![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
Flame Retardants
Flame Retardant DOPO
9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide
The leading reactive phosphorus intermediate for halogen-free epoxy and electronics.
Product Description
DOPO is a bicyclic phosphorus heterocycle that reacts into polymer chains through its P–H bond rather than remaining as an additive. This reactive incorporation is its decisive advantage: the flame retardant element becomes part of the molecular structure, eliminating migration, blooming and plasticization while maximizing hydrolytic stability.
Its primary application is halogen-free epoxy resins for copper-clad laminates (CCL) in printed circuit boards. DOPO-modified epoxy novolacs achieve UL 94 V-0 ratings at phosphorus contents of just 2–3%, while preserving glass transition temperatures and electrical performance that additive FRs would destroy.
Aolong DOPO is synthesized to ≥99.0% purity (titration + HPLC) with white flake appearance and controlled hydrolyzable chlorine, ensuring clean reactivity in high-value electronics resin systems.
Key Features
- Reactive type — no migration, blooming or plasticization
- Enables UL 94 V-0 at only 2–3% phosphorus content
- Preserves Tg and electrical properties of epoxy systems
- ≥99% purity with low hydrolyzable chlorine
Applications
- Halogen-free copper-clad laminates (CCL)
- Flame-retardant epoxy encapsulants and underfills
- Reactive FR for polyesters and polyurethanes
- Intermediate for DOPO-HQ, DOPO-ITA and derivatives
- Electronic conformal coatings
Specifications
| CAS No. | 35948-25-5 |
|---|---|
| Molecular Formula | C12H9O2P |
| Molecular Weight | 216.17 |
| Appearance | White crystalline flakes / powder |
| Assay | ≥ 99.0% |
| Melting Point | 117 – 120 °C |
| Phosphorus Content | 14.3% |
| Hydrolyzable Chlorine | ≤ 200 ppm |
Packaging & Storage
25 kg fiber drum with PE liner, 1 kg aluminum-foil sample bag. Store cool, dry, nitrogen-flushed on request; shelf life 24 months in original sealed packaging.
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