optical brihgteners for paints coatings inks
FAQ of optical brighteners

optical brighteners OB for paints and coatings

The optical brighteners OB, also known as fluorescent whitening agent (FWA), fluorescent brightening agent (FBA), or optical brightening agent (OBA), is a kind of fluorescent dye or white dye, which is widely used for the whitening and brightening of plastics, paints, coatings, inks, etc.


The working principle of optical brighteners is to absorb the invisible UV light and remit the visible blue light to offset the yellow of the substance.

Specific of optical brighteners OB

  • Trade name: optical brighteners OB
  • Alternative: Tinopal OB, Uvitex OB, Hunstman OB, etc.
  • C. I. No.: 184
  • CAS No.: 7128-64-5
  • Chemical Name: 2,5′-Bis[2-(5-tert-buty l-2 benzoxazoly)thiophene
  • Molecular Formula C26H26N2O2N2
  • Molecular Weight 430
  • Technical Index Appearance: slight greenish-yellow powder
  • Melting Point:200-202°C
  • Purity:≥99%
  • Uses Mainly be used in whitening of thermoplastic, polyvinyl chloride(PVC), polypropylene(PP), polyester fiber, paint, ink, etc.


The features of our optical brighteners OB in painting and coatings.

1.  Easy to dissolve in common organic solvents at room temperature. (Xylene, toluene, methanol, acetone, etc)

2. Easy to use, just add them with other colorants or additives during production and stir evenly.

3. Good transparency and weather resistance. it will improve the transparency of transparent paints and it’s blue light will add brilliance to all colors. 

4. Low dosage. 200 grams in 1tons of paint can add 10 whiteness values. 5. Our OB has passed the Rohs test and SVHC screening report by SGS, which is an environment-friendly material for paints and coatings. 

Shandong Grand Chemical Co., Ltd serves decades of large and medium size of coating and paint manufacturers all over the world with rich experience.

If you would like to know more about the optical brighteners OB, please do not hesitate to drop us an<a href=”mailto:catherine@obachemical.com”>inquiry</a>

optical brighteners for paints and coatings.