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Ask for price we provide quality optical whitening agent or optical brightening agents for various requirements of textile, paper and detergent industries. available at competitive prices, our optical whitening agent are suitable for different applications and in …

The whitening effect of optical brightener agent could be estimated by visual method which better under the sunlight or measure by colorimeter. 3.light fastness there is no international standard for testing optical brightener lightfastness in plastics.most tests used din 54004 for reference.

Factory supply fluorescent brightener vbl cas 12768-92-2 cas 28950-61-0 cas5089-22-5 cas 16470-24-9. ... chemicals raw materials optical brightening agent vbl 85 fluorescent brightener vbl 85 for cotton fabric. chongqing jinlinyuan environmental protection technology co., …

Whitening agents / optical brighteners are additives that impart brightness to polymers and intensify the degree of whiteness. these agents function on the basis of the ‘fluorescence effect’; they absorb light in the uv spectrum and emit light in the blue region of the visible spectrum to yield a brighter and fresher appearance to the plastic.

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