Does CAS 9036-19-5 identify OP-7 with exactly seven EO units?

No. CAS 9036-19-5 covers octylphenol ethoxylates across different EO grades. OP-7 denotes a nominal average of about seven EO units in a commercial distribution. OP-10 and Triton X-100-type grades are not automatically identical to OP-7.

Is OP-7 suitable for every destination market?

No. The 4-tert-octylphenol ethoxylate group is subject to REACH Annex XIV authorisation in the EU/EEA. Requirements depend on the exact composition, intended use, supply chain and applicable authorisation route or exemption. Product selection also takes account of destination-market and customer requirements. Tell us your application and destination when requesting a quotation.

OP-7 Octylphenol Ethoxylate CAS 9036-19-5

OP-7 octylphenol ethoxylate, CAS 9036-19-5, is a nonionic wetting agent and emulsifier for industrial cleaning, metal degreasing, textile processing and emulsion formulations. The commercial grade designation refers to a nominal average of about 7 ethylene oxide (EO) units, with a distribution of ethoxylate chain lengths. Grade selection depends on active matter, water and solvent content, hydroxyl value and cloud point measured under defined conditions. Physical form and handling data are specified for the supplied grade and temperature.

CAS: 9036-19-5
Synonyms: Octylphenol ethoxylate (nominal average about 7 EO); octylphenol polyoxyethylene ether OP-7; emulsifier OP-7; OPE-7
Molecular Formula: C₁₄H₂₂O(C₂H₄O)n; nominal average n≈7, with a commercial ethoxylate distribution.
Grade: Industrial OP-7 grade; active matter, water/solvent content, hydroxyl value and cloud point under stated test conditions.
Package: Drums or IBC; container material and net weight are specified in the quotation.
ECHA List No.: 618-541-1 (technical database identifier)

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Product Description

1 Parameters

2 Applications

3 Grade Selection

4 Quality Documentation

5 Storage

Parameters

CAS Number	9036-19-5
ECHA List No.	618-541-1 (technical database identifier)
Identity / Formula	C₁₄H₂₂O(C₂H₄O)n; nominal average n≈7, with a commercial ethoxylate distribution.
Grade / Specification	Industrial OP-7 grade; active matter, water/solvent content, hydroxyl value and cloud point under stated test conditions.
Key physical data	Physical form, appearance and viscosity depend on the grade and temperature. Hydroxyl value is reported in mg KOH/g. Cloud-point results state the test concentration, medium and method; there is no single value that applies to every OP-7 grade.
Packaging	Drums or IBC; container material and net weight are specified in the quotation.

Applications

OP-7 provides wetting and emulsification in compatible industrial cleaning, metal-degreasing and textile-processing formulations. Oil phase, electrolyte content and operating temperature influence performance, so formulation trials use the intended process conditions. Destination-market and customer requirements also affect product selection.

Grade Selection

Active matter describes the surfactant fraction under the stated test method; it is not the purity of one molecule containing exactly seven EO units. Compare water and solvent content, hydroxyl value and the ethoxylate distribution against your formulation requirements. Cloud-point values are comparable only when concentration, test medium and method match.

Triton X-100-type octylphenol ethoxylate and the OP series offer related OPE grades with different ethoxylate distributions. NPE-10 has a nonylphenol hydrophobe and is also an alkylphenol ethoxylate; it is not an APEO-free alternative. Compare the specific grade data rather than treating these names or CAS numbers as interchangeable.

For formulations evaluating alcohol ethoxylates, AEO-7, AEO-9 / MOA-9 and C9-11 alcohol ethoxylate are separate candidates. Compare wetting, emulsification, foam and compatibility at the process temperature. Similar EO numbers do not establish a one-to-one replacement for OP-7.

Quality Documentation

We can provide a COA (Certificate of Analysis), TDS (Technical Data Sheet) and SDS (Safety Data Sheet) for the quoted OP-7 grade. Where required by the agreed specification, we can also provide applicable GC reports for residual ethylene oxide and 1,4-dioxane, and HPLC data for free PEG or the ethoxylate distribution.

Residual ethylene oxide and 1,4-dioxane results identify the substance, method and reporting limit, with concentrations in units such as mg/kg. HPLC results for free PEG or the ethoxylate distribution state the applicable molecular-mass range, detection and calculation basis. A GC area percentage alone does not describe the purity of the whole OP-7 distribution. Analytical methods are matched to the product matrix and agreed limits.

Storage

Keep containers tightly closed in a cool, dry, ventilated area. Use packaging compatible with the supplied grade, prevent contamination and keep away from strong oxidizers. Follow the grade-specific SDS for handling and prevent release to drains or watercourses.

FAQ - Technical & Supply Chain

Q:
Does CAS 9036-19-5 identify OP-7 with exactly seven EO units?

A: No. CAS 9036-19-5 covers octylphenol ethoxylates across different EO grades. OP-7 denotes a nominal average of about seven EO units in a commercial distribution. OP-10 and Triton X-100-type grades are not automatically identical to OP-7.
Q:
What should I compare when replacing OP-7 in a formulation?

A: Compare active matter, water/solvent content and cloud point under matching test conditions, then test wetting, emulsification, foam and compatibility at the process temperature. Alcohol ethoxylates are separate formulation candidates; similar EO numbers or HLB values do not establish a one-to-one replacement.
Q:
Is OP-7 suitable for every destination market?

A: No. The 4-tert-octylphenol ethoxylate group is subject to REACH Annex XIV authorisation in the EU/EEA. Requirements depend on the exact composition, intended use, supply chain and applicable authorisation route or exemption. Product selection also takes account of destination-market and customer requirements. Tell us your application and destination when requesting a quotation.

Ordering & Documentation

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

Documents

Tell us which documents your procurement team needs. Before an order, we will check whether the quoted source can provide them for the offered lot.

Quotation

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

Sample & Supply

Ask whether samples, trial quantities or repeat orders are possible. We will check each request against the sourced product and current offer.

Storage & Shipping

Product-specific conditions are confirmed before order.

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