Is OT-75 the same as pure DOSS/AOT?

OT-75 is a formulated DOSS/AOT solution grade, while CAS 577-11-7 identifies the active sodium di(2-ethylhexyl) sulfosuccinate. Its grade specification defines active content and carrier composition. The nominal OT-75 designation does not establish pure DOSS content or a universal solvent system.

Which specifications define an OT-75 solution grade?

The specification defines DOSS active matter with its method and reporting basis, carrier composition, and relevant physical and quality limits. Water, pH at a stated dilution, viscosity at a stated temperature, color and residual 2-ethylhexanol may be included. Nonvolatile solids and active matter are separate results.

Can another DOSS grade replace OT-75 at the same dosage?

Replacement depends on active content, carrier and formulation performance. Equal product weights can deliver different DOSS quantities. Adjust dosage on the stated active basis, then assess wetting, foam, viscosity and phase stability under the actual processing conditions. The same CAS number alone does not establish grade equivalence.

How is OT-75 active content checked?

A suitable two-phase titration can measure anionic-active matter, with the result reported on a defined mass basis. Other anionic surfactants can contribute to the result, and cationic surfactants can interfere. A DOSS-specific or impurity requirement may need a separately validated chromatographic method for the selected formulation.

How should OT-75 wetting and foam performance be compared?

Compare grades on the same stated active-matter basis, at the same concentration and temperature, using the same water quality, substrate and test method. Cotton-pad immersion and Ross-Miles foam measurements are examples of application tests. Final selection also considers performance in the complete formulation; rapid wetting alone does not guarantee low foam.

Sodium Di(2-ethylhexyl) Sulfosuccinate (DOSS/AOT) OT-75 CAS 577-11-7

Sodium Di(2-ethylhexyl) Sulfosuccinate (DOSS/AOT, OT-75, CAS 577-11-7, EC 209-406-4) is an anionic surfactant used for rapid wetting, penetration, dispersion and emulsification in textile, coating, cleaning and other industrial formulations. OT-75 is a formulated commercial solution grade with grade-specific DOSS active matter and carrier composition. The active DOSS component has the formula C₂₀H₃₇NaO₇S; this formula does not describe the entire solution. Active content and carrier selection guide dosage, handling and formulation suitability.

CAS: 577-11-7
Synonyms: Docusate sodium; Sodium dioctyl sulfosuccinate; DOSS; AOT; Sodium bis(2-ethylhexyl) sulfosuccinate
Einecs: 209-406-4
Molecular Formula: C₂₀H₃₇NaO₇S (active docusate sodium; OT-75 is a formulated solution)
Grade: Industrial OT-75 solution grade; active matter, carrier and quality limits specified for the quoted grade
Package: Packaging and net weight quoted for the selected solution grade, order quantity and destination

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Product Description

1 Product overview

2 Technical information

3 Applications and grade selection

4 Quality data and analytical methods

5 Handling and quotation

Product overview

OT-75 is a commercial DOSS/AOT concentrate based on sodium di(2-ethylhexyl) sulfosuccinate. CAS 577-11-7 and EC 209-406-4 identify the active anionic diester with branched 2-ethylhexyl groups. Commercial DOSS concentrates are available in ethanol/water and glycol/water carrier systems. The quoted OT-75 specification defines the selected carrier, active content and quality limits.

Technical information

Product	Sodium Di(2-ethylhexyl) Sulfosuccinate (DOSS/AOT) OT-75 CAS 577-11-7
CAS number	577-11-7
EC / list number	209-406-4
Molecular formula / identity	C₂₀H₃₇NaO₇S (active docusate sodium; OT-75 is a formulated solution)
Synonyms	Docusate sodium; Sodium dioctyl sulfosuccinate; DOSS; AOT; Sodium bis(2-ethylhexyl) sulfosuccinate
Grade	Industrial OT-75 solution grade; active matter, carrier and quality limits specified for the quoted grade
Packaging	Packaging and net weight quoted for the selected solution grade, order quantity and destination

Applications and grade selection

Active matter and nonvolatile solids are distinct test results and should be reported separately. Dose comparisons use the DOSS active content and its stated basis. For comparison with solid or other formulated DOSS grades, the Sodium Bis(2-ethylhexyl) Sulfosuccinate (DOSS/AOT) product page covers these commercial forms. The selected carrier, water content, physical form and active-matter method determine whether a grade comparison with OT-75 is meaningful.

