ADC Cast Optical Sheet
The continual advancement in resolution, reliability and performance of electronic display technologies requires display readout windows and optical filters that do not compromise readability or contrast of the information displayed. The "see-through" problem in the past has been solved by using various transparent materials such as glass, acrylic, cellulose acetate butyrate and polycarbonate. These materials all have some disadvantages, such as, impact resistance, chemical resistance, scratch resistance, clarity, weight, yellowness upon aging, workability, consistent antiglare finishes, crazing and custom colors.
Optical
Polymers International supplies optical sheet cast from a family of
thermosetting polymeric blends based on ADC, Allyl Diglycol Carbonate monomer.
CastADCsheet has unique optical and mechanical properties superior to other transparent
materials without any of their disadvantages. ADC, sometimes called CR-39®, was
developed as a substitute for glass and is often called organic glass. It has
almost the same refractive index, chemical resistance and similar mechanical
properties as glass. ADC monomer has been used for many years in the
manufacture of ophthalmic lenses. More than 80% of ophthalmic plastic
lenses are made of ADC.
Optical Polymer's ADC sheet is cast from a family of proprietary allyl diglycol carbonate formulations that produce optical sheet with superior properties for all display applications. Three types of sheet are available: standard, hi-temperature resistant and hi-impact resistant. ADC is available with three "cast in" matte surface finishes for superior glare reduction.
Display readout windows and optical filters are custom fabricated from ADC to meet the most demanding applications and are available in almost any thickness, shape or color. ADC is accurately cut to size with state of the art precision laser cutting technology.
®CR-39 is a registered trademark of PPG
Display Applications
Information display readout windows and optical filters are custom manufactured from ADC cast sheet per customers specifications for the following original equipment manufacturers and markets :
• Industrial Process Instrumentation'
• Bar Code Scanning Devices and Systems
•
Telecommunications
•
Test and Measurement Instruments
•
Flat Panel Displays
•
Computer CRT Monitors
•
Medical Instruments
•
Scientific Instruments
•
Membrane Switches
•
Opto-electronic Display Devices
•
Consumer Electronics
•
Automotive
•
Aerospace and Military
•
Nuclear
•
Marine
•
Consumer Sport Optics
•
Hand Held Devices
• Portable Data Terminals
Our display readout windows, filters and protective panels are designed to support the following technologies:
• Cathode
Ray Tubes
•
Liquid Crystal Displays, TN, STN
•
Liquid Crystal Displays, Active Matrix
•
Electroluminescent
•
Light Emitting Diode
•
Vacuum Fluorescent Displays
• Incandescent
Sources
•
Gas Plasma
•
Electrochromic
•
Ferroelectric
•
Nuclear Track Detectors
ADC OPTICAL QUALITY CAST SHEET MAIN PROPERTY COMPARISON
Information Display Readout Windows And Contrast Enhancement Filters
The "see-through"or window problem and display contrast enhancement, historically, has been solved by using glass, followed by transparent plastic sheets such as acrylic or PMMA (polymethylmethacrylate) and more recently PC (polycarbonate). These transparent plastic materials have replaced glass in many applications mainly because of their lighter weight, better impact resistance, workability, easily applied antiglare matte finishes, and they are easily colored. These transparent plastic materials, however, exhibit some deficiencies when compared to glass, such as:
•
Poor Chemical And Solvent Resistance
•
Aging Problems, Micro-Cracking, Haze
• Poor Scratch Resistance
These deficiencies may result in the loss of optical, mechanical and contrast enhancement properties of the window or filter. For these reasons, the previously mentioned transparent plastic materials may not always provide the best alternative to glass for information display readout windows and contrast enhancement filters.
The main properties of ADC cast optical sheet are superior to all other transparent plastic materials and provide an alternative to glass. The following table summarizes the main properties of Optical Polymer's International ADC cast sheet compared to the most popular transparent readout window and contrast enhancement filter materials:
Click for Main Property Comparison Chart
ADC
OPTICAL QUALITY CAST SHEET
OPTICAL PROPERTIES
Light Transmission: Allyl diglycol carbonate cast sheet has the highest light transmission of all optical plastics including acrylic, polycarbonate and cellulose acetate butyrate. ADC has a transmission of 92% which is equal to crown glass.
