What Is an Example of a Nonionic Surfactant? Types, HLB and Real-World Uses

If you want the single most representative example, pick the fatty alcohol ethoxylate. C12–14 fatty alcohol plus an average of nine ethylene oxide units gives you AEO-9, the grade that carries most of the cleaning work in laundry liquids, hard-surface cleaners and textile scouring baths around the world. If your reference point is food, cosmetics or pharmaceuticals, the example you will meet most often is polysorbate 80, the polyoxyethylene(20) sorbitan monooleate listed on ingredient declarations as polysorbate 80.

Why does the specific example matter? Because "nonionic" is not one product. It is a family of several hundred commercial grades built from different hydrophobes and different ethylene oxide (EO) chain lengths. Two drums labeled "nonionic surfactant" can differ in HLB by ten points, in cloud point by forty degrees, and in emulsion behavior completely: one pushes water into oil, the other disperses oil into water. Copying the wrong example costs a full formulation cycle.

The rest of this page walks through the examples that actually get specified in real plants, the numbers behind them (HLB, cloud point, EO value), how nonionics differ from the anionic products they often sit beside, and the checks we recommend before you commit to a purchase order.

What "Nonionic" Actually Means

Every surfactant has two ends: a tail that avoids water and a head that likes it. In anionic surfactants the head carries a negative charge; in cationics, a positive one; in amphoterics it flips with pH. A nonionic surfactant has no charge at all. Its hydrophilic head is a chain of ethylene oxide units, and the oxygens in that chain hold onto water purely through hydrogen bonding.

That one design difference drives most of the practical behavior:

• Hard-water tolerance. With no charge, there is nothing for calcium or magnesium ions to precipitate, so nonionics stay active in hard water without extra builders.
• Compatibility. Nonionics blend with anionic and cationic ingredients alike, which is why they appear as co-surfactants in almost every cleaning formula.
• Low foam. Most nonionics foam far less than sulfates, making them the default choice for machine washing and spray cleaning.
• Temperature-sensitive solubility. Hydrogen bonds weaken as water heats up, so many nonionics turn cloudy above a characteristic temperature, the cloud point described later in this article.
• Broad pH range. Because nothing depends on ionization, performance survives acidic and strongly alkaline systems.

The tail side of the molecule matters just as much. It can be a C12–14 fatty alcohol, a C16–18 alcohol, an alkylphenol, castor oil, a fatty amine or a propylene oxide block. Tail chemistry decides oil affinity and biodegradability; the EO chain decides water affinity. Together they set the HLB number that formulators use to shortlist grades.

The Examples That Matter, Family by Family

Below are the nine families that cover the overwhelming majority of nonionic surfactant volume and customer inquiries. For each one, note the hydrophobe, the typical EO range and where the grade is usually specified.

Fatty Alcohol Ethoxylates (AEO Series)

This is the largest family by volume and the first example to give anyone who asks. A C12–14 fatty alcohol, from coconut or palm kernel oil or from synthetic oxo alcohols, is reacted with three to nine moles of EO. AEO-3 stays oil-soluble (HLB around 8) and works as a water-in-oil emulsifier and defoamer base. AEO-7 balances wetting and cleaning. AEO-9, at HLB around 13–14, is the general-purpose detergent and textile scouring grade. The C16–18 alcohol versions, often labeled "O-series" or Peregal-type grades in Asian datasheets, are heavier liquids used as leveling agents in dyeing and as emulsifiers where a waxier, more substantive feel is wanted. One practical detail: natural C16–18 cuts usually contain oleyl alcohol, which keeps the product pourable at lower warehouse temperatures.

Alkylphenol Ethoxylates (NP and OP Series)

NP-9 (nonylphenol plus 9 EO) and OP-10 (octylphenol plus roughly 10 EO) were for decades the default industrial emulsifier: inexpensive, strong on hydrocarbon oils, indifferent to electrolytes. They still appear in industrial cleaners, metalworking fluids and agrochemical formulations. The caveat is regulatory. Nonylphenol ethoxylates are restricted in the EU and several other markets because they degrade to nonylphenol, which is persistent and aquatic-toxic. Always check the destination market's rules before standardizing on an NP grade; fatty alcohol ethoxylates are the usual drop-in alternative when restrictions apply.

