Fluorescent Whitening Agents for Plastics: Techno Brief

Fluorescent Whitening Agents (FWAs) also called Optical brighteners are chemical compounds that absorb light in the ultraviolet and violet region of the electromagnetic spectrum, and re-emit light in the blue region. These additives are often used to enhance the appearance of color of fabric and paper, causing a "whitening" effect, making materials look less yellow by increasing the overall amount of blue light reflected. In this techno brief you will find about FWAs’ mode of action and their applications.

Fluorescent Whitening Agents in PET Fibers

An essential criterion for the technical suitability of Fluorescent Whitening Agents is its light fastness in the substrate. The stability of brightening agents in PET fibers is shown in the figure below:

Light Fastness of whitening effect in PET fibers
Figure 1 : Light Fastness of whitening effect in PET fibers

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