Chemical name Stilbene derivative Structural formula Specification Appearance: light green powder Fluorescent Color: Slight bluish Whitening strength: 100±3( compared with standard sample) Moisture: ≤6% Ionic character anionic Treating process: 1.exhausting whitening process: 4BK: 0.05-0.8% (o.w.f.), 4BKth ratio: 1: 30, dyeing temperature: 40°C -100°C; Na2SO4:0-10g/l.,start temperature :30°C , heating rate:1-2°C /min, keep the temperature at 50-100℃ for 20-40min, then lower to 50-30°C --> wash--> dry( 100°C ) --> setting (120°C -150°C )×1-2 min( add proper amount leveling agent according to the leveling effect). 2. Padding Process: 4BK:0.5-5g/l, residue liquor ratio:100%, one dip and nip --> dry( 100°C ) -->setting (120°C -150°C )×1-2 min Use: Mainly be used as brightener of contton, linen, silk, polyamide fiber ,wool and paper. Package: It is packed in 20Kgs paper board bucket..It can be packed according to the requirement of the user.

CAS NO:12768-91-1

EC NO:

Molecular Formula:C₄₀H₄₀N₁₂Na₄O₁₆S₄

Molecular Weight:1165.03

Synonyms:;Fluorescent Brightening 4BK;4BK;Optical Brightening Agent 4BK;

Molecular Structure: