Views: 0 Author: Site Editor Publish Time: 2026-09-11 Origin: Site
Every degreaser, from a kitchen spray to an industrial parts washer, depends on one key ingredient: a surfactant. It is the chemical that lifts oil and grease off surfaces so water can wash them away.
Formulators often ask us the same question: "Which surfactant is the strongest at removing grease?" The honest answer is: there is no single "strongest" surfactant. The best choice depends on the job — the type of oil, the surface, the water, and the equipment. But some types clearly stand out for degreasing, and knowing how to choose them is what separates a good cleaner from a great one.
A surfactant has two ends: one loves water, the other loves oil. When it meets a greasy surface, it grabs the oil with one end and pulls it into the water with the other. The oil breaks into tiny droplets that can be rinsed away. This process is called emulsification, and it is the heart of every degreaser.
The strongest degreasing surfactants share a few measurable qualities:
Strong emulsification — they hold oil droplets in water so grease does not settle back
Good wetting and penetration — they spread fast and work their way under heavy soil
Low foam — important for spray and machine cleaning, where foam wastes time
The right HLB value — a simple scale (0–20) of how oil-loving or water-loving a surfactant is. For degreasing, a mid-range HLB gives the best balance
Nonionic alcohol ethoxylates (AEO) are the workhorses of modern degreasers. They are strong emulsifiers, penetrate heavy soil well, and are biodegradable. Their HLB value changes with the number of ethylene oxide (EO) groups:
AEO-3 (HLB ≈ 7–8) — more oil-loving; excellent for heavy oils and hydrophobic soils
AEO-7 (HLB ≈ 11–12) — balanced; good wetting and cleaning across general applications
AEO-9 (HLB ≈ 13) — more water-soluble; ideal for detergent and general cleaning
Newer narrow-range ethoxylates offer even better degreasing at lower use levels — often letting formulators cut out hazardous solvents entirely.
Anionic surfactants (such as SLES, LAS and AOS) foam more and cost less. They rarely carry a degreaser alone, but blending them with nonionics boosts cleaning and foam control.
Alkyl polyglycosides (APG) are gentler and highly biodegradable, which makes them a strong choice for food-contact and mild-alkaline cleaning.
Alkylphenol ethoxylates (APEO/NPEO) were once common in degreasers, but the European Union now restricts their use in industrial and institutional cleaning under REACH (Annex XVII, limit 0.1% by weight). Most responsible formulators have already switched to alcohol ethoxylates — a change that did not sacrifice cleaning power.
In practice, a surfactant never works alone. Its power depends on the full formula:
Builders (alkali such as sodium metasilicate or caustic) break down grease chemically while the surfactant does the physical work
Temperature — many nonionics get stronger as temperature rises, up to their cloud point
Agitation and time — mechanical action multiplies surfactant performance
That is why a balanced blend of two or three surfactants plus the right builders almost always beats any single molecule.
If you need a truly strong degreaser, start with a high-quality nonionic alcohol ethoxylate, tune the HLB to your soil type, and pair it with the right alkaline builder. Then test — on your own surfaces, with your own water, on your own equipment.
At Sunly chemical, we supply surfactant blends for degreaser formulations and help customers select and test the right system for their application. Contact us— we are happy to help.
