Does the 603 designation mean one fixed EO number?

No. 603 is a commercial grade designation. CAS 99734-09-5 covers tristyrylphenol ethoxylates with a range of EO chain lengths. The nominal EO number and quality limits are defined for the selected grade; comparison also needs the stated test conditions and formulation performance.

How should cloud-point values be compared for Tristyrylphenol Ethoxylate 603?

Report the test method, product concentration and medium with the cloud-point temperature, including salt concentration when applicable. Compare results under matching conditions. A measurement in deionized water and one in sodium chloride solution should not be treated as the same specification.

Tristyrylphenol Ethoxylate 603 CAS 99734-09-5

Tristyrylphenol Ethoxylate 603 (CAS 99734-09-5) is a nonionic emulsifier for agrochemical formulations. Also known as polyethylene glycol mono(tristyrylphenyl) ether, it contains ethoxylates with a range of EO chain lengths. Grade comparison uses the nominal EO number and specified test conditions, rather than the 603 label alone. We can provide a Certificate of Analysis (COA), Technical Data Sheet (TDS) and Safety Data Sheet (SDS).

CAS: 99734-09-5
Synonyms: Agricultural Emulsifier 603, Tristyrylphenol Ethoxylate, Polyethylene Glycol Mono(tristyrylphenyl) Ether, Polyoxyethylene Tristyrylphenyl Ether, TSPE
Molecular Formula: (C₂H₄O)ₙC₃₀H₃₀O (schematic expression; n varies within the EO-chain-length distribution)
Grade: Commercial 603 grade; specification based on nominal EO number, hydroxyl value, water content, pH and cloud-point test conditions.
Package: Drums or bulk; packaging, net weight and handling agreed with the quotation.
ECHA List No.: 619-457-8

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Product Description

1 Identity and grade specification

2 Agrochemical applications and formulation selection

3 Cloud-point and quality comparisons

5 Handling and quotation

Identity and grade specification

Item	Technical information
Product identity	Tristyrylphenol ethoxylate; polyethylene glycol mono(tristyrylphenyl) ether
CAS / List number	99734-09-5 / 619-457-8 (ECHA List)
Composition	Mixture of tristyrylphenol ethoxylates with different EO chain lengths. (C₂H₄O)ₙC₃₀H₃₀O is a schematic expression; n varies between ethoxylate homologues.
Grade designation	603 is a commercial grade designation, not a fixed EO number or a single molecular formula.
Specification comparison	Nominal EO number, hydroxyl value (mg KOH/g), water content (% by mass), pH at the stated test concentration, and cloud point with its method and test medium
Physical form	Physical form and viscosity depend on the grade and handling temperature; the grade TDS gives the applicable handling conditions.

Agrochemical applications and formulation selection

Tristyrylphenol ethoxylates serve as nonionic emulsifiers or dispersing components in crop-protection concentrates, including emulsifiable concentrates (EC) and suspension concentrates (SC). The 603 grade is selected for the active ingredient, solvent and surfactant package. A common CAS number identifies the chemical family but does not establish equivalent formulation performance.

For EC formulations, assess concentrate compatibility and the emulsion after dilution in the intended water. Emulsion spontaneity, separation or creaming, re-emulsification and hard-water performance provide useful comparisons at the intended dilution and temperature. For SC formulations, evaluate dispersion and storage stability in the actual active-ingredient system. Permitted co-formulants and formulation registration depend on the destination market.

Cloud-point and quality comparisons

A cloud-point temperature needs its test method, product concentration and medium. Measurements in deionized water and in sodium chloride solution are not directly interchangeable; salt concentration must be stated when applicable. Hydroxyl value supports ethoxylation-grade comparison alongside the nominal EO number, while formulation testing establishes suitability for the intended concentrate.

Related emulsifiers for formulation comparison

Castor Oil Ethoxylate EL-40 offers a different nonionic emulsifier family for EC formulation screening. Compare the specified ethoxylation grade and performance in the intended solvent and active-ingredient system. Octylphenol Ethoxylate OP-10 provides a comparison with another ethoxylated aromatic surfactant.

For EW formulation screening, Polysorbate 60 (Tween 60) and Polysorbate 80 (Tween 80) are oil-in-water emulsifier candidates with different fatty-acid structures: stearate-based Tween 60 and oleate-based Tween 80. Compare handling at the required temperature and emulsion stability in the actual oil phase. Selection or replacement requires testing in the intended formulation.

Handling and quotation

Keep containers tightly closed in a dry, ventilated storage area. Follow the grade TDS for handling temperatures and any warming or homogenization instructions, and the SDS for personal protection, spill response and transport. For a quotation, send the required quantity and destination; a reference grade or formulation type helps narrow the specification.

FAQ - Technical & Supply Chain

Q:
Does the 603 designation mean one fixed EO number?

A: No. 603 is a commercial grade designation. CAS 99734-09-5 covers tristyrylphenol ethoxylates with a range of EO chain lengths. The nominal EO number and quality limits are defined for the selected grade; comparison also needs the stated test conditions and formulation performance.
Q:
How should cloud-point values be compared for Tristyrylphenol Ethoxylate 603?

A: Report the test method, product concentration and medium with the cloud-point temperature, including salt concentration when applicable. Compare results under matching conditions. A measurement in deionized water and one in sodium chloride solution should not be treated as the same specification.

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