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MK OB1 is a high molecular weight optical brightener of the stilbene benzoxazol class, suitable for the optical brightening of the polymers at all stages of processing.

MK OB1 is a highly effective fluorescent whitening agent in a variety of polymer substrates, especially polyester and polyamide fibers as well as polycarbonate, acrylics, styrene homo- and co-polymers including ABS, polyolefins and EVA.

MK OB1 is mainly applied to the polyester, polyamide and polypropylene textile fibers, molded articles, films and sheets. It can be used as a tracer in a variety of applications or in a variety of blends and combinations with processing, heat and light stabilizers.

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