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Specification
| Parameter | Typical Range | Notes |
| Polymer Base | PET, PA6, PA66, PP | PET in-mass grade most common |
| OBA Type | In-mass (melt-spun) / Surface-applied | In-mass = permanent; surface = economical |
| OBA Loading Level | 0.05 % – 0.5 % by weight | Higher loading = stronger fluorescence; upper limit set by migration regulations |
| Denier Range | 30D – 600D | Fine denier more common for apparel & home textiles |
| Filament Count | 24f – 288f | Higher counts maximize light-scattering surface area |
| Whiteness Index (CIE) | 120 – 180 WI | Standard optical white: 140–160; High-white: 160–180 |
| Brightness (L*) | 93 – 99 | Measured under D65 illuminant / 10° observer |
| Luster | Bright / Semi-dull | Full-dull TiO₂ suppresses fluorescence — not recommended |
| Wash Fastness (ISO 105-C06) | Grade 4 – 5 (in-mass) | Surface-applied: Grade 3–4 |
| UV Exposure Stability | Minimal yellowing after 100h UV exposure (in-mass) | Surface OBA may yellow faster outdoors |
| Tenacity | 3.5 – 5.5 g/d | OBA addition does not affect mechanical properties |
| Cone Weight | 2 kg / 5 kg / 10 kg | Packaged in UV-protective bags to prevent pre-activation |
| Compliance | REACH / OEKO-TEX / CPSC | Skin-contact and infant-wear grades available |
Application
Optical brightening yarn is specified wherever pure, luminous whiteness is a visible quality cue or a functional safety requirement:
- Bridal & Formal Wear Fabric — The fluorescence of OBA yarn produces the distinctive "blue-white" brilliance associated with premium bridal satin, organza, and chiffon — a visual quality signal that buyers immediately associate with luxury.
- Medical & Hygiene Textiles — Surgical drapes, hospital linens, and hygiene nonwovens use optical brightening yarn to signal cleanliness and sterility. The bright-white appearance reassures patients and complies with facility standards.
- Sportswear & Athletic Apparel — Activewear brands use OBA yarn in white and light-colored fabrics to maintain a vivid, fresh appearance throughout the garment's service life, resisting the gradual yellowing that affects standard polyester whites.
- Home Textiles — Bedding & Table Linen — White sheeting, duvet covers, and tablecloths benefit from OBA yarn's persistent whiteness through repeated commercial laundering at 60–90 °C, maintaining the premium appearance that hospitality and retail brands require.
- Embroidery & Decorative Thread — OBA-brightened embroidery thread produces luminous white fills and outlines on colored backgrounds, with the fluorescence creating an almost three-dimensional visual pop under both daylight and UV stage lighting.
- Safety & Visibility Applications — Under UV black-light illumination, OBA yarn fluoresces visibly — used in authentication threads, anti-counterfeit fabric labeling, and theatrical or safety textiles requiring UV-reactive elements.
Advantage
- Visibly Whiter Than Conventional Optical White — Standard "optical white" polyester achieves a CIE Whiteness Index of 90–110. Our in-mass OBA yarn reaches 140–180 WI — a difference clearly visible to the naked eye under daylight or fluorescent lighting, making finished fabrics stand out on shelf without additional bleaching.
- Permanent Brightening — Wash After Wash — In-mass OBA loading means the brightening agent is locked inside the filament matrix, not on its surface. It cannot be washed out, rubbed off, or reduced by standard commercial laundering at up to 90 °C — critical for hospitality linen and medical textile applications with rigorous wash cycles.
- No Additional Brightening Step in Dyehouse — Standard white polyester requires OBA topping in the dyebath to achieve acceptable whiteness. Our pre-brightened yarn arrives at your dyehouse already at target whiteness, eliminating the OBA chemical dosing step and reducing effluent load.
- UV Fluorescence for Anti-Counterfeit & Authentication — In-mass OBA yarn fluoresces strongly under 365 nm UV light, enabling its use as an invisible authentication marker in high-value fabrics, labels, and technical textiles — a feature that cannot be replicated by surface finishing alone.
- OEKO-TEX Compliant Grades Available — Our skin-contact and infant-wear OBA grades use fluorescent agents from the OEKO-TEX approved substance list, meeting STANDARD 100 Class I (baby products) requirements — allowing use in the most sensitive end-use categories.
- Compatible With Standard Dyeing Processes — OBA yarn can be overdyed in pastel and light shades without suppressing the brightening effect, as long as dye concentration remains below the fluorescence-suppression threshold — our technical team provides dyehouse guidelines with each order.
