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 ?
This, says Bayer, is where the excellent print quality of Makrolon OD2015 really pays off.
Like all Makrolon products the new multi UV 3/16-20 series is impact-resistant and stands out for being application-friendly.
The Bayer researchers set to work on Makrolon polycarbonate and succeeded in modifying it for the special requirements of manufacturing processes in the music industry.
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.
Makrolon Hygard laminates will not "spider web" or spall.
Danny Rolph, also exhibiting at Chapter Arts Centre in Cardiff, uses oil and acrylic on various surfaces, including Makrolon plastic (think greenhouse roofing
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.
Polycarbonate, also known by such brand names as Lexan and Makrolon, has applications that widely vary, but it is needed wherever polycarbonate's main features are desired: high impact resistance, temperature resistance and optical quality.
We chose Makrolon 2207 polycarbonate for its predictable, consistent quality from batch to batch and high-impact resistance," says Nomad founders Noah Dentzel and Brian Hahn.
The product Makrolon AG2677 in the color and temperature-stable, heat-absorbing color 771079 is being used on the new smart for the first time.
Bayer MaterialScience has launched a new version of its Makrolon polycarbonate (PC) sheet for the construction sector, which it says offers better surface quality, a co-extruded UV protective coating on both sides, optimised weight and increased bearing capacity over previous grades.
This is because Makrolon LQ3187 has greater impact strength and breaking resistance than standard polycarbonates.