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    Related: Lubricant Additive PDMS Calcium Stearate
    • Polyisobutylene CAS 9003-27-4

    Polyisobutylene CAS 9003-27-4

    Polyisobutylene (PIB), CAS 9003-27-4, is a synthetic nonpolar hydrocarbon homopolymer supplied for lubricant, adhesive, sealant, rubber and personal-care applications. Confirm the required molecular weight grade, then request a quotation with COA/TDS/SDS for bulk supply.

    • CAS: 9003-27-4
    • Synonyms: PIB, Polyisobutene, Isobutylene polymer, 2-methyl-1-propene homopolymer, Poly(isobutylene)
    • Einecs: 618-360-8
    • Molecular Formula: (C₄H₈)ₙ
    • Grade: Industrial Grade / Cosmetic Grade (customizable)
    • Package: 25 kg kraft bag, 180–200 kg steel drum, or 1,000 kg IBC / bulk
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    Product Description

    Polyisobutylene, CAS 9003-27-4, commonly abbreviated PIB, is a synthetic nonpolar hydrocarbon homopolymer produced from isobutylene; the EC/EINECS number is 618-360-8.

    Synonyms: PIB; Polyisobutene; Isobutylene polymer; 2-methyl-1-propene homopolymer; Poly(isobutylene).

    CAS: 9003-27-4.

    Molecular formula: (C₄H₈)ₙ.

    EC number: 618-360-8.

    Depending on molecular weight, it ranges from a colorless to light-yellow, tacky viscous liquid to a semi-solid or rubber-like solid.

    The density is about 0.91–0.93 g/mL at 25 °C; the refractive index at 20 °C is about 1.50–1.51.

    Low molecular weight grades are viscous liquids or tacky semi-solids, while high molecular weight grades are rubber-like solids with a glass transition around -64 °C.

    It is insoluble in water and soluble in many non-polar solvents such as aliphatic and aromatic hydrocarbons; volatility is very low.

    It is chemically inert and permanently tacky, providing thermal stability, oxidation resistance, barrier properties and electrical insulation.

    It is used as a tackifier, viscosity modifier, sealant and barrier polymer in lubricant additives, adhesives, sealants, stretch films and polymer compounds.

    It is also used in rubber and tire inner liners, plastics and bitumen modification, and selected personal-care and cosmetic systems.

    Non-reactive PIB has a saturated, nonpolar backbone, while reactive PIB contains functional groups for further chemical modification; confirm the intended reactive or non-reactive type.

    Confirm the required molecular weight or viscosity grade, appearance and application; store in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers, heat and ignition sources.

    Confirm the current product-specific specification.

    Confirm packaging with the requested quantity and destination requirements.

    Document requirements should be confirmed from the current specification, SDS, COA or other product-specific files.

    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 specification, quantity, packaging, destination and document needs.

    FAQ - Technical & Supply Chain

    • Q:

      What is Polyisobutylene CAS 9003-27-4?

      A: Polyisobutylene, or PIB, is a synthetic nonpolar hydrocarbon homopolymer produced from isobutylene. CAS 9003-27-4 identifies the polymer type, while commercial grades are further defined by molecular weight, molecular weight distribution and viscosity.
    • Q:

      How does molecular weight affect Polyisobutylene?

      A: Low molecular weight PIB grades are typically viscous liquids or tacky semi-solids, while high molecular weight grades are rubber-like solids. Molecular weight controls viscosity, tack, elasticity and suitability for lubricants, adhesives, sealants or polymer modification.
    • Q:

      What is the difference between reactive and non-reactive PIB?

      A: Non-reactive PIB has a saturated, nonpolar backbone and remains chemically inert and permanently tacky, making it useful as a tackifier, viscosity modifier or barrier polymer. Reactive PIB contains functional groups for further chemical modification or covalent incorporation into formulated products.
    • Q:

      What is Polyisobutylene used for?

      A: PIB is used in lubricant additives, viscosity modifiers, adhesives, sealants, pressure-sensitive adhesive formulations, stretch films and industrial polymer compounds. It is also used in selected personal-care and cosmetic raw material systems.
    • Q:

      How should Polyisobutylene be stored and handled?

      A: Store PIB in tightly closed containers in a cool, dry, ventilated area away from strong oxidizers, heat and ignition sources. Follow appropriate spill-control and disposal measures and use suitable personal protective equipment during bulk transfer.

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