Is OP-7 automatically equivalent to another octylphenol ethoxylate carrying CAS 9036-19-5?

No. The CAS number denotes a family of octylphenol ethoxylate compositions, not one fixed ethoxylate distribution. OP-7 normally indicates a nominal EO level, but the actual distribution and test values must be compared. Confirm the offered grade’s average EO level, cloud point, hydroxyl value and stated test methods rather than substituting by CAS alone.

What should be confirmed when replacing OP-7 in an industrial formulation?

Keep the intended use and test conditions unchanged, then compare the proposed material in that system. Relevant checks can include wetting, emulsification, phase behaviour, cloud point and finished-system appearance. A similar HLB statement or nominal EO description does not by itself demonstrate that another octylphenol ethoxylate is a suitable replacement.

How should OP-7 be screened for a destination market?

Octylphenol ethoxylate acceptability can depend on destination, end use, mixture concentration and current requirements. A CAS number and generic trade description do not establish compliance. Identify the intended market and use, then check the applicable requirements and request documents for the actual offered grade before selecting it.

OP-7 Octylphenol Ethoxylate CAS 9036-19-5

OP-7 is a commercial octylphenol ethoxylate distribution with nominally about seven ethylene-oxide units, used as a nonionic surfactant where the supplied grade is technically and legally suitable. It is not a single compound. Specify active matter, solvent/water, EO distribution and cloud point on TDS/COA. Regulatory review is mandatory: if the substance falls within the EU REACH Annex XIV group 4-tert-OPnEO, EU/EEA use after the sunset date generally requires a valid supply-chain/use-specific authorisation or an applicable exemption. Confirm exact composition, intended use, customer role and destination law before sale or use; do not imply unrestricted use. For a higher nominal EO octylphenol ethoxylate, OP-10 is a related grade to compare by cloud point, HLB and active matter.

CAS: 9036-19-5
Synonyms: Octylphenol ethoxylate (nominally about 7 EO); emulsifier OP-7; OPE-7
Einecs: 618-541-1
Molecular Formula: Octylphenol ethoxylate distribution, represented generically as C₁₄H₂₂O(C₂H₄O)n with nominal n≈7; no single molecular formula or molecular weight.
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 Parameters

2 Applications

3 Storage

4 Safety / Regulatory

Parameters

CAS Number	9036-19-5
EC / List No.	618-541-1
Identity / Formula	Octylphenol ethoxylate distribution, represented generically as C₁₄H₂₂O(C₂H₄O)n with nominal n≈7; no single molecular formula or molecular weight.
Grade / Specification	Commercial OP-7 grade; specify active matter, solvent/water, EO distribution, cloud point and batch COA. Do not describe as a single pure compound.
Key physical data	Nominally about 7 EO units; active matter, solvent/water, cloud point and density are grade-specific. Confirm TDS/COA.
Packaging	Packaging is order- and grade-dependent. Confirm the current container, liner, net weight, compatibility and handling requirements before ordering.

Applications

Evaluate only in technically compatible and legally permitted wetting, emulsification or cleaning processes. No application is pre-approved; validate performance and complete destination-market and use-specific regulatory review first.

Storage

Store in the original tightly closed compatible container in a cool, dry, ventilated area, away from heat, ignition sources, moisture and incompatible materials. Prevent contamination and follow the supplier SDS.

Safety / Regulatory

Regulatory review is mandatory. If the exact composition falls within 4-tert-OPnEO, EU/EEA use after the REACH Annex XIV sunset date generally requires a valid supply-chain/use-specific authorisation or an applicable exemption. Confirm composition, use, customer role and destination law; this copy does not grant approval.

FAQ - Technical & Supply Chain

Q:
Is OP-7 automatically equivalent to another octylphenol ethoxylate carrying CAS 9036-19-5?

A: No. The CAS number denotes a family of octylphenol ethoxylate compositions, not one fixed ethoxylate distribution. OP-7 normally indicates a nominal EO level, but the actual distribution and test values must be compared. Confirm the offered grade’s average EO level, cloud point, hydroxyl value and stated test methods rather than substituting by CAS alone.
Q:
What should be confirmed when replacing OP-7 in an industrial formulation?

A: Keep the intended use and test conditions unchanged, then compare the proposed material in that system. Relevant checks can include wetting, emulsification, phase behaviour, cloud point and finished-system appearance. A similar HLB statement or nominal EO description does not by itself demonstrate that another octylphenol ethoxylate is a suitable replacement.
Q:
How should OP-7 be screened for a destination market?

A: Octylphenol ethoxylate acceptability can depend on destination, end use, mixture concentration and current requirements. A CAS number and generic trade description do not establish compliance. Identify the intended market and use, then check the applicable requirements and request documents for the actual offered grade before selecting it.

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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