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What is the difference between optical brightener OB and OB-1?

Optical brightener OB and OB-1 are widely used plastics(PE, PP, PVC, ABS, EVA, PS, PC and other plastics; 

polyester fiber, nylon fiber, polypropylene fiber and other chemical fiber whitening) Most of the plastic OB and 

OB-1 can be used in general, and have a very obvious whitening and brightening effect

What is their diffrence?

1. OB and OB-1 are totally different chemicals

Optical brightener OB

chemical name: 2,5-Di(5-tert-butylbenzoxazol-2-yl)thiophene

Appearance: light yellow crystal powder

Optical brightener OB-1

Chemical name:  2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole 

Appearance: yellow green crystal powder

2. Melting point diffrent: OB-1 > ob

Melting point of OB: 201-203 ° C,Melting point of OB-1:355-360 ° C,Like the

air-conditioning shell, kitchen utensils only OB-1 can be selected for high-temperature processing

3. Dispersion and stability: OB > OB-1

Good dispersion means that the product is more easily soluble and uniform. For example, paint and ink have high 

dispersion requirements for fluorescent whitening agent. Good stability means that the product is not easy to migrate

and turn yellow in the later stage. For example, some shoelaces of poor quality are white and clean when they are 

bought back, but they turn yellow and change color soon, which means that the stability of fluorescent whitening

agent is poor.

4. The whiteness of OB is lower than OB-1 due to different e values

5. The biggest difference between OB and OB-1 is the price,some time OB price arrived double time as OB-1


Therefore, customers who can use fluorescent whitening agent OB-1 should try to choose OB-1. For customers 

with special requirements, such as high-end ink coating and soft plastic, it is recommended to use OB.

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