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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

    PSPPP Polysulfonyl Phenyl Phenylene Phosphonate, CAS 35398-70-0, is a phosphorus-sulfur polymeric flame retardant supplied for fiber and engineering-plastic halogen-free applications. Confirm the required grade and specification, then request a quotation with COA/TDS/SDS for bulk supply.

    • 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, CAS 35398-70-0, is a phosphorus-sulfur polymeric flame retardant used mainly in fiber and engineering plastics.

    Synonyms: PSPPP; Poly(sulfonyl phenyl phenylene phosphonate); Phosphorus-sulfur polymer flame retardant; Polymeric phenyl phosphonate.

    CAS: 35398-70-0.

    It has the repeating-unit formula (C18H13O5PS)n.

    It appears as a light yellow to amber glassy solid or flakes.

    It has a phosphorus content of about 6.0–7.5% and sulfur content of about 10.0–13.0%.

    It works in the condensed phase by promoting char formation during combustion.

    The char layer blocks heat transfer and reduces oxygen diffusion, resisting flame spread.

    It is bromine-free and chlorine-free and supports halogen-free flame-retardant systems.

    Its high thermal stability allows it to survive high-temperature spinning and injection molding.

    It is designed to blend with PET and PA with minimal migration, blooming and spinneret clogging.

    It is used in polyester filament, staple fiber and nylon spinning at typically 5–10%.

    It is used in PBT, PET and polyamide injection-molding parts for electrical applications.

    It is suitable for RoHS- and REACH-oriented material choices.

    Confirm appearance, phosphorus content, sulfur content, softening point, decomposition temperature, moisture, acid value, density and solubility.

    Store sealed in a cool, dry, well-ventilated place, away from moisture and direct sunlight.

    Confirm packaging with the requested quantity and destination requirements.

    The page is an RFQ entry point and does not state stock, price, MOQ or fixed lead time.

    For an RFQ, state the intended use, required grade and specification, quantity, packaging, destination and document needs.

    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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