Optical Brightener OB-1
Optical Brightener OB-1 is supplied by Shandong Grand Chemical for PET, nylon, PP, ABS, PS. C.I. 393. CAS 1533-45-5. 2,2'-(4,4'-Distyryl)bisbenzoxazole. Use the specification table below; figures that are not printed on the source product page are marked TBC or omitted.
Specification
| C.I. No. | 393 |
|---|---|
| CAS | 1533-45-5 |
| Molecular formula | C28H18N2O2 |
| Formula weight | 414.45 |
| Melting point | 355–360 °C |
| Purity | 98.50% |
| Heat resistance | 375–400 °C |
| Appearance | Yellow-green powder |
| Ionicity | Non-ionic |
| Shade | Brilliant bluish white |
| Dosage (source) | A few parts per ten thousand in plastics. Overdose yellows the part. |
| Packing | 25 kg fiber drum |
| Synonyms on source page | Uvitex OB-1, Eastobrite OB-1, OBA 393 |
What this grade is for
- High melt point for PET, nylon and engineering plastics.
- FDA / RoHS / SVHC wording on the category page covers OB-1.
- Application notes use OB-1 for rigid PVC and high-temperature recycled PE/PP/PS/ABS.
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-1 used for?
Optical Brightener OB-1 is listed for PET, nylon, PP, ABS, PS, HIPS, PA, PC, EVA, rigid PVC.
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.