DOSS/AOT is used for wetting and penetration in textile and cleaning processes, and for dispersion or emulsification in coatings, inks and other industrial formulations. It is also evaluated as a wetting component in agrochemical formulations. Wetting time, foam, clarity and phase stability are assessed in the intended system at defined concentration, temperature, water quality and substrate. Rapid wetting does not by itself establish low-foam performance.

For cleaning and textile wetting, AEO-7 (Fatty Alcohol Ethoxylate 7EO) and selected Isotridecyl Alcohol Ethoxylate grades provide nonionic surfactants to compare with DOSS or evaluate as co-surfactants. Alcohol structure and EO level affect formulation behavior, so blending is assessed in the complete formulation. Disodium Laureth Sulfosuccinate (DLS) is a different ethoxylated monoester sulfosuccinate used in cleansing and foaming systems; its composition and performance are distinct from DOSS.

Quality data and analytical methods

A suitable two-phase titration can determine anionic-active matter. In a blend containing other anionic surfactants, the result is not automatically specific to DOSS; cationic surfactants can make the method unsuitable. Results should state the method and whether the basis is the as-supplied solution or dry material. Water may be measured by a Karl Fischer method suitable for the carrier matrix. Where DOSS-specific assay or impurity data are needed, a validated chromatographic method may be appropriate. Grade data may also include appearance, color, pH at a stated dilution, viscosity at a stated temperature, acid value and residual 2-ethylhexanol.

We can provide a COA (Certificate of Analysis), TDS (Technical Data Sheet), SDS (Safety Data Sheet), and relevant quality data for the quoted OT-75 grade. Analytical reports or chromatograms can be included where required by the agreed grade documentation.

Handling and quotation

Store and handle the selected grade according to its SDS, including fire precautions and transport classification. Ethanol-containing grades can have flammability requirements. Strongly acidic or alkaline conditions, especially with heat, can accelerate ester hydrolysis. For a quotation, send the application, quantity and destination; add a reference specification or preferred carrier if available.

FAQ - Technical & Supply Chain

Q:
Is OT-75 the same as pure DOSS/AOT?

A: OT-75 is a formulated DOSS/AOT solution grade, while CAS 577-11-7 identifies the active sodium di(2-ethylhexyl) sulfosuccinate. Its grade specification defines active content and carrier composition. The nominal OT-75 designation does not establish pure DOSS content or a universal solvent system.
Q:
Which specifications define an OT-75 solution grade?

A: The specification defines DOSS active matter with its method and reporting basis, carrier composition, and relevant physical and quality limits. Water, pH at a stated dilution, viscosity at a stated temperature, color and residual 2-ethylhexanol may be included. Nonvolatile solids and active matter are separate results.
Q:
Can another DOSS grade replace OT-75 at the same dosage?

A: Replacement depends on active content, carrier and formulation performance. Equal product weights can deliver different DOSS quantities. Adjust dosage on the stated active basis, then assess wetting, foam, viscosity and phase stability under the actual processing conditions. The same CAS number alone does not establish grade equivalence.
Q:
How is OT-75 active content checked?

A: A suitable two-phase titration can measure anionic-active matter, with the result reported on a defined mass basis. Other anionic surfactants can contribute to the result, and cationic surfactants can interfere. A DOSS-specific or impurity requirement may need a separately validated chromatographic method for the selected formulation.
Q:
How should OT-75 wetting and foam performance be compared?

A: Compare grades on the same stated active-matter basis, at the same concentration and temperature, using the same water quality, substrate and test method. Cotton-pad immersion and Ross-Miles foam measurements are examples of application tests. Final selection also considers performance in the complete formulation; rapid wetting alone does not guarantee low foam.

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