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    Related: Flame Retardant Additive Zinc Borate APP
    • PSPPP Polysulfonyl Phenyl Phenylene Phosphonate CAS 35398-70-0

    PSPPP Polysulfonyl Phenyl Phenylene Phosphonate CAS 35398-70-0

    Polysulfonyl Phenyl Phenylene Phosphonate, recognized by CAS 35398-70-0, is a high-performance polymeric additive characterized by its dual-element phosphorus-sulfur synergistic flame retardant mechanism. As a specialized polysulfonyl phenyl phenylene phosphonate, this technical-grade additive functions as a non-halogenated char-forming agent in high-temperature polymer flame retardancy processes. This heat-resistant phenylene phosphonate polymer is specifically engineered for high-performance engineering plastics, providing excellent thermal stability and melt-dripping resistance without compromising the mechanical integrity of the base resin. Our facility provides competitive factory pricing and customized specifications for this material to ensure optimal dispersion within various thermoplastic matrices. For regulatory compliance and technical validation, we offer comprehensive MSDS, TDS, COA documentation and maintain consistent bulk supply for industrial-scale manufacturing.

    • CAS: 35398-70-0
    • Synonyms: PSPPP, Poly(sulfonyl phenyl phenylene phosphonate), Phosphorus-sulfur polymer flame retardant, Polymeric phenyl phosphonate
    • Molecular Formula: (C18H13O5PS)n
    • Grade: Fiber Grade / Engineering Plastic Grade
    • Package: 25kg/Paper Bag (lined with PE) or 500kg/Super Sack.
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    Product Description

    PSPPP acts as a polymeric additive that functions primarily in the condensed phase. When exposed to fire, it promotes carbonization (char formation), creating a barrier that prevents heat transfer and oxygen diffusion.

    Core Advantages:

    1. High Thermal Stability: With a decomposition temperature exceeding 350°C, it withstands the harsh processing conditions of spinning and injection molding.
    2. Excellent Compatibility: Being a polymer, it blends seamlessly with PET and PA matrices, preventing migration or “blooming” on the surface.
    3. Spinnability: Ideal for fiber production. It does not clog spinnerets or cause wire breakage during high-speed spinning.
    4. Eco-Friendly: Free from Bromine and Chlorine; meets RoHS and REACH requirements.
    1 Physicochemical Properties
    2 Applications
    3 Storage Conditions
    4 Safety Precautions

    Physicochemical Properties

    The table below represents typical specifications for Export Grade PSPPP.

    ParameterSpecification (Standard)
    AppearanceLight yellow to amber glassy solid or flakes
    Phosphorus Content (P)6.0% – 7.5%
    Sulfur Content (S)10.0% – 13.0%
    Softening Point130°C – 160°C
    Decomposition Temp (5% wt loss)≥ 380°C
    Moisture / Volatile Matter≤ 0.5%
    Acid Value (mg KOH/g)≤ 2.0
    Density (25°C)~ 1.4 g/cm³
    SolubilityInsoluble in water; Soluble in warm THF or DMF

    Applications

    1. Synthetic Fibers (PET & PA):
      • Widely used in polyester filament, staple fiber, and nylon spinning. It imparts permanent flame retardancy suitable for textiles, curtains, and automotive upholstery.
      • Recommended dosage: 5% – 10% (depending on LOI requirements).
    2. Engineering Plastics:
      • Used in PBT, PET, and Polyamide (Nylon 6, Nylon 66) injection molding parts.
      • Ideal for electrical connectors and electronic components requiring high heat resistance.
    3. Films and Sheets:
      • Used in manufacturing flame-retardant polyester films.

    For related phosphorus- and zinc-based flame-retardant additives, see Ammonium Polyphosphate (APP) and Zinc Borate.

    Storage Conditions

    • Environment: Store in a cool, dry, and well-ventilated area.
    • Moisture Control: The product is stable but should be kept away from moisture to ensure optimal processing performance. Reseal bags immediately after use.
    • Temperature: Keep away from direct sunlight and heat sources.
    • Shelf Life: 24 months in original unopened packaging.

    Safety Precautions

    • Handling: Wear dust masks and safety goggles to prevent dust inhalation and eye contact. Use with local exhaust ventilation during thermal processing.
    • Toxicity: Considered low toxicity. Not classified as a dangerous good for transport.
    • Thermal Processing: Ensure the processing temperature does not exceed the decomposition limit to avoid the release of fumes.
    • First Aid:
      • Skin: Wash with soap and water.
      • Eyes: Rinse with water for 15 minutes.

    FAQ - Technical & Supply Chain

    • Q:

      What is PSPPP Polysulfonyl Phenyl Phenylene Phosphonate CAS 35398-70-0?

      A: PSPPP CAS 35398-70-0 is a phosphorus-sulfur polymeric flame retardant used mainly in fiber and engineering plastics. It is also called poly(bisphenol sulfone phenyl phosphonate) or poly(phenylphosphonate diphenyl sulfone ester) and is designed for halogen-free flame-retardant systems.
    • Q:

      How does PSPPP work as a flame retardant?

      A: PSPPP works mainly in the condensed phase by promoting carbonization during combustion. The resulting char layer blocks heat transfer and reduces oxygen diffusion, helping the polymer matrix resist flame spread.
    • Q:

      Why is PSPPP suitable for PET and PA fiber-grade applications?

      A: Its high thermal stability and polymeric structure allow it to survive high-temperature spinning and injection molding. PSPPP is designed to blend with PET and PA while minimizing migration, blooming, spinneret clogging, and wire breakage during fiber production.
    • Q:

      Is PSPPP suitable for halogen-free flame retardant formulations?

      A: Yes, PSPPP is a bromine-free and chlorine-free polymeric additive for HFFR systems. It supports char formation in engineering plastics and is positioned for applications requiring RoHS and REACH-oriented material choices.
    • Q:

      What are typical specifications for PSPPP export grade?

      A: The export grade is usually a light yellow to amber glassy solid or flakes with phosphorus content about 6.0-7.5%, sulfur content about 10.0-13.0%, softening point about 130-160 deg C, decomposition temperature at 5% weight loss at least 380 deg C, and density about 1.4 g/cm3.

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