Does OP-15 have a fixed composition because it is listed under CAS 9036-19-5?

No. CAS 9036-19-5 identifies an octylphenol-ethoxylate family, while OP-15 is a grade centered around fifteen EO units. Its suitability depends on the delivered active matter, cloud point or HLB with stated method, physical form, and performance in the intended formulation.

What regulatory information is needed before supplying OP-15 to a destination market?

State the destination country and exact intended use, then confirm the offered identity and grade against any applicable authorisation, exemption and customer restriction. CAS 9036-19-5 alone does not establish market compliance.

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

Octylphenol Ethoxylate OP-15 (CAS 9036-19-5, EC/List 618-541-1) is a nonionic surfactant distribution centered on about 15 ethylene oxide units. Compared with OP-10 it is more highly ethoxylated and normally more hydrophilic, with different physical form and cloud-point behavior. It is used as an oil-in-water emulsifier, dispersant, wetting agent and solubilizing aid in industrial formulations. Buyers should specify hydroxyl value, water, pH, appearance, cloud point or HLB and active matter in the TDS and batch COA rather than a fixed formula or 99% purity. EU and UK authorisation requirements for 4-tert-octylphenol ethoxylates must be checked for the intended use.

CAS: 9036-19-5
Synonyms: OP-15; OPE-15; Octylphenol polyoxyethylene ether (about 15 EO); t-Octylphenol ethoxylate; Polyethylene glycol tert-octylphenyl ether; Nonionic O/W emulsifier
Einecs: 618-541-1
Molecular Formula: Average structure C14H22O(C2H4O)n, with n about 15; a homolog distribution with no single fixed molecular formula.
Grade: Confirm the nominal EO or PO level, feedstock range, active matter, water, physical form and relevant analytical values against the current TDS and COA.
Package: State required quantity, physical form and destination; confirm the current bag or container, liner, net weight, temperature handling and transport requirements before quotation.

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Product Description

1 Technical Specifications

2 Applications

3 Storage

4 Safety / Regulatory

Technical Specifications

Property	Specification
Identity	Commercial 4-tert-octylphenol ethoxylate distribution, about 15 EO; CAS 9036-19-5; EC/List 618-541-1.
Specification basis	Grade properties and batch COA, not a fixed molecular formula or a single-substance purity percentage.
Key controls	Hydroxyl value, water, pH, appearance, cloud point or HLB, active matter and application performance.
Grade distinction	OP-15 and OP-10 share a broad identity but differ in average EO and performance; keep separate specifications.

Applications

Oil-in-water emulsification and emulsion stabilization. Wetting, dispersion and solubilizing support in industrial formulations. Textile, coating and industrial-cleaning process aids. Agrochemical or metal-treatment formulations after compatibility and regulatory review.

Storage

Keep tightly closed in the original compatible container in a cool, dry, ventilated place, protected from moisture, contamination, excessive heat and incompatible materials. Follow the supplier TDS/SDS and the shelf-life conditions stated for the delivered lot; do not assume a fixed two-year shelf life.

Safety / Regulatory

Review the current supplier SDS, use suitable gloves and eye protection, prevent environmental release and follow local transport and disposal rules. 4-tert-Octylphenol ethoxylates are subject to EU and UK REACH authorisation controls for relevant uses. Waste classification depends on the material, contamination and local law and is not automatically hazardous waste.

FAQ - Technical & Supply Chain

Q:
Does OP-15 have a fixed composition because it is listed under CAS 9036-19-5?

A: No. CAS 9036-19-5 identifies an octylphenol-ethoxylate family, while OP-15 is a grade centered around fifteen EO units. Its suitability depends on the delivered active matter, cloud point or HLB with stated method, physical form, and performance in the intended formulation.
Q:
What regulatory information is needed before supplying OP-15 to a destination market?

A: State the destination country and exact intended use, then confirm the offered identity and grade against any applicable authorisation, exemption and customer restriction. CAS 9036-19-5 alone does not establish market compliance.

Ordering & Documentation

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

Documents

COA, TDS, SDS/MSDS and packing details are available on request.

Quotation

Send the CAS number, grade, quantity, packing preference and destination.

Sample & Supply

Support is available for samples, trial orders, bulk and repeat supply.

Storage & Shipping

Product-specific conditions are confirmed before order.

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