Optical Brightening Agent VBL (for Cotton)
CAS Number: 4404-43-7
Optical Brightening Agent VBL (stilbene-type) is the most widely used fluorescent whitening agent for cotton, viscose, and linen fabrics. It absorbs near-UV light and re-emits blue-white fluorescence, significantly enhancing the whiteness and brightness of bleached cellulosic textiles. Compatible with standard alkaline bleaching, applied by pad or exhaust methods.
Technical Specifications
| shade | Blue-white fluorescence |
| appearance | Light yellow to greenish-yellow powder |
| moisture (%) | ≤5 |
| active content (%) | ≥98 |
| whiteness (Berger) | ≥130 |
| solubility (g/L, 60°C) | ≥50 |
Applications
- Whitening of bleached cotton woven and knitted fabric
- Combined bleaching and brightening single-bath process
- Optical brightening of viscose rayon and lyocell fabric
- Paper and textile whitening in combined fabric processing
- Whitening of cotton yarns for weaving and knitting
Key Features
- Highest whiteness increase per gram for cotton among stilbene-type OBAs
- Stable under alkaline bleaching conditions (pH 10–12)
- Compatible with H2O2 bleaching baths for single-step application
- Compliant with REACH regulations and restricted substances lists
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CAS Number
4404-43-7
Category
Textile Dyeing AuxiliariesAvailability
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