Polysorbates (Tween Series)

Polysorbates are the EO(20) derivatives of sorbitan esters. Tween 20 (polysorbate 20, monolaurate), Tween 40 (palmitate), Tween 60 (monostearate) and Tween 80 (monooleate) all sit at HLB 14.9–16.7, which makes them strong oil-in-water emulsifiers and solubilizers. This is the family a buyer meets in food (E-numbered polysorbate grades), cosmetics and pharmaceutical work: vitamin and essential-oil solubilization, fragrance solubilizing in aqueous products, and emulsion stabilization in creams. Polysorbate 80's amber color and characteristic odor come from the oleate tail; if your formula is white and fragrance-free, polysorbate 20 or 60 is often the better match.

Sorbitan Esters (Span Series)

Remove the EO and esterify sorbitan, the dehydrated form of sorbitol, with a fatty acid, and you get the Span family: Span 20 (monolaurate, HLB 8.6), Span 40, Span 60 (monostearate, HLB 4.7), Span 80 (monooleate, HLB 4.3) and Span 85 (trioleate, HLB 1.8). These are water-in-oil emulsifiers and co-emulsifiers. The classic pairing trick: blend a Span with a Tween, for example Span 80 with Tween 80, to dial the blend's effective HLB to exactly what your oil phase needs. Approved sorbitan ester grades also serve food formulations in many markets.

Castor Oil and Styrenated Phenol Ethoxylates (Agrochemical Emulsifiers)

Castor oil ethoxylates, the EL series (EL-40 carries about 40 moles of EO per mole of oil, HLB around 13), and styrenated phenol ethoxylates, sold in many Chinese datasheets as "agricultural emulsifier 600," are the backbone of emulsifiable concentrate (EC) pesticide formulations. In practice the formulator blends a nonionic component like these with an anionic calcium salt to build an emulsifier pair, commonly dosed at 5–10% of the finished concentrate. If you source agrochemical adjuvant components, ask your supplier to match both the nonionic and the anionic half; they must work as a team at the spray dilution temperature, not just in the lab beaker.

EO/PO Block Copolymers (Poloxamer Type)

Instead of a fatty tail, these use a polypropylene oxide block as the hydrophobe, capped on both ends with polyethylene oxide. By tuning the block sizes, a manufacturer can place the cloud point almost anywhere from below room temperature to above 100 °C. The low-foam grades are the standard wetting-defoaming agents in machine dishwashing, metal spray cleaning and other systems where foam is the enemy. The same specialty-polyether logic extends to propylene glycol block polyethers and trimethylolpropane-based starters for higher functionality.

Fatty Amine Ethoxylates

Ethoxylated coco, tallow or oleyl amines are the subtle family. Above roughly pH 7 they behave as nonionics; in acidic systems the amine nitrogen protonates and the molecule behaves cationically. That switch is used deliberately in antistatic agents, corrosion inhibition, textile auxiliaries and herbicide adjuvants. If your process pH swings, test the grade across the full range, because its charge and therefore its compatibility change with it.

Fatty Acid Ethoxylates and PEG Esters

Add EO directly to lauric, stearic or oleic acid, or esterify polyethylene glycol with fatty acids, and you get PEG esters such as PEG-400 monooleate, PEG-400 dioleate and ethoxylated stearates. HLB typically runs 8–13. They serve as emulsifiers, dispersants and lubricity additives, for example in textile sizing oils and metalworking fluids, where a touch of oil-loving character is wanted without ionic contamination of the system.

Alkyl Polyglucosides (APG)

APGs bond a fatty alcohol to glucose, giving a completely sugar-derived head group. They are nonionic in the strict sense, stable in strong alkali (a rarity, since most nonionics hydrolyze slowly in caustic), read well on plant-based ingredient decks, and foam well for a nonionic. Dishwashing liquids, alkaline cleaners and agricultural wetting agents are their home ground. Typical HLB sits around 11–13 depending on chain length.

