Optical Brightening Agents — OBA (4BM / BA-L, BBU, VBL, CXT & OB-1)
Full spectrum of Stilbene Optical Brightening Agents for brilliant bluish-white and violet-white finishing of cotton knit/woven fabrics (4BM, BA-L, BBU, VBL), polyester (ER-I/II/III), and detergents (CBS-X, CXT).
Typical Certificate of Analysis (COA) — Optical Brightening Agents — OBA (4BM / BA-L, BBU, VBL, CXT & OB-1)
Every container indented by Hafsa Sourcing is accompanied by a batch-specific factory Certificate of Analysis (COA) and optional SGS / Bureau Veritas Pre-Shipment Inspection report verifying the parameters below:
| Test Parameter | Export Spec Limit | Typical Batch Value | Test Method |
|---|---|---|---|
| UV Extinction Value (E 1% 1cm) | BBU: ≥ 360 | VBL: ≥ 540 | CXT: ≥ 510 | 100.5% Std Strength | HG/T 3726 |
| Shade & CIE Whiteness vs. Standard | Similar (ΔW ≤ ±1.5) | Complies (Bluish/Violet) | Datacolor CIE Whiteness |
| Insoluble Matter in Water | ≤ 0.20% | 0.06% | HG/T 3726 |
| Fineness (Residue on 180 μm Sieve) | ≤ 2.0% | 0.5% | HG/T 3726 |
Industrial Applications in Bangladesh
Bangladesh Market Context: Full-white cotton T-shirts, dress shirts, and bedsheets exported from Bangladesh require CIE Whiteness > 145–155, achieved by dosing OBA 4BM/BA-L or BBU directly in the H2O2 bleaching or pad-thermosol bath.
- OBA 4BM / BA-L (C.I. 113) & BBU (C.I. 220): Exhaust and pad-batch optical brightening of cotton knits, yarn, and woven fabrics
- OBA ER-I / ER-II (C.I. 199): High-temperature & pad-thermosol whitening of polyester and CVC/PC blends
- OBA CXT (C.I. 71) & CBS-X (C.I. 351): High-stability whitening in synthetic laundry detergent powders and liquid detergents
- OBA OB-1 (C.I. 393): Masterbatch, recycled PET flake, and engineering plastic whitening
Import & L/C Indenting Parameters
- Standard Export Packaging
- 25kg Fiber Drums with Double PE Liners (Powder) or 200kg/1000kg IBC (Liquid BA-L)
- 20ft FCL Container Payload
- 14.0 – 16.0 MT (Fiber Drums) / 20.0 MT (Liquid IBCs) per 20ft FCL
- Chinese Production Hub
- Hebei / Shandong / Zhejiang, China
- Bangladesh Customs & Regulatory Note
- Classified under dedicated Bangladesh Customs Fluorescent Brightening Agent HS Code 3204.20.00.
- Trade Synonyms
- OBA 4BM • OBA BA-L (C.I. 113) • OBA BBU (C.I. 220) • OBA VBL (C.I. 85) • OBA CXT (C.I. 71) • OBA ER / OB-1
Other Textile Pretreatment, Dyeing & Finishing Auxiliaries Sourced from China
Wetting, Scouring & Mercerizing Agents (APEO/NPEO-Free)
100% APEO/NPEO-free non-ionic/anionic wetting, emulsifying, and mercerizing auxiliaries engineered for rapid cotton wax/pectin removal and stability up to 300 g/L Caustic Soda.
Formaldehyde-Free Fixing, Leveling, Soaping & Peroxide Stabilizer Concentrates
High-concentration mother liquors of Formaldehyde-Free Reactive Fixing Agents, Silicate-Free Peroxide Stabilizers, and Anti-Redeposition Soaping Agents for export dyeing mills.
Hydrophilic Block Silicone Oil (70–100%) & Cationic Softener Flakes (100%)
Self-emulsifying Hydrophilic Block Silicone Crude Oils (70%–100%) and cold/hot-water dispersible Cationic & Non-Ionic Softener Flakes for luxury knitwear, terry towels, and denim.