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Sylic fluorescent whitening agent / optical brightening agent 588 vbl for polyester triacetate fiber application hangzhou chungyo chemicals co., ltd. us $1.00-$2.00 / kilogram

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.

Molecular formula:c 18 h 15 cln 2 o 6 s molecular weight: 422.84 cas registry number:7023-61-2 manufacturing methods :2-amino-4-chloro-5-methylbenzenesulfonic acid diazotization, and 3-hydroxy-2-naphthoic acid coupling, and then into calcium salt. properties and applications:brilliant red, shallow blue light pink.purple red powder. insoluble in water and ethanol.

Optical brightening agent er-ii by anyang general chemical is a non-ionic 1-(2-cyanostyryl)-4-(4-cyanostyryl)benzene. it is used in the whitening and brightening of coatings. optical brightening…

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