Refractive Index: The refractive index of ADC sheet is 1.50. This compares favorably with the refractive index of glass which is 1.52.
Yellowing Resistance: ADC sheet has the lowest yellowness index and resists yellowing due to aging and environmental conditioning more than all other transparent plastics.
Stress Birefringence: ADC cast sheet is non -birefringent, free of residual stresses and internal strain. ADC sheet is cast optically flat with precise thickness control. These properties make ADC the best choice for Bar Code Scanning laser exit windows and device applications.
Infrared Transmission: ADC cast sheet has unique infrared transmission properties. ADC is transparent to near infrared radiation with a transmission of 90% between 700 to 1100 nm and an average tsransmission of 80%, at wavelengths from 1100-2000 nm.
Dispersion, Abbe Value: ADC sheet has an ABBE value of 59.0 which is the highest of all transparent plastics and the closest to 60.2 for glass. An ABBE value close to glass reduces chromatic aberration or dispersion from color displays.
Haze: ADC cast optical sheet has the lowest haze value of all other transparent plastics.
PHYSICAL PROPERTIES
Abrasion Resistance: The abrasion resistance of ADC cast sheet is at least 20-25 times better than PMMA (Plexiglas) and 50 times better than Polycarbonate (Lexan).
Chemical Resistance: ADC cast optical sheet is resistant to all types of chemicals and solvents, including acetone, acids, alkali and alcohols. It may be cleaned with any cleaning fluid or product. ADC sheet has the best chemical resistance of all optical plastics.
Temperature Resistance: ADC thermoset cast optical sheet will not melt and can be used at operating temperatures up to 150·C. ADC meets, UL 94HB Horizontal Burn Classification .
Lightweight: ADC sheet has a specific gravity of 1.3 compared to 2.5 for glass. ADC weighs half as much as glass, giving significant advantages in weight and handling.
Aging Resistance: ADC cast optical sheet will not craze, peel, flake or loose optical properties with long term exposure to hostile outdoor environments.
Spark Resistance: Unlike glass and other transparent plastics, ADC sheet is resistant to pitting from hot flying sparks, generated during welding, flame cutting and grinding processes.
Radiation Resistance: ADC sheet has outstanding resistance to gamma radiation. ADC is also being used extensively in nuclear track detectors and to measure alpha particles emitted by Radon gas.
ADC OPTICAL QUALITY CAST SHEET PERFORMANCE ADVANTAGES
CHEMICAL RESISTANCE
ADC cast sheet is virtually unaffected by most organic and inorganic chemicals as well as most substances encountered in harsh environments. ADC is resistant to the following:
•
Alcholos
•
Acids, Mineral
•
Ketones
•
Aliphatic Hydrocarbons
•
Aromatic Hydrocarons
•
Halogenated Hydrocarbons
•
Fruit Juices
•
Soft Drinks
•
Gasoline
•
Greases and Oils
•
Detergents
• Silicone Oil
ADC
cast sheet, in many applications, is exposed to various chemicals, harsh
industrial solvents and cleaning solutions. The table below illustrates ADC's superior
resistance to typical long term chemical exposure.
Click for Chemical and Weight Gain Comparison
Abrasion Resistance
ADC
cast optical sheet has superior abrasion resistance compared to other optical
plastics. The chart below compares typical optical plastic materials with ADC and
clearly shows the percent increase in haze after 100 cycles with a 500 gram
weight per ASTM-D-1044 (Taber Abrasion Test).
