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    Related: OP-15 9036-19-5 Octylphenol ethoxylate
    • Octylphenol Ethoxylate OP-15 (About 15 EO) CAS 9036-19-5
    • Octylphenol Ethoxylate OP-15 (About 15 EO) CAS 9036-19-5

    Octylphenol Ethoxylate OP-15 (About 15 EO) CAS 9036-19-5

    OP-15 octylphenol ethoxylate (CAS 9036-19-5) is a nonionic surfactant used for oil-in-water emulsification, wetting and dispersion in industrial formulations. This listing refers to a grade with a nominal average of about 15 EO units, with a distribution of ethoxylate chain lengths. Product codes and properties vary between manufacturers. COA (Certificate of Analysis), TDS (Technical Data Sheet) and SDS (Safety Data Sheet) can be provided for the quoted grade.

    • CAS: 9036-19-5
    • Synonyms: OP-15; OPE-15; Octylphenol ethoxylate (nominal 15 EO grade); Octylphenol polyoxyethylene ether; t-Octylphenol ethoxylate; Polyethylene glycol tert-octylphenyl ether
    • Molecular Formula: General repeat-unit representation C14H22O(C2H4O)n; the quoted grade has a nominal average n of about 15 and contains an EO-homologue distribution rather than one fixed molecular formula.
    • Grade: Industrial nonionic surfactant; nominal EO, hydroxyl value, water, active-matter basis, pH test conditions and physical form are defined in the quoted grade specification.
    • Package: Drum or bulk packaging; container requirements and net weight are specified with the quotation.
    • ECHA List No.: 618-541-1
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    Product Description

    1 Identity and EO Grade
    2 Quality Specifications and Analytical Data
    3 Applications and Grade Comparisons
    4 Storage, Handling and Destination Requirements

    Identity and EO Grade

    About 15 EO describes a nominal average degree of ethoxylation, not a pure molecule containing exactly fifteen EO units. OP-15 is not a universal manufacturer code: products with similar names can have different EO levels and active-matter contents. The TDS accompanying the quotation defines the offered grade, while the batch COA reports the applicable release results.

    Quality Specifications and Analytical Data

    Quality item Specification basis
    Composition and EO level Octylphenol ethoxylate with a nominal average of about 15 EO. The CAS number identifies the broader ethoxylate family and does not establish one EO count, concentration or interchangeable grade.
    Hydroxyl value Hydroxyl-group content is expressed in mg KOH/g with the titration method and reporting basis. It reflects an average functional-group content, not a direct measurement of every EO homologue.
    Water and active matter Water content and active matter are specified separately, with their methods and mass-reporting basis. Active matter is not the same measurement as an uncalibrated chromatographic peak-area percentage.
    pH Measured in an aqueous solution at the stated concentration and temperature; these conditions accompany the quoted value.
    Cloud point and HLB Cloud point is reported in °C with the method, test medium and concentration. HLB is a separate, dimensionless selection guide with its stated reference basis; it is not a cloud-point result or an EO count.
    Appearance and physical form Colour and physical form are specified at a stated temperature. Supplied concentration and temperature are considered for pumping, dosing and any permitted warming.

    EO-distribution chromatographic information can be provided for grade comparison. An appropriate LC/HPLC method can resolve ethoxylate homologues; peak assignment, detector response, calibration and the molar or mass reporting basis determine what the profile can quantify. A single GC peak-area percentage does not establish the mass purity of the complete ethoxylate distribution. For orders requiring residual ethylene oxide or 1,4-dioxane limits, the grade specification includes the agreed validated analytical method and quantitation limits.

    Applications and Grade Comparisons

    Formulation roles include oil-in-water emulsification and emulsion stabilization, wetting, dispersion and solubilizing support in industrial cleaners, textile processing and coatings. Selection depends on the oil phase, temperature, water quality, electrolyte content and required foam and stability. Performance is evaluated in the complete formulation.

    For octylphenol-ethoxylate comparisons, Triton X-100-type grades and the OP-series range require separate EO and quality specifications. TX-10 / NPE-10 is nonylphenol-derived, with a different hydrophobic group. Alcohol-ethoxylate options such as AEO-7 and AEO-9 / MOA-9 are formulation comparisons, not automatic one-for-one substitutes. Compare wetting, foam, emulsification and stability before selecting an alternative.

    Storage, Handling and Destination Requirements

    Keep sealed in a compatible container in a cool, dry, ventilated place, protected from moisture, contamination and excessive heat. Storage, shelf-life and any permitted warming conditions accompany the grade TDS and SDS. Use suitable gloves and eye protection, prevent environmental release and follow the supplied SDS and applicable transport and disposal requirements.

    Destination and intended use are reviewed with the quotation because octylphenol ethoxylates can be subject to use-specific regulatory controls. EU REACH and UK REACH authorisation requirements must be assessed separately; UK REACH applies in Great Britain, while EU REACH applies in Northern Ireland. A CAS or ECHA list number is not an authorisation or compliance certificate. For a quotation, send the application or reference grade, approximate quantity and destination; detailed acceptance criteria can then be agreed.

    FAQ - Technical & Supply Chain

    • Q:

      Does OP-15 always mean exactly 15 EO?

      A: No. This listing uses OP-15 for a nominal average of about 15 EO, with a distribution of chain lengths rather than one pure homologue. Manufacturer numbering systems vary, and the CAS number alone does not fix the EO level. The quoted grade TDS defines the EO and active-matter specification.
    • Q:

      Can OP-15 directly replace a Triton X-100-type surfactant?

      A: Not automatically. Triton X-100 is a manufacturer-defined grade with an average of about 9.5 EO, whereas this listing refers to nominal 15 EO. EO distribution, active matter, cloud point and formulation performance can differ. A shared surfactant family does not establish one-for-one interchangeability.
    • Q:

      Which quality documents and analytical information can be provided for OP-15?

      A: COA, TDS and SDS can be provided for the quoted grade, with applicable quality specifications and analytical information. EO-distribution profiles support grade comparison; quantitative composition needs an appropriate calibration and reporting basis. Residual-compound testing is separate and is included where the agreed specification requires it.
    • Q:

      What destination information is needed for an OP-15 quotation?

      A: State the destination and intended application so that applicable use restrictions, authorisations or exemptions can be assessed for the offered grade and supply chain. EU and Great Britain requirements are separate. An industrial application, CAS number or product code alone does not establish permission for every use.

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