How to Read a Nonionic Surfactant Grade Name

Most confusion between "similar" grades disappears once you can parse the name. Take AEO-9 as the worked example:

1. Identify the hydrophobe. "AEO" stands for fatty alcohol ethoxylate, and the feed here is a C12–14 fatty alcohol. Nonylphenol, castor oil or tallow amine would send the molecule in a completely different direction.
2. Read the EO number. The "9" means an average of nine ethylene oxide units per alcohol molecule. More EO means more water-loving: higher HLB, higher cloud point, more detergency and less oil solubility.
3. Estimate HLB from EO content. For glycol-type nonionics, HLB ≈ weight-percent EO divided by 5. AEO-9 runs roughly 65–70% EO by weight, which lands its HLB in the 13–14 range, consistent with its role as a detergent-grade oil-in-water surfactant.
4. Note the physical form. Liquid, paste or flake changes your dosing equipment and melting requirements; the same chemistry in a different form is not always a drop-in swap.
5. Ask for the COA numbers. Cloud point, hydroxyl value, water content and pH are the fingerprint that separates a true AEO-9 from a wide-cut lookalike.

One nuance worth remembering: for starters that are already large molecules, the EO count behaves differently. Castor oil is a triglyceride with a molecular weight near 930, so EL-40, despite its "40 EO" name, is about 65% EO by weight. That is why its HLB lands near 13, close to the alcohol-based grades, rather than far above them.

HLB Values of Common Nonionic Surfactants

HLB, the hydrophilic-lipophilic balance, compresses a molecule's water-versus-oil character onto a 1–20 scale. The quick reading guide most formulators use: values below 6 lean water-in-oil; 7–9 are wetting agents; 8–18 handle oil-in-water emulsification, with 13–15 the classic detergency band and 15–18 the solubilizing band.

Two cautions from the production side. First, HLB is a screening number, not a guarantee: mixed-emulsifier systems, the specific oil phase and the formulation temperature all shift the real optimum. Second, published HLB values vary a little between suppliers because they are calculated from measured EO content and hydroxyl value. Use the chart to shortlist two or three grades, then confirm with bench trials on your own system.

Cloud Point: The Number That Defines Nonionics

Heat a clear solution of AEO-9 and, somewhere in the 80–90 °C range, it suddenly turns milky. Cool it and it clears again. That temperature is the cloud point: the moment thermal motion defeats the hydrogen bonds holding the EO chain in the water. It is the single most defining test for this class of surfactant, and it appears on virtually every nonionic COA.

Why a buyer should care:

• Process clarity. If your product must stay clear on the shelf in a hot climate or work in a hot dyeing bath, choose a grade whose cloud point sits comfortably, usually 10–20 °C, above your maximum service temperature.
• Low-foam design. In machine cleaning, formulators deliberately pick grades whose cloud point is just below the wash temperature; near its cloud point the surfactant stops foaming and starts behaving as a wetting-defoaming agent.
• Identity check. Cloud point reproducibility is one of the fastest QC fingerprints for incoming raw material. A grade that misses its cloud point specification is not the grade on the label.

One more consequence of the hydrogen-bond mechanism: the water solubility of a nonionic falls as temperature rises, which is the opposite of ionic surfactants. If a formulation works at 25 °C and fails at 45 °C, check the cloud point before blaming the active ingredient.

Nonionic vs Anionic Surfactants at a Glance

Anionic surfactants, fatty alcohol sulfates, sulfonates and soaps, still carry the largest share of global detergent volume because they foam well and clean aggressively at low cost. Nonionics trade some of that raw detergency for robustness. The comparison that matters when you decide which class carries, or co-carries, your formula:

In real formulations the two classes usually appear together. The anionic provides foam and primary detergency; the nonionic adds hard-water stability, grease emulsification and electrolyte tolerance. Ratios run from a modest nonionic fraction in a sulfate-based cleaner all the way to anionic-free systems built entirely on AEO grades for low-foam machine applications.

Where Nonionic Surfactants Earn Their Keep

Examples only become useful when tied to the job. These are the application blocks where our customer inquiries concentrate, with the grades most often specified in each.

Buying a Nonionic Surfactant: Checks Before You Order

Generic names hide real differences between suppliers. After more than three decades of ethoxylation work at our Hangzhou Bay plant in Zhejiang, these are the checks we advise every formulator to run, on us and on any other source, before the first bulk order.

