Optical Brightener OB

Chemical Name:


Formula C26H26N2O2S  optical-brightener-ob-tinopal-OB-chemical-structure
MW      430
CAS# 7128-64-5

Synonym Name:

BASF Uvitex Ob, Tinopal OB,  Fluorescent Brightener 184 (FB 184) , c.i.184, Fluorescent Brightener OB


Appearance Slight greenish-yellow powder
Dosage 0.01-0.05%
Melting point 196-200℃
Purity ≥99%
Solubility (g/100 g solution) at 20° C:
Acetone 0.5
Chloroform 14
Dimethylformamide 0.8
Dioxane 2
n-Hexane 0.2
Methanol <0.1
Methylethylketone 1.3
Tricresylphosphate 0.8
Xylene 5


>Optical Brighteners are used to offset the yellowness of a polymer and yield a whiter appearance. OB is used as a thermoplastic (PVC, PS, PE, PP, ABS) optical brightener. Also for coatings, printing inks, paints, dyes, manufactured fibers, synthetic leather, waxes, fats, and oils.  Ob is a general-purpose optical brightener agent.

>Recommended concentrations: 0.02-5% depending on the application and degree of desired whiteness.

Handling and Safety: 

>FDA approved for use in polymers subject to the limitations in 21 CFR §176.170(c).

>For additional handling and toxicological information, please consult us for Maternal Safety Date Sheet.


25kg per fiber drum, 6*2 layer 12 drums per pallet, 5CBM per ton, or according to customers’ requirements.


Tinopal & Uvitex OB, Optical Brightener OB, CAS 7128-64-5, FBA 184 msds

Tinopal & Uvitex OB, Optical Brightener OB, CAS 7128-64-5, FBA 184 tds

Need Sample or Quote?

Related Products

Optical brightener for plastics, cotton, detergent, paper

Product Synonyms CAS Number Features

Optical Brightener For Plastics

FP-127 Uvitex FP 40470-68-6 the best OBA for PVC products
KCB Hostalux KCB 5089-22-5 OBA for plastics and lacquer, especial for EVA
KSB Telalux KSB 7128-54-5 OBA for transparent plastics, recycled PE/PP
KSN Hostalux KSN 5242-49-9 OBA For high-temperature plastics, 100% counter
OB Uvitex OB, Tinopal OB 7128-64-5 universal plastic OBA, also for ink, coating
OB-1 Eastobrite OB-1 1533-45-5 universal plastic OBA,  green or yellow shade
PF FBA 135 1041-00-5 strong red shade

Optical Brightener For Cotton

4BK FBA 113 12768-91-1 for cotton or with fabic blend, red or blue shade
ER-I FBA 199 13001-39-3 powder & liquid form, PE, PA, CA fiber, high temperature whitening
ER-II FBA 199:1 13001-38-2 powder & liquid form, PE, PA, CA fiber, lower temperature whitening
EBF FBA 185 12224-41-8

Optical Brightener For Detergent

CBS-X Tinopal CBS-X 27344-41-8 for detergent, soap, washing

Optical Brightener For Paper

VBL FBA 85 12224-16-7 for paper, also for cotton, vinylon, nylon
BBU FBA 220 16470-24-9 Replace VBL