Bisphenol A-bis(diphenyl phosphate) (BDP)

Bisphenol A-bis(diphenyl phosphate) (BDP) (CAS No. 5945-33-5):

1. Basic Information 

- Chemical Name: 

- Bisphenol A bis(diphenyl phosphate) (IUPAC) 

- Abbreviations: BDP or BAPP 

- CAS Number: 5945-33-5 

- Molecular Formula: C₃₉H₃₄O₈P₂ 

- Molecular Weight: ~692 g/mol 

- Appearance: White to light yellow powder or flakes 

2. Applications 

BDP is a highly effective organophosphate flame retardant (OPFR) widely used in: 

 (1) Electronics & Electrical Equipment 

- Printed Circuit Boards (PCBs): Flame retardant for epoxy resin substrates (meets UL 94 V-0 standard). 

- Electronic Housings: Laptop/phone casings (PC/ABS blends), connectors. Wire & Cable Insulation: Prevents flame propagation in PVC/PE coatings. 

 (2) Automotive Industry 

- Interior Components: Dashboard panels, seat foams (complies with FMVSS 302). 

- EV Battery Systems: Battery casings and high-voltage components. 

 (3) Construction Materials 

- Fireproof Coatings: For steel structures and tunnel linings. 

- Thermal Insulation Foams: Polyurethane (PU) and polystyrene (EPS) foams. 

 (4) Aerospace & Transportation 

- Aircraft seat cushions and interior panels (FAR 25.853 compliant). 

3. Technical Advantages 

- Excellent Compatibility: Disperses well in polymers (PC, ABS, PET, etc.). 

- Low Volatility/Migration: Enhances product longevity. 

- Dual-Phase Flame Retardancy: 

- Gas Phase: Releases PO· radicals to quench flames. 

- Condensed Phase: Promotes char formation as a thermal barrier. 

4. Safety & Regulatory Notes 

- Toxicity Concerns: 

 - Potential degradation to diphenyl phosphate (DPP) – an endocrine disruptor. 

 - May emit phenols/phosphorus oxides at >300°C. 

- Regulatory Status: 

 - EU: Under REACH evaluation; restricted in some applications. 

 - China: Permitted but monitored under GB standards. 

- Alternatives: 

 - Halogen-free options (e.g., aluminum diethylphosphinate, RDP). 

5. Frequently Asked Questions 

Q1: Is CAS 5945-33-5 identical to 181028-79-5? 

- Likely the same compound with minor registration variations (e.g., isomerism/purity). Confirm with supplier data. 

Q2: What is BDP’s thermal stability? 

- Stable up to ~300°C; avoid higher temperatures to prevent decomposition. 

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