Can transmittance of uv /vis spectra changes for the same polymer EVA when change faces?

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Agata Niemczyk

In my opinin only if the faces are different, in for example roughness.

Abdelkader BOUAZIZ

Dear all, yes and various parameters may contribute to that, such as chains orientation, crystallinity, thermal phase heterogeneity (due to nonuniform cooling down), air bubbles, stress history, and possibly others. My Regards