UV Absorbance of PET

Polyester film absorbs ultraviolet energy. The amount of absorbance is dependent upon the wavelenth of interest and the source of the ultraviolet energy. The table below provides typical absorbance values for the four ultraviolet wavelength bands. The graph below shows ultraviolet absorbance as a function of wavelength.

If additional absorbance is desired, ultraviolet blocking additives can be incorporated into the polyester or into other layers of a composite structure.

Percent Absorbance of UV Energy by PET

Percent Absorbance of UV Energy by PET
UV C UV B UV A UV V
250 – 260 nm 280 – 320 nm 320 – 390 nm 395 -445 nm
34 71 12 8

 

Percent Absorbance of UV Energy by PET

UV-absorbance-of-PET-graph