This Optical Brightening Agent (fluorescent brightener,Optical brightener) is powder,and it has a good quality .

Optical Brightening Agent BBU(C.I.220) (fluorescent brightener,Optical brightener)

Chemical name	Stilbene bistriazine derivative
Structural formula
Specification	Appearance: Slight yellow powder Fluorescent Color: Similar to the standard sample Whitening strength: 100±3( compared with standard sample) Moisture: ≤6% Ionic character anionic
Treating process:	1.Addition via size press: combined with starch, CMC, PVA and other products designed for surface sizing. Usual dosage: 0.5~5g/l 2.Addition to the pigment coating mixtures: adding in any stage of building coating material. Good performance with the carrier of CMC, PVA and starch. Usual dosage: 0.1~0.3% on dry white pigment. 3.Addition to the stock: adding without dilution. Usual dosage: 0.05~0.5% on dry pulp. For actual application, the process should be adjusted according to correspondent sample-test.
Property:	1.Convenient in application,diluted with water perfectly, suitable for continuous addition. 2.Good acid stability 3.Great performance in size press and pigment coating mixtures
Use:	Mainly be used in size press, pigment coating mixtures.
Package:	20kg or for the special demand.

Note: It needs to be declared that the above data is based on our present knowledge and experience; owing to too many affecting factors, these data cannot be free from their check and test when processing and using the product.