Click for Plastic & Haze Chart
OPTICAL CLARITY
Optical
clarity, low haze and high light transmission are important properties when
considering optical plastics. ADC has the lowest haze and highest transmission
of other optical plastics. These properties are summarized in the following
table:
Click for Optical Clarity Chart
ADC CAST SHEET PRODUCTION SPECIFICATION
Click for ADC Cast Sheet Production Specs Chart
ADC OPTICAL QUALITY CAST SHEET PART NUMBER IDENTIFICAtion
Click for Optical Quality Cast Sheet Part Number Identification Chart
SPECIALITY FILTERS, COATINGS & MANUFACTURING CAPABILITIES
BAR
CODE LASER SCANNER EXIT WINDOWS
Laser Scanner Exit Windows: Optical Polymers International is the world’s leading manufacturer of bar code laser scanner exit windows for the automatic data collection industry. We have developed a series of proprietary ADC formulations that meet or exceed all industry specifications for optical performance and physical properties.
Replacement Scanner Exit Windows: Optical Polymers International is also the leading supplier of replacement bar code laser scanner exit windows for the repair and remarketinq industry.
IMAGER WINDOWS
OPI's imager windows cast from proprietory ADC exceed all industry optical and physical specifications.
mANUFACTURING CAPAbilities
Precision Laser Cutting: ADC is precision cut to size by state of the art computer controlled laser cutting systems. Typical tolerances of laser cut parts are ± 0.005".
Machining: Secondary machining operations are available as needed to fabricate windows or filters that require beveled edges, counterbores, countersinks, steps or any other 3 dimensional feature.
Silk-Screening: Legends, logos, symbols, masks and borders can be provided by front or rear surface screen printing on the window or filter. Any ink color or color combination is available. Optical Polymers can generate your artwork if needed.
Mounting Adhesives: Display windows, filters and scanner exit windows are often installed with pressure-sensitive adhesive tapes and foam gaskets. We maintain a large inventory of various tapes and foam gasket materials and can provide parts with the adhesive tape applied, ready for installation.
INFRARED FILTERS
Infrared Transmission: ADC cast optical sheet has unique infrared transmission properties. ADC has a near infrared transmission of 90% from 700 nm to 1100 nm and an average transmission of 80% at wavelengths from 1100 nm to 2000 nm.
No Visible Transmission: Our infrared filters have a visible light transmission of less than 1%from 400 nm to 600 nm. These filters appear black in visible region of the spectra with a transmittance of over 90% of the near IR from 700 nm to 1100 nm.
Coatings
Vapor Deposition: OPl's coatings are applied to ADC windows and filters by vapor deposition and are extremely durable. These coatings provide state-of-the art performance to maximize resolution by maintaining a sharp, crisp image.
Antireflection: Broad Band Antireflection coatings provide a superior solution to unwanted surface reflection from windows and filters. These coatings increase brightness and minimize transmission loss of the display information. Our coatings comply with Mil-C-14806 and Mil-M-13S08 . Typical spectral reflectance from a single coated surface is 0.5% from 425nm-700nm.
Conductive: OPI offers a wide range of transparent vapor deposited conductive coatings for EMI/RFI shielding as well as antistatic purposes. Conductivities range from 10 ohms to 100 ohms per square while maintaining high light transmission.
Thermal Rejection: Thermal rejection coatings or Wide Band Hot Mirror coatings are typically used to transmit cool visible light and remove heat (IR radiation) by reflection rather than absorption. Wide Band Hot Mirrors are typically in applications such as outdoor LCD or VFD displays. Typical spectral characteristics are:
Transmittance:
80% average from 450nm to 67Snm
Reflectance:
90% average from 750nm to 1200nm
ADC Typical Property Values
Click for ADC Typical Property Values Chart
Ineed contrast enhancement filter for led display.
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it has almost the same refractive index, chemical resistance and similar mechanical properties as glass.
Posted by: Iphone LCD Screens | 12/13/2010 at 06:52 PM
I want to get some sheet samples and quotation.
I want ADC sheet for mobile window.
Please send me e-mail.
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In many applications it is exposed to various chemicals, industrial solvents and detergents. It shows the resistance higher than the ADC typical long-term exposure.
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Hello,
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Appreciate your time,
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