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Phosphorus-based reactive flame retardant offering excellent thermal stability and low volatility.
Halogen-free formulation compliant with RoHS, REACH, and UL 94 V-0 standards for enhanced environmental and regulatory safety.
High phosphorus content (≥18.5 wt%) enabling efficient char formation and gas-phase flame inhibition.
Good compatibility with epoxy resins, particularly in high-performance printed circuit board (PCB) laminates.
Minimal impact on glass transition temperature (Tg) and mechanical properties of cured resin systems.
FR-4 and high-Tg epoxy-based printed circuit board (PCB) laminates.
Advanced packaging substrates requiring halogen-free compliance and high reliability.
LED encapsulation materials and electronic encapsulants demanding low smoke and low toxicity.
Electric vehicle (EV) battery module housings and insulation components.
Industrial control and 5G communication infrastructure boards operating under stringent flammability requirements.
| Chemical Type | Reactive organophosphorus compound (Resorcinol bis(diphenyl phosphate)) |
| Product Form | White to off-white crystalline powder |
| Appearance | Free-flowing granular solid |
| Phosphorus Content | ≥18.5 wt% |
| Melting Point | 85–95 °C |
| Decomposition Onset Temperature (TGA, N₂) | ≥280 °C |
| Solubility | Freely soluble in common epoxy diluents; compatible with DGEBA-type resins |
| Halogen Content | Non-detectable (<5 ppm by GC-MS) |
Q1: What is the primary chemical composition of CR-733S?
A: CR-733S is based on resorcinol bis(diphenyl phosphate) (RDP), a phosphorus-containing aromatic organophosphate widely recognized for its halogen-free flame-retardant performance in thermoplastics and engineering resins.
Q2: In which polymer systems is CR-733S most commonly used?
A: CR-733S demonstrates excellent compatibility and processing stability in polycarbonate (PC), PC/ABS blends, polyesters (e.g., PET, PBT), and certain polyamide formulations—particularly where low volatility, good hydrolytic stability, and minimal impact on mechanical properties are required.
Q3: How does CR-733S achieve flame retardancy without halogens?
A: It functions primarily through condensed-phase action—promoting char formation on the polymer surface—and gas-phase radical quenching via phosphorus-containing volatile species generated during thermal decomposition. This dual mechanism helps meet stringent fire safety standards while avoiding halogen-related environmental and corrosion concerns.
Q4: Is CR-733S suitable for applications requiring regulatory compliance with RoHS, REACH, or similar frameworks?
A: Yes—CR-733S contains no intentionally added halogens, heavy metals, or substances currently restricted under RoHS Directive or REACH Annex XIV/XVII. Its formulation aligns with industry expectations for halogen-free, eco-conscious flame retardancy, though final compliance must be verified per end-product configuration and regional requirements.
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