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    Related: Polyoxyl 35 Castor Oil PEG-35 Castor Oil Polysorbate 20
    • Polyoxyl 35 Castor Oil (Cremophor® EL-Type) CAS 61791-12-6
    • Polyoxyl 35 Castor Oil (Cremophor® EL-Type) CAS 61791-12-6
    • Polyoxyl 35 Castor Oil (Cremophor® EL-Type) CAS 61791-12-6

    Polyoxyl 35 Castor Oil (Cremophor® EL-Type) CAS 61791-12-6

    Polyoxyl 35 Castor Oil (CAS 61791-12-6), also known as PEG-35 castor oil and macrogolglycerol ricinoleate, is a nonionic solubilizer and emulsifier derived from nonhydrogenated castor oil with an average addition of approximately 35 mol of ethylene oxide per mol of castor oil. Its composition includes ethoxylated glycerides, PEG ricinoleate esters, free polyethylene glycol and ethoxylated glycerol. Grade selection depends on the intended oil phase, quality requirements and formulation performance.

    • CAS: 61791-12-6
    • Synonyms: Polyoxyl 35 castor oil; PEG-35 castor oil; macrogolglycerol ricinoleate; castor oil ethoxylate (approximately 35 EO)
    • Einecs: 500-151-7 (NLP family reference for castor-oil ethoxylates)
    • Molecular Formula: Multicomponent castor-oil ethoxylate containing ethoxylated glycerides, PEG ricinoleate esters, free polyethylene glycol and ethoxylated glycerol; no single fixed molecular formula or molecular weight.
    • Grade: Nominal 35-EO grade; analytical requirements and application grade specified in the quotation.
    • Package: Drums or bulk, with container type and net weight agreed for the order.
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    Product Description

    Polyoxyl 35 Castor Oil (PEG-35), CAS 61791-12-6: nonionic solubilizer and emulsifier for oil-in-water formulations. Request a bulk quotation; COA, TDS and SDS can be provided.

    1 Technical Specifications
    2 Applications and Grade Selection
    3 Storage
    4 Safety and Quotation Information

    Technical Specifications

    Property Grade Information
    CAS Number 61791-12-6
    EC / NLP Reference 500-151-7 (NLP family reference for castor-oil ethoxylates)
    Composition Multicomponent castor-oil ethoxylate containing ethoxylated glycerides, PEG ricinoleate esters, free polyethylene glycol and ethoxylated glycerol; no single fixed molecular formula or molecular weight.
    Nominal EO Grade Average addition of approximately 35 mol of ethylene oxide per mol of castor oil; individual components have different chain lengths.
    Physical Form Usually a yellowish viscous liquid. Appearance and flow depend on grade and temperature.
    Analytical Profile Acid value, hydroxyl value and saponification value, reported in mg KOH/g with the applicable test methods.
    Water Content Karl Fischer determination where specified for the grade; reported as mass percent (% w/w).
    Grade / Specification Nominal 35-EO grade; analytical requirements and application grade specified in the quotation.
    Packaging Drums or bulk, with container type and net weight agreed for the order.

    Acid, hydroxyl and saponification values help compare the free-acid, hydroxyl and ester characteristics of different batches or sources. Physical-property results such as pH, viscosity and cloud point include the applicable concentration, temperature and test method.

    LC profiling, including LC–MS, can characterize PEG-related and fatty-acid ester distributions. A normalized detector-response percentage describes a composition profile, rather than total mass purity. Residual ethylene oxide and 1,4-dioxane can be quantified by an applicable headspace GC method and reported in ppm. Analytical limits and additional oxidation or microbiological requirements depend on the agreed grade and application.

    We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS), together with the chromatographic or residual-impurity information specified for the order.

    Applications and Grade Selection

    Polyoxyl 35 Castor Oil is used to solubilize oil-soluble ingredients and form oil-in-water emulsions in suitable personal-care and technical formulations. Selection depends on the oil phase or active ingredient, surfactant concentration, pH, electrolyte content and process temperature. Pharmaceutical applications require an excipient grade with the relevant compendial and impurity requirements; microbial and endotoxin controls apply according to the intended use and route.

    Within the castor-oil ethoxylate family, Castor Oil Ethoxylate EL-40 is a nominal 40-EO grade for comparison. For other nonionic chemistries, Polysorbate 20 and Polysorbate 80 are sorbitan ester ethoxylates, while Poloxamer 188 (F68) is an EO/PO block copolymer. Their composition and formulation behavior differ, so changes in grade or chemistry require formulation testing rather than an assumed one-for-one substitution.

    Storage

    Store in tightly closed, compatible containers in a cool, dry area, protected from contamination and excessive heat. Conditioning, mixing and handling temperatures follow the supplied grade’s TDS and SDS.

    Safety and Quotation Information

    The supplied-grade SDS covers personal protection, exposure controls, spill response, transport and disposal information. For a quotation, send the required quantity, application and destination, together with any essential grade or analytical requirements.

    FAQ - Technical & Supply Chain

    • Q:

      What does the 35 in Polyoxyl 35 Castor Oil mean?

      A: It identifies an average addition of approximately 35 mol of ethylene oxide per mol of castor oil. The product contains a distribution of ethoxylated glycerides, PEG esters and free glycols, rather than one molecule with a fixed chain length. Polyoxyl 35 Castor Oil and PEG-35 castor oil are names for this nominal grade.
    • Q:

      Does Cremophor® EL-Type mean BASF-branded material?

      A: EL-type is a product-type comparison reference. Cremophor® EL is a BASF trademark; this description does not claim BASF origin or automatic brand equivalence. If original branded material is required, include the brand name in the quotation request.
    • Q:

      What matters when selecting a grade for an existing formulation?

      A: Compare appearance, acid, hydroxyl and saponification values, water content and the impurity limits relevant to the application. Then evaluate clarity, solubilization or emulsification, viscosity and stability in the complete formulation at its actual pH and process temperature. A different EO grade or surfactant chemistry is a comparison option, not an automatic one-for-one replacement.

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    Key information for document requests, quotations, and supply planning.

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    Storage & Shipping

    Product-specific conditions are confirmed before order.

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