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HF-691A is a halogen-free silicon-based flame retardant synergist with nano-scale particle size.
HF-691A is a halogen-free silicon-based flame retardant synergist with nano-scale particle size. When
used together with hydroxide flame retardants, phosphorus-nitrogen flame retardants and other systems, it
can boost char-forming capacity and char layer strength, thereby isolating heat sources and oxygen, reducing
heat release and smoke density, improving flame retardancy, and restraining melt dripping during combustion.
| Appearance | Average particle size | Water solubility | Water content | True Density | pH | Bulk density | Decomposition temperature | Phosphorus content | Nitrogen content | Cr, Cd, Pb, Hg, As | Whiteness |
| off-white color | ≤5 μm | ≤0.5 g/100ml | ≤0.5 % | / | / | / | / | / | / | / | ≥92 % |
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