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    AI Overview
    Optical brightener OB-1 CAS 1533-45-5 4,4′-Bis(2 ...
    Optical Brightener OB-1 (CAS 1533-45-5) is a high-efficiency fluorescent whitening agent for plastics, polyester, and nylon, known for its superior heat resistance (melting point 359-362°C) and strong, bright blue-white fluorescence. It is ideal for high-temperature processing, effectively masking yellowing with low dosage (0.005–0.2%) and excellent lightfastness. 
    Key Characteristics 
    • Chemical Name: 2,2′-(4,4′-Diphenol vinyl) dibenzoxazol (or 4,4′-Bis(2-benzoxazolyl)stilbene)
    • Chemical Formula:
      𝐶28
      𝐻18
      𝑁2𝑂2
    • Appearance: Yellow-green crystalline powder
    • Melting Point: 359-362°C
    • Fluorescence Color: Bright blue-white
    • Stability: Highly stable and insoluble in water 
    Applications 
    OB-1 is used for whitening a wide range of materials: 
    • Plastics: Polyester (PET), Nylon (PA), Polypropylene (PP), Polycarbonate (PC), ABS, Rigid PVC, EVA, Polystyrene (PS).
    • Fibers: Polyester and Nylon fibers.
    • Processes: Suitable for high-temperature engineering plastics and hot-melt pad dyeing. 
    Key Benefits 
    • High Temperature Resistance: Ideal for engineering plastics processed above 300°C.
    • High Efficiency: High whitening strength allows for very low dosage.
    • Superior Durability: Excellent lightfastness and resistance to migration. 
    Usage Notes 
    • Dosage: Typically 0.005–0.2% by weight, depending on the application.
    • Dispersion: Ensure proper dispersion in high-viscosity materials like PC or PA to prevent yellowing or spots.
    • Storage: Keep in a cool, dry, well-ventilated area. 
    • China Optical brightener OB-1 manufacturer and supplier
      Apr 27, 2024 — Optical brightener OB-1 Features 1. high whitening strength and strong fluorescence. 2. wide application scope: polyester, nylon f...
      Longchang Chemical
    • Optical brightener OB-1 CAS 1533-45-5 - Unilong
      Description. Optical Brightener OB-1, also known as Fluorescent Brightener 393 or 4,4′-Bis(2-benzoxazolyl)stilbene, is one of the ...
      unisunchem.com
    • OPTICAL BRIGHTENER OB-1 Wholesale - Jiangxi Lotchem Co., Ltd.
      OPTICAL BRIGHTENER OB-1 (CAS:1533-45-5) Share: Optical Brightener OB-1 is excellent oxazole type brightener, Mainly used in whiten...
      Jiangxi Lotchem Co., Ltd.
    • Optical Brightener OB-1 China Cas No.:1533-45-5
      Optical Brightener OB-1/ China Cas No.:1533-45-5 is an excellent oxazole brightener, insoluble in water, stable in performance, an...
      Raytop Chemical
    • Optical brightener agent OB-1 TDS - Raytop Chemical
      Supplementary Notes. General Considerations: Thermal Stability: OB-1 degrades at temperatures above ~300°C; adjust dosage for high...
      Raytop Chemical
    • Optical Brightener OB-1 (FBA 393) CAS 1533-45-5 - Kerton Chemical
      Introduce: The chemical name of Optical Brightener OB-1 (FBA 393) is 2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole, which is...
      Zhengzhou Kerton Chemical Co., Ltd
    • Optical brightener OB-1 - Shandong Grand Chemical Co., Ltd.
      Product name: Optical Brightener OB-1; Chemical Name: 2,2′- (4,4′-distyryl) bisbenzoxazole; C.I.: 393; CAS: 1533-45-5; Molecular F...
      Shandong Grand Chemical Co., Ltd.
    • Optical Brightener Agent OB-1 - sinosunman
      Chemical name: 2.2'-(4.4;-diphenol vinyl) dibenzoxazol. CAS NO. 1533-45-5 C.I.NO.393. Molecular Formula: C28H18N2O2 Properties: OB...
      sinosunman
    • Optical Brightener OB-1 - Subh Chem - 7128-64-5 - White - HIPS - Knowde
      Optical Brightener OB-1 is a high molecular weight fluorescent whitening agent, which significantly improves the whiteness in both...
      Knowde
    • China Optical brightener OB-1 manufacturer and supplier
      Apr 27, 2024 — Optical brightener OB-1 Features 1. high whitening strength and strong fluorescence. 2. wide application scope: polyester, nylon f...
      Longchang Chemical
    • Optical brightener OB-1 CAS 1533-45-5 - Unilong
      Description. Optical Brightener OB-1, also known as Fluorescent Brightener 393 or 4,4′-Bis(2-benzoxazolyl)stilbene, is one of the ...
      unisunchem.com
    • OPTICAL BRIGHTENER OB-1 Wholesale - Jiangxi Lotchem Co., Ltd.
      OPTICAL BRIGHTENER OB-1 (CAS:1533-45-5) Share: Optical Brightener OB-1 is excellent oxazole type brightener, Mainly used in whiten...
      Jiangxi Lotchem Co., Ltd.
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    Optical Brightener Eastobrite OB-1, CAS# 1533-45-5 Mfg


