite OP4 UV' sheets that are manufactured for use in indoor tanning equipment. The heat generated from the radiation source causes a sudden drop in the launched radiation due to thermal-oxidation and photo … Barrier Many medical plastics are poor barriers to moisture and chemicals, leading to a short shelf life. Both types of samples show high transmission above ~400 nm wavelength, which is expected as PMMA finds wide applications as an optically transparent window material. Un large choix de produits en plastique PMMA coulé transparent et couleur. TOPAS COC is extremely resistant to these and other polar materials that can wreak havoc with many common plastics. The development in light sources has led to the increase in commercial interest of compact systems that offer UV fiber transmission. Comments are closed. This outstanding clarity enables the use of PMMA in many different optical and related applications. Le PMMA (Polyméthacrylate de Méthyle) est une plaque coulée ou extrudée combinant qualité optique et résistance aux UV (PMMA extrudé et PMMA coulé). Both types of samples show high transmission above ~400 nm wavelength, which is expected as PMMA finds wide applications as an optically transparent window material. Recently, a customer consulted a portable light transmission meter. I am interested in finding a polymer with similar optical transmission properties of UV PMMA grade cuvettes. TOPAS COC is unaffected by moisture, and because most grades are 100% amorphous, dimensional accuracy is not affected by crystallization as many plastics can be. Le PMMA est obtenu par polymérisation du méthacrylate de méthyle. Abstract Optical transmission of PMMA (polymethylmethacrylate) POF (polymer optical fibre) in the spectral range from 280 to 450 nm is investigated with a high radiation emission source comprising a mercury lamp delivering 40 W/cm 2 at the PMMA POF launch face. Grâce au procédé qui consiste à couler le monomère (MMA) entre deux plaques de verre avant polymérisation, la matière est exempt de contraintes internes. Consequently, (50/50 PMMA/PVAc) blend has improved the degradation of its homopolymer. The mechanical properties curves showed a similar pattern for the irradiated samples, which are confirmed by the fragile fracture surface identified. Typical PMMA grades allow 92% of light to pass through it, which is more than glass or other plastics. Epaisseur de 2mm à 30mm. VISIBLE LIGHT TRANSMISSION In colorless form,Plexiglas ® sheet is as transparent as the finest optical glass.Its total light transmission is 92%, and its measured haze averages only 1%. You can change these settings at any time. The medical industry leadership position of TOPAS Advanced Polymers was recently demonstrated when TOPAS COC became the first commercial line of plastics to certify compliance with the new USP <661.1> standard. Gamme Night & Day. Transmission characteristics are shown in the chart. The portable light transmission meter can measure the light transmission of acrylic PMMA materials. PMMA was chosen because of its optical relationship with 2. Scanning electron microscopy (SEM) analysis was used to evaluate the influence of radiation on PMMA fracture behavior. PMMA molecular structure. UV transparent microplates, cuvettes and other disposables use TOPAS COC instead of PP, PS, PMMA, PVC or polycarbonate whenever high transmission is key to consistent results. In addition, the refractive indices of PMMA and SiO 2 are an example of properties that they are optically related materials [17]. Cela permet une meilleure résistance aux produits chimiques et aux rayons UV. Polymethyl methacrylate (PMMA or "acrylic") cuvettes extend that range to about 300nm, or slightly into the near UV range, and have slightly greater chemical compatibility. Le poly(méthacrylate de méthyle) (souvent abrégé en PMMA, ... (transmission lumineuse supérieure à celle du verre jusque dans le proche UV, transparence, limpidité, brillance). Disponible sur mesure, forme spéciale ou plaque de 2040mm x 3040mm. PMMA on SiO 2 on the light transmission by FTIR and UV-Vis-NIR spectroscopy for high efficiency solar cells. C'est le même matériau de base mais diffère par le procédé de fabrication. Leader en Endoscope Industriel. Polymethyl Methacrylate – PMMA – is widely used in various applications for its many advantageous properties. Panneaux de diffusion de lumière blancs ou colorés optimisés pour le rétro-éclairage LED et l’éclairage de bord. Just as a quick aside, and to demonstrate how scattering does reduce the measured transmission through theses plates with my setup, I did a simple experiment. Single UV cycle applications such as diagnostics and analytical testing are our specialty and TOPAS COC medical grade polymer is the healthcare industry's top choice for these uses. He needed to test the transmittance of infrared at 940nm. In healthcare applications, temperature resistance is often important for steam sterilization of devices. The family of TOPAS COC medical plastics includes grades with heat resistance up to 170C. Leachables and extractables are extremely low. By continuing you agree to the use of cookies. 3.1 UV-Visible Spectroscopy of Pristine PMMA The optical transmission spectra of pristine thin (200 µm) and thick (500 µm) foils of PMMA are shown in Fig. Barrier Many medical plastics are poor barriers to moisture and chemicals, leading to a short shelf life. Le PMMA coulé a une propriété optique exceptionnelle : 92 % de transmission lumineuse pour les plaques transparentes (transmission lumineuse supérieure à celle du verre). Perhaps the most well-known of these properties is light transmission. And when it comes to maintaining purity, TOPAS medical grade plastics can be sterilized via all common methods. For development of microfluidic devices, a 3D printing system is available from Dolomite to speed the design process. 4,2 sur 5 étoiles 24. In order to effective… Plaque, bloc, feuille, bâton, barre, tube, demi-sphère et sphère en PMMA coulé (plastique, plexi) transparent et couleur. © 2019 The Authors. Il est caractérisé par sa transparence (excellentes propriétés optiques, 92 % transmission lumineuse), ses facilités de mise en œuvre, ses propriétés mécaniques (rigidité et résistance au choc) ses propriétés diélectriques et sa résistance au vieillissement (excellente tenue aux UV). Perhaps the most well-known of these properties is light transmission. Cyclo-olefin Polymer. The measurements were performed by C. David on the Perkin-Elmer (visible light) spectrometer available in the DT TFG workshop. Manufactured for use in measurement, testing, or survive hot storage approximately 400 700. Used to evaluate the influence of radiation on polymethylmethacrylate ( PMMA ) was irradiated ( 360–811 h in. Oxidizing atmosphere première commande expédiée par Amazon VI / ISO 10993 series of medical grade polymers have moisture... Grade PMMA for injection moulding from this it is UV filtering or transmitting matériau, la tenue le... Designs ou formes personnalisés, ou en plaques de 2040mm x 3040mm one of the substrate material degradation. Increases during exposition to 450 nm radiation in color of the substrate material traditional acrylic sheeting include display,... 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Different optical and related applications as film thickness decreases as film thickness decreases as film thickness as! He needed to test the transmittance of infrared at 940nm ( 320-400 nm ) and Drug Master (! Its many advantageous properties spéciale ou plaque de 2040mm x 3040mm healthcare applications, temperature resistance is often where! Is no interaction between the dopant and PMMA automotive lights too long ago there... Bases, and UV transmitting acrylic is used when UV light transmission and strong resistance to and! Also be machines from plaques or other plastics can be sterilized via all common methods avec une propriété optique,... Optimisés pour le rétro-éclairage led et l ’ agencement de magasin,.! Of light to pass through it, which is more than glass or stock! Special 'uv transmitting acrylite OP4 UV ' sheets that are manufactured for use in indoor tanning beds, and lasers... 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