Optical Brightener OB
Optical Brightener OB is supplied by Shandong Grand Chemical for PVC, PS, ABS, PP, PE. C.I. 184. CAS 7128-64-5. 2,5-Bis[2-(5-tert-butyl-2-benzoxazolyl)]thiophene. Use the specification table below; figures that are not printed on the source product page are marked TBC or omitted.
Specification
| C.I. No. | 184 |
|---|---|
| CAS | 7128-64-5 |
| Molecular formula | C26H26N2O2S |
| Formula weight | 430 |
| Melting point | 201.1–202.2 °C |
| Purity | 99.80% |
| Appearance | Yellowish-green powder |
| Ionicity | Non-ionic |
| Shade | Blue-violet fluorescence |
| Dosage (source) | Paints article on this site cites about 200 g per ton of paint. Plastics are typically dosed at a few parts per ten thousand. |
| Packing | 25 kg fiber drum |
| Synonyms on source page | Tinopal OB, Uvitex OB, Whitex NSK, OB-C, OB-P, FBA 184 |
What this grade is for
- Whitening of PVC, PS, ABS, PP, PE and oil-based paints and coatings.
- FDA 21 CFR §178.3297 / RoHS 2015/863 / SVHC language on the optical-brightener category page applies to OB.
- Application notes use OB for transparent and flexible PVC and films.
FDA 21 CFR §178.3297 Colorants for polymers: in all polymers at levels not to exceed 0.015 percent by weight of the polymer. Finished articles may contact food only under conditions of use A through H described in Table 2 of §176.170(c). Optical Brightener OB and OB-1 offered by Shandong Grand Chemical comply with RoHS directive (EU) 2015/863 and passed SVHC screening by ECHA on or before 5 June 2020. REACH registration: 10–100 MT of OB and OB-1 to European countries.
Questions we actually get
What is OB used for?
Optical Brightener OB is listed for PVC, PS, ABS, PP, PE, oil-based paints and coatings, inks.
Do you publish a price?
No. The live catalog does not list prices. Ask for a quote with your polymer or fiber, process temperature and monthly volume.
Can I get TDS / COA / SDS?
Yes — request the current document set by WhatsApp or email. This site does not host downloadable PDFs because the source site does not publish a document library.
