polycarbonate

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polycarbonate

(pŏl″ē-kăr′bĭ-nāt, -nĭt) [″ + ″]
A transparent polymer used to manufacture eye protectors, shields, and other medical devices.

Polycarbonate

A very strong type of plastic often used in safety glasses, sport glasses, and children's eyeglasses. Polycarbonate lenses have approximately 50 times the impact resistance of glass lenses.

index of refraction

The ratio of the speed of light in a vacuum or in air, c, to the speed of light in a given medium, v. Symbol: n. Hence,
n = c/v
The speed of light in a given medium depends upon its wavelength. Consequently, the index of refraction varies accordingly, being greater for short wavelengths (blue) than for longer wavelengths (red). The index of refraction forms the basis of Snell's law, which quantitatively determines the deviation of light rays traversing a surface separating two media of different refractive indices. Syn. refractive index. Plural: indices. See dispersion; law of refraction; gradient-index lens; high index lens; speed of light; refractometer.
Table I3 Refractive indices of some transparent media at selected wavelengths
spectral lineGFDCA
OriginCalciumHydrogenSodiumHydrogenOxygen
wavelength (nm)430.8486.1589.3656.3759.4
aqueous or vitreous humour1.34401.34041.33601.33411.3317
crystalline lens1.43071.42591.42001.41751.4144
spectacle crown1.53481.52931.52301.52041.5163
dense flint1.63971.62901.61701.61221.6062

Table I4 Index of refraction n of various media for sodium light (λ = 589.3)
air1.00
water (at 20ºC)1.333
spectacle crown glass1.523
flint glass (dense)1.62
flint glass (extra dense)1.65-1.70
titanium oxide glass1.701
calcite crystal
ordinary ray1.658
extraordinary ray1.486
quartz crystal
ordinary ray1.544
extraordinary ray1.553
diamond2.42
Canada balsam1.53-1.54
CR-391.498
polycarbonate1.586
silicone rubber1.44
CAB1.47
PMMA1.49
HEMA1.43
hydrogel polymer
20% water content1.46-1.48
75% water content1.37-1.38
eye
tears1.336
cornea1.376
aqueous humour1.336
crystalline lens (average effect)1.42
vitreous humour1.336

plastic 

Various organic or synthetic materials (e.g. CR-39, HEMA, polymethyl methacrylate, polycarbonate, etc.) that can be transformed into solid shapes to make spectacle frames, contact lenses, ophthalmic lenses, etc. and can be made to have good optical surfaces, high light transmission and refractive indices and dispersions similar to that of crown or flint glass. See acetone; index of refraction; plastic spectacle frame.
References in periodicals archive ?
Makrolon UV AdLight is easy to machine with conventional tools from wood and metal processing and can withstand continuous use of temperatures between -100 and 120 degrees Celsius.
Bayer MaterialScience develops, produces and sells Makrolon polycarbonate sheets, Axpet and Vivak polyester sheets, as well as Bayloy high-quality plastic sheets.
Makrolon Polycarbonate - a Multi-talent Thanks to its versatility, Makrolon polycarbonate now has a world market share of 30 percent and is one of the best-selling products of the Bayer Group.
But Bayer's Makrolon Rx2530 polycarbonate was the only one that offered the multiple characteristics we needed to house the electrodes, signal wires and thermistors required to measure tissue pH and temperature accurately.
The backbone consists of three bonded layers of extruded Makrolon polycarbonate that formed the profile of the shark.
Makrolon Hygard laminates will not "spider web" or spall.
will begin in-store testing of its Passive Image Transmitter (PIT) display units made with Bayer Plastics' Makrolon polycarbonate resin, a much lighter and durable material than traditional plastics.
Working with the Swiss division of Bayer Plastics, researchers from both companies jointly developed Makrolon Rx-l805 lipid-resistant polycarbonate resin, a new grade of Makrolon.
PROCESS: process engineering as applicable to algae utilization for biofuels (Jacobs Engineering), vision image analysis system for bubble analysis and optimization of algal production processes, EnviroCam[TM] (Sheffield Forgemasters), high-throughput bulk lipid content analysis in algae using TD-NMR technology without using chemicals (Bruker Optics), an economical solution to water analysis control and monitoring requirements as well as alarming and data logging in a single, user-friendly control package (Iwakiamerica), and photobioreactors using Makrolon Polycarbonate (Bayer Material Science);
Tenders are invited for Bottle Holder With Baseas Per Polycarbonate Makrolon 6557
The company, formally known as Bayer MaterialScience, introduced Makrolon TC8030 (TC - thermally conductive) polycarbonate at the International LED professional Lighting Symposium + Expo in Bregenz, Austria, last month.