    baoxu chemical
    https://www.additivesforpolymer.com › Portfolio
    baoxu chemical
    https://www.additivesforpolymer.com › Portfolio
    Dive Deeper
    Optical Brightener OB-1 Is A High Temperature Fluorescent Whitening Agent For Polyester Fiber, Polyamide, Nylon. CAS 1533-45-5, Replace Eastobrite OB-1.

    Optical brightener OB-1 | 1533-45-5


    ChemicalBook
    https://www.chemicalbook.com › ... › CAS DataBase List
    ChemicalBook
    https://www.chemicalbook.com › ... › CAS DataBase List
    Dive Deeper
    Jan 13, 2026 — CAS No. 1533-45-5 ; Chemical Name: Optical brightener OB-1 ; CBNumber: CB2293303 ; Molecular Formula: C28H18N2O2 ; Molecular Weight: 414.45.Read more

    Optical Brightener OB-1 China Cas No.:1533-45-5


    Raytop Chemical
    https://www.raytopoba.com ›
    Raytop Chemical
    https://www.raytopoba.com ›
    Dive Deeper
    Optical Brightener OB-1/ China Cas No.:1533-45-5 is an excellent oxazole brightener, insoluble in water, stable in performance, and has good heat resistance.Read more
    5.0(3)

    Optical brightener OB-1


    Shandong Grand Chemical Co., Ltd.
    https://obachemical.com › product › optical-brightener-...
    Shandong Grand Chemical Co., Ltd.
    https://obachemical.com › product › optical-brightener-...
    Dive Deeper
    Optical Brightener OB-1 is mainly used for brightening polyester resin and fiber, nylon, PP, ABS, PS, HIPS, PA, PC, EVA, rigid PVC, etc.

    Optical Brightener Agent OB-1


    sinosunman
    https://www.sinosunman.com › optical-brightener-agent...
    sinosunman
    https://www.sinosunman.com › optical-brightener-agent...
    Dive Deeper
    OB-1 is an effective brightener for many plastics. OB-1 provides an excellent white, permanent color since the brightener is dissolved in the polymer or fiber.Read more

    Optical Brightener OB-1/Fluorescent Brightener 393 with Cas ...


    autechindustry.com
    https://www.autechindustry.com › product › optical-bri...
    autechindustry.com
    https://www.autechindustry.com › product › optical-bri...
    Dive Deeper
    Chemical Name:Optical Brightener OB-1 · CAS No.: 1533-45-5 · EINECS: 216-245-3 · Molecular Formula: C28H18N2O2 · Molecular weight:414.45 · Appearance:Bright ...Read more

    Optical Brightener OB-1 (C.I 393) CAS 1533-45-5


    lealchem.com
    https://www.lealchem.com › portfolio › items › optical-...
    lealchem.com
    https://www.lealchem.com › portfolio › items › optical-...
    Dive Deeper
    Dosage: Optical brightener OB-1 is commonly used in the amount of 0.01-0.03%, that is,. each 100kg of the materials, the optical brightener OB-1 takes 10g-30g ...Read more

    Optical Brightener (OB-1), CAS#1533-45-5


    Hebei Medipharm Co., Ltd
    https://www.hbmedipharm.com › optical-brightener-ob-...
    Hebei Medipharm Co., Ltd
    https://www.hbmedipharm.com › optical-brightener-ob-...
    Dive Deeper
    OB-1 is used for the whitening of polyester liquid, especially for the whitening of polyester fiber and the whitening of polyester and cotton and other blended ...Read more

    Optical Brightener (OB-1)


    Jinan Finer Chemical Co., Ltd
    https://www.finerchem.com › products › detail
    Jinan Finer Chemical Co., Ltd
    https://www.finerchem.com › products › detail
    Dive Deeper
    Factory Supply industrial standard Optical Brightener (OB-1) 1533-45-5 In Stock. Molecular Formula:C28H18N2O2; Molecular Weight:414.463; Appearance ...Read more

    Eastobrite OB-1, Optical Brightener OB-1, CAS 1533-45-5 ...


    opticalwhitener.com
    https://opticalwhitener.com › uploads › 2020/02
    opticalwhitener.com
    https://opticalwhitener.com › uploads › 2020/02
    PDF
    Dive Deeper
    optical brightener ob-1 is an universal plastic OBA. excellent brightening ability, good thermal stability, and compatibility with many polymers. Specifications ...Read more
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