Sinophor® OB-1 / Optical brightener OB-1 CAS 1533-45-5

Optical brightener OB-1 

Chemical Name: Optical brightener OB-1

Other Name: Fluorescent Brightener 393 ; 4,4′-Bis(2-benzoxazolyl)stilbene ; Fluorescent brightener OB-1

CAS No.: 1533-45-5

Molecular Formula: C28H18N2O2

Molecular weight: 414.45

Optical brightener OB-1 Structure:

Optical brightener OB-1 Structure

Appearance: Yellow greenish powder

Assay: 99%


Optical brightener OB-1 Typical Properties

Item Specifications
Appearance Slight greenish yellow powder
Content (HPLC) 98~98.5%
Melting point 352~358℃
Ash content ≦0.5%
Volatile matter ≦0.5%

What is the difference between Optical brightener OB and Optical brightener OB-1?

Optical brightener OB and Optical brightener OB-1 are completely different chemicals, You can click the link above to see the differences.

Optical brightener OB-1 Usage

1. Optical Brightener OB-1 can be used for whitening polyester fiber, nylon fiber and polypropylene fiber.

2. Optical Brightener OB-1 can be used to whiten polypropylene plastic, rigid PVC, ABS, EVA, polystyrene and Makrolon.

3. Optical Brightener OB-1 can be used for polyester and nylon.

4. Optical brightener OB-1 can also be used for whitening plastics such as ABS, PS, HIPS, PA, PC, PP, EVA and rigid PVC. The addition of OB-1 to nylon fiber, nylon and polyester will also significantly improve the whitening degree.

5. Optical brightener OB-1 adds OB-1 to recycled polyester fiber waste, bottle material and chips, the recycled material will appear whiter, and the chromaticity of different recycled materials will become more consistent.

Optical brightener OB-1 Features

1. high whitening strength and strong fluorescence.

2. wide application scope: polyester, nylon fiber and various plastics.

3. Optical brightener OB-1 is particularly resistant to high temperatures, and is mainly used for whitening by hot-melt pad dyeing, suitable for whitening polyester fibers and whitening polyester, cotton and other fiber blended fabrics.

4. Optical brightener OB-1 is an excellent oxazole brightener, insoluble in water, stable in performance, and has good resistance to sunlight, chlorine bleaching and migration.

Optical brightener OB-1 Application method

Recommended dosage: for each 1000 kg material
1.EVA, polypropylene fiber, nylon and Makrolon: 75~200g
2.polyster fiber: 75~300g

Optical brightener OB-1 Packaging and Shipping

Packaging according to customer requirements (25 kg) cartons, paper bucket, paper bags. Packaging according to customer requirements. Dry, dark save.


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Why do sponge products turn yellow? What is the solution?
Sponge products may turn yellow during use for various reasons. Here are a few possible reasons:

1, Oxidation: when the materials in sponge products come into contact with oxygen, an oxidation reaction may occur, causing the sponge to turn yellow. This is usually due to the polymer material in the sponge reacting with oxygen in the air, resulting in a change in colour.

2, Dirt and contaminants: Sponge products are usually used for cleaning and wiping surfaces, and therefore come into contact with a variety of dirt and contaminants. This dirt can penetrate the fibres of the sponge and is difficult to clean completely. Over time, dirt can accumulate and cause the sponge to turn yellow.

3, sunlight and UV exposure: when sponge products are exposed to sunlight or UV radiation for a long period of time, certain components in the material may undergo a photochemical reaction. This reaction may lead to changes in the molecular structure, making the sponge yellow.

4, chemical reaction: some sponge products may be sensitive to specific chemicals, and its contact may react to cause yellowing. These chemicals may include detergents, bleach, dyes or other chemicals.

5, improper storage and maintenance: If the sponge products are not properly stored and maintained, such as long exposure to moisture, or stored with other coloured substances, it may lead to yellowing of the sponge.

It should be noted that the yellowing of sponge products does not necessarily mean that their performance or function has been impaired, but it may affect the appearance. If you want to maintain the original colour of sponge products, you should clean and maintain them regularly and avoid contact with substances that may cause yellowing.


Solution: You can prevent sponges from yellowing by using a sponge anti-yellowing agent, which is a product that can help maintain the colour of the sponge:

1, choose the right sponge anti-yellowing agent: there are different types of sponge anti-yellowing agent available on the market. Ensure that you choose the appropriate product for your sponge type and application. Read product descriptions and guidelines for applicable conditions and usage.

2, Pre-treatment of sponges: Sponges can be pre-treated before they are used. Soak the sponge in warm water mixed with an appropriate amount of sponge anti-yellowing agent for the amount of time indicated in the product instructions. Pre-treatment can help prevent the sponge from turning yellow in advance.

3, Regular Cleaning and Maintenance: Regular cleaning of the sponge is an important step in preventing yellowing. Use warm water and a mild detergent to thoroughly clean the surface and fibres of the sponge. Avoid cleaning agents containing bleach or strong acids and alkalis, which may damage the colour and texture of the sponge.

4, avoid pollutants and chemicals: Try to avoid sponges coming into contact with pollutants and chemicals that may cause yellowing. Avoid using the sponge to clean items containing strong pigments or dyes. Also, avoid contact between the sponge and items containing bleach or other harmful chemicals.

5, Proper Storage: Store sponges in a dry, well-ventilated area away from direct sunlight. Avoid exposing the sponge to humidity to prevent mould and yellowing.

6, Replace the sponge regularly: No matter how careful maintenance measures are taken, the sponge will wear out and become old over time. Regularly check the condition of your sponges and replace those that need replacing in a timely manner to keep them clean and looking good.

Please note that the use of sponge anti-yellowing agents does not completely eliminate the possibility of sponge yellowing, but it can effectively delay the onset of yellowing. Also, ensure that you select and use the sponge anti-yellowing agent correctly and follow the product instructions.

2 reviews for Sinophor® OB-1 / Optical brightener OB-1 CAS 1533-45-5


    Thank you very much for your suggestion, Dear Clayton, we will try to change the new wording.

  2. bokep indo

    Takes care of your requirement.
    Very professional.

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