![Flame Retardant DOPO-HQ (2-(6-Oxido-6H-dibenz[c,e][1,2]oxaphosphorin-6-yl)-1,4-benzenediol)](/assets/images/product-dopo-hq.jpg)
Flame Retardants
Flame Retardant DOPO-HQ
2-(6-Oxido-6H-dibenz[c,e][1,2]oxaphosphorin-6-yl)-1,4-benzenediol
Reactive DOPO derivative with twin hydroxyl groups for polyester and PU chains.
Product Description
DOPO-HQ (also referenced as ODOPB) is the addition product of DOPO with benzoquinone, featuring two phenolic hydroxyl groups flanking the DOPO cage. These twin functionalities allow it to react directly into polyester, polyurethane, epoxy and phenolic chains as a diol-type monomer.
In chemically recycled or copolyester fibers and films, DOPO-HQ incorporation delivers permanent, non-migrating flame retardancy with UV stability far superior to brominated additives. PPSU-style modified PPE, high-temperature polyamides and reactive epoxy systems likewise reach UL 94 V-0 with minimal loading penalty.
Aolong DOPO-HQ is produced to ≥98.5% purity with white powder appearance and controlled melting range, supporting demanding polyester polycondensation processes at up to 250 °C.
Key Features
- Dual hydroxyl reactivity — built into polymer chains
- Permanent, non-migrating flame retardancy
- Excellent UV stability versus brominated systems
- Thermally stable to 250 °C polycondensation
Applications
- Flame-retardant polyester fibers and films
- Reactive FR for epoxy and phenolic resins
- Polyurethane rigid foams and elastomers
- High-temperature polyamide and PPE systems
- Electronics-grade laminating resins
Specifications
| CAS No. | 99208-50-1 |
|---|---|
| Molecular Formula | C18H13O4P |
| Molecular Weight | 324.27 |
| Appearance | White to off-white powder |
| Assay (HPLC) | ≥ 98.5% |
| Melting Point | 245 – 255 °C |
| Phosphorus Content | 9.5% |
Packaging & Storage
25 kg fiber drum with PE liner, 1 kg aluminum-foil sample bag. Store cool and dry; shelf life 24 months in original sealed packaging.
Related Products
Need a custom additive solution?
Send us your technical requirements — our engineers will reply with product recommendations, TDS documents and a competitive quotation within 24 hours.