Fluorescent Whitening Agent (Paper Grade OBA)
Fluorescent whitening agents (FWA) or optical brightening agents (OBA) for paper are stilbene-based or coumarin-based compounds that absorb UV light and re-emit it as visible blue light, significantly increasing the perceived whiteness and brightness of paper. They are applied at the wet end, size press, or in coating colors, and are essential for premium white printing and writing papers.
Technical Specifications
| pH | 9.0–11.0 |
| appearance | Clear to slightly hazy yellow-green liquid |
| active content (%) | 22±2 |
| whiteness gain (ISO units at 1 g/t) | 3–6 |
Applications
- Wet-end brightness improvement for printing and writing paper
- Size press application for enhanced paper whiteness
- Pigment coating color brightening component
- Tissue and hygiene paper whiteness enhancement
- Copy paper and office paper brightness upgrade
Key Features
- High fluorescence efficiency for maximum whiteness per unit cost
- Compatible with wet-end, size press, and coating applications
- Does not adversely affect sizing, strength, or printability
- Multiple grades available: 2-sulfonate, 4-sulfonate, 6-sulfonate
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