Hydroxyl-terminated Phenyl Silsesquioxane (YS-700) is a state-of-the-art, silicone-based resin designed to enable the development of next-generation, high-performance flame retardant (FR) polymer systems. As a multi-functional additive, YS-700 goes beyond simple flame retardancy, delivering significant improvements in durability, processing, and environmental profile.
Superior Flame Retardancy: A Condensed-Phase Mechanism
YS-700 functions as a powerful condensed-phase synergist, creating a robust protective shield on the polymer’s surface during a fire.
• Ceramic Char Armor: Upon exposure to heat, YS-700 decomposes to form a hard, stable, and continuous ceramic-like silica (SiO2) layer. This shield acts as an excellent thermal insulator, reinforcing the carbonaceous char formed by the primary FR or the polymer itself.
• Elite Anti-Dripping Performance: At high temperatures, the hydroxyl groups on the YS-700 molecules cross-link, forming a three-dimensional network within the polymer melt. This dramatically increases melt viscosity and strength, effectively eliminating the formation of flaming drips—a critical factor for achieving a UL 94 V-0 rating in demanding applications.
More Than a Flame Retardant: Key Multi-Functional Benefits
YS-700 is a value-adding solution that enhances the overall performance of your final product.
Enhanced Durability & Weatherability
The unique silicone-phenyl structure provides inherent, long-term resistance to environmental degradation. The strong Si-O backbone resists thermal and UV breakdown, while the phenyl groups act as built-in UV absorbers, protecting the polymer matrix from yellowing and embrittlement.
Outstanding Processability
• Excellent Dispersion: With a low softening point (approx. 140-150°C), the YS-700 resin melts during compounding, ensuring homogeneous, molecular-level dispersion.
• Improved Melt Flow: In highly-filled systems (e.g., HFFR cables), YS-700 acts as an internal lubricant, which can lower melt viscosity, leading to a smoother, more stable extrusion process and higher throughput.
Advanced Environmental Profile
YS-700 enables formulations that meet the strictest global standards. It is a key component for creating systems that are:
• Halogen-Free
• Antimony-Free
• PFAS-Free
Excellent Optical Properties
YS-700 possesses a high refractive index (>1.5), closely matching that of polymers like Polycarbonate (PC). This allows for the formulation of highly transparent flame-retardant parts with minimal impact on clarity or haze.
Target Applications
YS-700 is the ideal synergist for demanding applications in:
• Engineering Plastics (PC, PC/ABS, PA, PBT): For thin-walled electronics connectors, EV battery components, and high-performance automotive parts.
• Halogen-Free Wire & Cable (HFFR): In TPU, TPE, XLPE, and Silicone Rubber compounds to enhance char integrity and achieve ceramification.
• High-Performance Coatings: As a co-binder to provide exceptional long-term weatherability and fire resistance.
• Optical Materials: For LED encapsulants and transparent FR sheets, leveraging its thermal stability and high refractive index.
