Optical Brightener OB CAS No. 7128-64-5
  • Air ProOptical Brightener OB CAS No. 7128-64-5
  • Air ProOptical Brightener OB CAS No. 7128-64-5
  • Air ProOptical Brightener OB CAS No. 7128-64-5

Optical Brightener OB CAS No. 7128-64-5

Optical Brightener OB,other name Fluorescent brightener OB, Fluorescent whitening agent 184,Cas No. 7128-64-5, widely used in PE whitening and PP whitening ,paint and ink whitening ,injection molding, blown film whitening, color masterbatch whitening and brightening, PVC whitening, transparent plastic products and polyester fiber whitening.

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Product Description

Optical Brightener OB

Fluorescent whitening agent 184,2,5-Di (5-tert-butylbenzoxol-2-yl) thiophene,light yellow powder, odorless, Cas No. 7128-64-5, molecular formula C26H26N2O2S, mainly used in PVC, PS, PE, PP, ABS and other plastics and acetate fiber, paint, ink and other whitening. Because of its good transmittance, it is suitable for whitening transparent plastic products.

1.Performance Metrics


Optical Brightener OB

Molecular formula:


Molecular weight









light yellow powder

Melting Point

196-203 °C

Decomposition Temperature

above 220 °C

Color Light

bright blue light

UV absorption



(1) injection molding, blown film, color masterbatch, PVC


(3) transparent plastic products, hot-melt plastic

(4)Paint, ink, wallpaper

(5)Polyvinyl chloride, polystyrene, polypropylene, polyethylene, acrylonitrile, butadiene, styrene copolymer, styrene, acrylonitrile copolymer, butadiene cellulose acetate, polyamide (PA) , Poly(methyl methacrylate) , acrylic resin, polyester fiber (polyester)

3. Usage

(1) polyvinyl chloride: 0.01 ~ 0.05% increase brightness: 0.0001 ~ 0.001%

(2) polystyrene: 0.0001 ~ 0.05% ABS: 0.01 ~ 0.05%

(3) colorless polyolefin matrix: 0.0005 ~ 0.001% ; white matrix: 0.005 ~ 0.05% ; White: 1-5 parts per million (10g)

Transparent material: 0.01 parts per million (0.1)(0.1 g-1 g)(can improve the brightness of PVC) ;

(4) PS: 0.1 parts per million white (1g) ; 0.01 parts per million transparent (0.1 g-1g) ;

(5) ABS: 1 part per million (10g-50g)(can effectively eliminate the inherent yellow in ABS)

(6) PE, PP: colorless, 0.05 part per million (0.5 G-1g) white 0.5 part per million (5g-50g) ;


25kg cardboard drum, lined with plastic bags or according to customer requirements packaging.

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