Polyphenylene Oxide (PPO) possesses an oxygen index of approximately 29–32, indicating inherent flame-retardant properties. It is commonly used in high-temperature electrical components, insulating materials, and automotive applications. To meet more stringent flame-retardancy standards, flame-retardant modification is necessary. The following formulation utilizes a synergistic "phosphorus-silicon" system to enhance the flame-retardant rating and improve thermal stability:

PPO: 80–89%

SFR-Si907 (Silicone Synergist): 0.5–1.0%

Phosphorus-Silicon Flame Retardant: 5–12%

Toughening Agent (e.g., USI-3401): 3–5%

Processing Aid (e.g., SI-T8): 3–5%

Lubricant & Antioxidant: 0.1–0.5% each

Note: The actual formulation should be adjusted based on specific application requirements, regulatory restrictions, and processing conditions. Small-scale sample testing and evaluation are strongly recommended.

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