Optical Brightening Agent 351 (for Polyester)
CAS Number: 13001-39-3
Optical Brightening Agent 351 (benzoxazole-type) is the premier fluorescent whitening agent for polyester and polyester-blend fabrics. Applied by high-temperature exhaust (130°C) or thermosol continuous process, it diffuses into polyester fiber to deliver brilliant blue-white fluorescence with excellent sublimation and wash fastness. Essential in white and pastel polyester fabric production.
Technical Specifications
| appearance | White to light yellow powder |
| moisture (%) | ≤1 |
| active content (%) | ≥99 |
| whiteness (Berger) | ≥150 |
| melting point (°C) | 200–205 |
| solubility in DMF (g/100mL) | ≥5 |
Applications
- HT exhaust brightening of polyester fabric and yarn
- Thermosol continuous brightening of polyester woven goods
- Brightening of polyester-cotton blends in combined dye-OBA baths
- Whitening of polyester nonwovens for hygiene products
- Brightening of recycled polyester (rPET) textile products
Key Features
- Designed specifically for polyester HT dyeing and thermosol process
- Excellent sublimation resistance for heat-transfer printed polyester
- Very high whiteness values achievable with low dosage
- Compatible with disperse dyes for simultaneous dyeing-brightening
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CAS Number
13001-39-3
Category
Textile Dyeing AuxiliariesAvailability
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