Refractive index database

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Optical constants of EVASKY S88
Vogt et al. 2016: n,k 0.25–2.5 µm

Wavelength: µm

Complex refractive index (n+ik)[ i ]

n   k   LogX   LogY   eV

Derived optical constants


Conventional ethylene-vinyl acetate (EVA) with high UV absorption. Room temperature.


1) M. R. Vogt, H. Schulte-Huxel, D. Hinken, H. Holst, M. Winter, S. Blankemeyer, R. Witteck, M. Köntges, K. Bothe, R. Brendel. Optical constants of UV transparent EVA and the impact on the PV module output power under realistic illumination, Energy Procedia 92, 523-530 (2016)
2) M. R. Vogt. Development of physical models for the simulation of optical properties of solar cell modules, PhD. Thesis (2015)


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Ethylene-vinyl acetate, (C2H4)n(C4H6O2)m (EVA)

Ethylene-vinyl acetate (C2H4)n(C4H6O2)m (EVA) is a copolymer composed of ethylene and vinyl acetate. This versatile material is known for its excellent flexibility, resilience, clarity, and resistance to UV radiation. It's softer and more flexible than polyethylene and possesses a lower melting point. EVA's unique properties stem from its varied content of vinyl acetate (typically ranging from 5% to 50%), with higher content increasing its softness and flexibility. This copolymer is widely used in various applications including foam shoe soles, hot melt adhesives, films for packaging, and even toys. Its versatility extends to other specialized uses like solar panel encapsulation and as a component in biomedical devices due to its biocompatibility. EVA is also known for its ease of processing, making it a preferred material for various fabrication methods.

Other names

  • Poly(ethylene-vinyl acetate) (PEVA)
  • Poly(ethylene-co-vinyl acetate)
  • Polyethylene-vinyl acetate copolymer



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