It is lighter than glass and naturally absorbs UV radiation (<350 nm), making it ideal for eyeglass applications. CR-39 (Allyl Diglycol Carbonate or ADC)ĬR-39 is most commonly used in eyeglass lenses due to its high optical clarity and scratch resistance. PEEK plastics are used as buffer materials in optical fibers, automobile parts, and aluminum replacements in aerospace applications. These makes them suited for highly demanding industrial applications. Additionally, PEEK is a flame retardant and does not easily dissolve in water or common organic solvents. They melt at around 340 oC and have a high tensile strength and creep resistance. PEEK plastics are commonly used in engineering applications that require high-temperature and mechanical stability. The ability to realize transparent conducting surfaces is essential for touch screens in smartphones, tablets and, more recently, flexible displays. Conductors such as Indium Tin Oxide (ITO) and silver nanoparticles can be coated on PET substrates. PET substrates have low haze, high transparency, and high optically smoothness, that makes them ideal for applications in touch panels and solar cells. PET substrates are highly transparent with a transmission of greater than 90% across the visible spectrum and a refractive index of 1.57. PET is used to make a range of products from the ubiquitous water bottles, polyester fabric to thin film solar cells. Polyethylene Terephthalate (PET)Ĭommonly known as PET, this plastic is one of the most versatile and widely used materials.
#PEEK MATERIAL PROPERTIES EVAPORATE PC#
Additionally, multilayer coatings can be deposited on PC substrates for optical filter applications. CDs and DVDs generally have reflective metal coatings of gold or aluminum over the PC substrates. This makes them suitable as substrate materials for optical filters, mirrors and reflectors and CDs/DVDs where high transparency is required with track spacings in the range of 0.75-1.6 microns. Optical components with PCs can be produced with high dimensional accuracy and low defects. Although, silicones are more popular today due to the added advantage of flexibility. Ophthalmologyĭue to its affinity to human tissue and excellent stability, PMMA was the first material to be used in intraocular lens implants. Due to its light weight, PMMA headlights, taillights, indicators, and other parts in automobiles are extremely desirable and contribute towards the overall efficiency of the system.
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PMMA is even used in infrastructure applications such as windows in aircraft, roof panels, aquariums, and automobile headlights. Some notable applications of PMMA are: Glass AlternativeĪs compared to glass, PMMA does not shatter, which makes it a safer choice in many applications. These properties make it an excellent replacement for glass as an optical material. PMMA absorbs UV light with wavelengths shorter than 400 nm, and IR wavelengths higher than 2800 nm. PMMA has a refractive index of 1.49 at 589.3 nm and a 3 mm thick sheet transmits 92% of light in the visible spectrum. It is also known as plexiglass or acrylic glass. In this class of plastics, by far the most widely used plastic is PMMA or Poly Methyl Methacrylate. Plastics in Optical Applications Acrylics Such plastics are well suited as substrates in the manufacture of a range of optical components like lenses, optical fibers, gratings, etc. Within that wide range of plastic materials, there is a special category of plastics that exhibits excellent optical properties such as high-transmission and refractive index comparable to float glass. They are extensively used as packaging materials, and functional or protective components in medical equipment, construction tubing, contact lenses, fabrics etc. From a chemical perspective, plastics are essentially polymers of hydrocarbons. Plastics have several advantages over glasses and ceramics, and in many recent applications have served as a formidable replacement for traditional optical materials. Although glass has been the traditional choice for optical components, the advent of plastics transformed and expanded their application potential in modern optics.
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