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Polyethylene
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===Optical === Depending on thermal history and film thickness, PE can vary between almost clear ([[transparency and translucency|transparent]]), milky-opaque ([[translucent]]) and [[Opacity (optics)|opaque]]. LDPE has the greatest, LLDPE slightly less, and HDPE the least transparency. Transparency is reduced by [[crystallite]]s if they are larger than the wavelength of visible light.<ref>Chung, C. I. (2010) ''Extrusion of Polymers: Theory and Practice''. 2nd ed.. Hanser: Munich.</ref>
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