Spec sheet items worth verifying

• Active content and the identity of the hydrophobe (carbon number, saturation): this is what you are actually paying for.
• Average EO number and, where available, EO distribution width: narrow cuts give sharper cloud points and more predictable HLB.
• Cloud point at the stated concentration (usually 1% aqueous): the identity fingerprint of the grade.
• Hydroxyl value: cross-checks the molecular-weight claim.
• Water content, pH and color: the three items that most often cause complaints on liquid grades.
• For food, cosmetic or pharma targets: the specific compliance documentation for that grade, not the industrial datasheet.

Practical questions before committing

• Packaging and shelf life: 200 kg drums and 1000 L IBCs are standard for liquid nonionics; confirm storage temperature limits, because some pastes and flakes need warmth to stay handleable.
• Minimum order and lead time per grade, not per product family: high-volume grades like AEO-9 and low-volume specialty blocks rarely share logistics.
• Sample policy and whether the supplier's lab will match your incumbent grade against a reference sample: this is the fastest way to de-risk a change of source.
• Management systems: ISO 9001, ISO 14001 and ISO 45001 certification tell you the plant is audited on quality, environment and occupational safety together, not on a quality certificate alone.

How we support formulators

We run a dedicated laboratory for product analysis and grade matching, because helping a formulator land the right EO number and hydrophobe is the core of our business. It has been since the founding of our predecessor, Shaoxing Yuzhou Chemical, in 1987. Today the SKYDREAM range covers the families described on this page, produced on flexible ethoxylation capacity of 200,000 tonnes per year for special surfactants and 100,000 tonnes per year for dyeing auxiliaries, and shipped to customers in more than 50 countries. If a grade on this page looks close to what you need, send us your incumbent sample or specification and we will match it and quote against it.

Frequently Asked Questions

Is Tween 80 nonionic or anionic?

Nonionic. Polysorbate 80's hydrophilic group is a polyoxyethylene chain with no charge, which is why it tolerates salts and pairs with both charged classes. Its HLB of 15 places it firmly in the oil-in-water emulsifier band.

What is the most common nonionic surfactant in detergents?

The fatty alcohol ethoxylates, especially C12–14 cuts at 7–9 EO sold as AEO-7 and AEO-9. They deliver grease removal in cool water and appear in most laundry liquids and hard-surface cleaners, usually alongside an anionic primary surfactant.

Why did my product turn cloudy when heated?

You crossed the cloud point. Hydrogen bonding between the EO chain and water weakens as temperature rises, and the surfactant separates as fine droplets. The effect is reversible on cooling and is a design feature, not contamination: low-foam cleaners exploit it deliberately.

Can nonionic and anionic surfactants be mixed?

Yes, and they usually are. The molecules coexist at interfaces and often perform better together than either alone: the nonionic shields the system from hard water and electrolytes while the anionic supplies foam and detergency. Cationics are the class that conflicts with anionics, not with nonionics.

What does the number in AEO-9 or NP-9 mean?

The average moles of ethylene oxide added per mole of starter molecule. Nine EO units on a C12–14 alcohol yields roughly 65–70% EO by weight and an HLB near 13–14; the same alcohol at 3 EO is an oil-soluble emulsifier with an HLB near 8.

Are nonionic surfactants food safe?

Only specific grades. Polysorbates and some PEG derivatives have food and pharmacopeia versions with their own specifications and documentation. An industrial-grade Tween 80 with the same chemistry is not automatically compliant, so request the grade-specific certificates rather than assuming from the family name.

Which nonionic surfactants face restrictions?

Nonylphenol ethoxylates are the main one: restricted in the EU and several other markets due to the persistence and aquatic toxicity of their degradation product, nonylphenol. Most other families remain broadly permitted. Verify the destination market before standardizing, and keep a fatty alcohol ethoxylate alternative qualified.

What is the difference between Span and Tween?

Tween is the EO adduct of Span. Span 80 is sorbitan monooleate at HLB 4.3, the water-in-oil side. Tween 80 is the same sorbitan monooleate carrying 20 EO units at HLB 15, the oil-in-water side. Formulators pair them to position the blend's effective HLB exactly where a given oil phase needs it.

A workable next step: write down three numbers from your current application — the HLB band you believe you need, the maximum temperature your product or process will see, and the pH window. With those three constraints, the long list of nonionic examples collapses to two or three candidate grades, and a supplier's lab can match and quote them quickly. Our own laboratory does exactly this kind of matching every week for customers across agriculture, textiles, cleaning and construction; you are welcome to put it to work on your specification.