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    HomeProductsBasic & Fine ChemicalsFine ChemicalsPolyethyleneimine (PEI) CAS 9002‑98‑6
    • Polyethyleneimine (PEI) CAS 9002‑98‑6
    • Polyethyleneimine (PEI) CAS 9002‑98‑6
    • Polyethyleneimine (PEI) CAS 9002‑98‑6
    • Polyethyleneimine (PEI) CAS 9002‑98‑6

    Polyethyleneimine (PEI) CAS 9002‑98‑6

    Polyethyleneimine (PEI) is a synthetic polyamine composed of repeating ethyleneimine units, forming a polymeric structure rich in amine functionalities. As a defined polymer class, Polyethyleneimine (CAS 9002‑98‑6) is supplied through professional chemical supply chains for regulated industrial and research environments, where accurate material identification and documentation are required. The CAS number represents the polymer category as a whole rather than a single molecular species, consistent with standard chemical registry practices for polymers.
    Polyethyleneimine is provided with standardized specifications and comprehensive documentation, including MSDS, TDS, and COA, supporting regulatory compliance and traceability.

    • CAS: 9002-98-6
    • Synonyms: Polyethyleneimine, PEI polymer, Poly(ethylene imine), Ethyleneimine polymer
    • Einecs: 618‑346‑2
    • Molecular Formula: C₂H₅N
    • Grade: Industrial grade 99%
    • Package: 200kg iron drum or 50kg plastic drum packaging
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    Product Description

    1 Physicochemical properties
    2 Application Areas
    3 Storage conditions
    4 Safety precautions

    Physicochemical properties

    PropertyValue
    IUPAC NamePolyethyleneimine
    SynonymsPolyethylenimine, PEI, Poly(etherimide) (in some contexts, but note the distinction), Branched Polyethyleneimine, Linear Polyethyleneimine (depending on structure)
    CAS Number9002-98-6
    Molecular FormulaC₂H₅N
    Molecular WeightVariable, ranging from low molecular weight (e.g., 600 g/mol) to high molecular weight (e.g., 25,000 g/mol or more)
    AppearanceWhite to pale yellow solid (in powder or granule form) or viscous liquid (depending on molecular weight and concentration)
    SolubilityHighly soluble in water; soluble in some organic solvents (e.g., ethanol)
    pH (5% aqueous solution)8–11
    DensityApproximately 1.030 g/mL at 25 °C (for some forms)
    Boiling PointAround 250 °C (lit.) (for some forms)
    Melting Point59–60 °C (for some forms)
    Flash Point>230 °F (>110 °C) (for some forms)
    Refractive Indexn20/D 1.5290 (for some forms)
    Chemical StructureComposed of ethyleneimine units (CH₂-CH₂-NH); contains primary, secondary, and tertiary amine groups, giving it high cationic character
    ReactivityHighly reactive; can react with cellulose hydroxyl groups to form cross-linked polymers; can form amides, esters, and amine salts with various compounds
    StabilityUnstable at room temperature and pressure; should be stored away from moisture, heat, and high temperatures; avoid contact with strong oxidizers or acidic substances
    ToxicityExhibits cytotoxicity, especially at high molecular weights; requires careful handling and control of residues in pharmaceutical applications

    Application Areas

    Biopharmaceuticals: used as gene delivery vectors for gene therapy and vaccine development.
    Materials Science: Used for nanotechnology, surface modification, and functional coatings.
    Water treatment: used as a sewage treatment purification agent and solid precipitant.
    Industrial sector:
    Paper industry: as a flocculant, retention agent, and surface sizing agent.
    Metal protection: used as a corrosion inhibitor.

    Storage conditions

    Conventional conditions: Store in a dark, cool, and well ventilated place, sealed. It is recommended to store at a temperature of 5-35 ℃ and a humidity of ≤ 70%.
    Special requirements: Keep away from sources of fire, heat, and strong oxidizing substances. Adopting anti-static packaging to prevent moisture or deterioration.

    Safety precautions

    Health hazards: May be irritating to the skin and eyes, anti-static gloves, goggles, and KN95 masks should be worn during operation.
    Environmental risk: In case of leakage, it is necessary to isolate the contaminated area and professionally dispose of it by adsorbing it with sand.
    Explosion risk: Non flammable, but avoid contact with oxidants

    FAQ - Technical & Supply Chain

    • Q:

      Does CAS 9002‑98‑6 correspond specifically to polyethyleneimine?

      A: Yes. CAS 9002‑98‑6 is assigned to polyethyleneimine as a polymeric material class.
    • Q:

      Does this CAS number define a specific molecular weight of PEI?

      A: No. CAS 9002‑98‑6 identifies polyethyleneimine as a polymer category; molecular weight and structural variations are not specified by the CAS number.
    Documents

    Documents and Product Support

    For product review and sourcing evaluation, supporting documents can be coordinated according to the product type, inquiry stage, and order requirements.

    • COA for batch-based quality reference
    • TDS for key physical and chemical information
    • SDS / MSDS for handling, storage, and safety reference
    • Packing information for sample, trial, and bulk orders
    • Technical communication based on application and specification requirements
    Quotation

    Information to Confirm Before Quotation

    Clear sourcing information helps reduce specification mismatch and allows a more accurate quotation before sample or bulk order discussion.

    • Product name and CAS number
    • Application or intended end use
    • Required purity, grade, or specification
    • Sample quantity, trial order, or bulk demand
    • Preferred packing form or net weight
    • Destination country or port
    • Required documents or compliance expectations
    Storage & Handling

    Packaging, Storage, and Handling Notes

    Packaging form, storage conditions, shelf life, and shipment arrangements should be confirmed according to the product characteristics, package size, and destination requirements.

    Before order confirmation, buyers are advised to review the corresponding product documents and confirm whether any special storage, labeling, or handling requirements apply.

    Supply Support

    Sample, Bulk Order and Repeat Supply Support

    Support can be arranged for sample discussion, bulk supply planning, packaging confirmation, and routine sourcing communication based on the actual product and order requirements.

    For repeat-use formulations or long-term procurement plans, buyers may discuss specification consistency, packaging preferences, delivery expectations, and document coordination in advance.

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    Product Categories

    Tags:

    Cationic Polymer Flocculant Polymer Polyamine Polymer Water Treatment Polymer

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