Views: 0 Author: Site Editor Publish Time: 2026-09-15 Origin: Site
Surfactants are molecules with two ends: one end loves water, the other loves oil and grease. In the wash, the oil-loving end attaches to dirt and grease on the fabric, while the water-loving end pulls the dirt into the water, where it can be rinsed away. Surfactant molecules also group into tiny structures called micelles that trap and carry away oily particles. In addition, they help water spread more easily over fabric and help lift stains off the fibers.
Most liquid laundry detergents combine two large families of surfactants:
Anionic surfactants — the cleaning powerhouses. These carry a negative charge and are strong at removing everyday dirt and grease. Common examples include:
LAS (linear alkylbenzene sulfonate): the most widely used cleaning agent — effective and economical. Its downsides are that performance drops in hard water and it can be more irritating to skin, so it is usually combined with other ingredients.
AES (sodium alcohol ether sulfate): milder, foams well, works better in hard water, and also helps control the product's thickness.
AOS (alpha-olefin sulfonate): strong cleaning, good foaming, tolerant of hard water and biodegradable.
Nonionic surfactants — the gentle helpers. These carry no charge, tolerate hard water well and dissolve easily at low temperatures. Common examples include:
AEO (alcohol ethoxylate): efficient at removing dirt, low-foaming and easy to rinse.
APG (alkyl polyglycoside): made from natural oils and glucose, very mild and biodegradable — often chosen for baby clothes and sensitive-skin formulas.
Small amounts of other ingredients, such as foam stabilizers and thickeners, are added to make the product pleasant to use.
More foam does not mean more cleaning power. Foam feels nice, but cleaning performance comes from the whole formula, not from the amount of foam.
Hard water is a real factor. Some surfactants (such as plain soap) form scum in hard water, while others (such as AES and AEO) keep working. That is why manufacturers blend several types together.
"Natural" and "effective" are not opposites. APG, for example, is plant-derived and mild, yet it is still a capable cleaner.
"Total active matter" is the percentage of surfactants in the product — the substance that actually cleans. Under the Chinese industry standard QB/T 1224-2012 for liquid laundry detergents, regular products must contain at least 15% total active matter, and concentrated products at least 25%. A higher number usually means more cleaning power, but balance matters too: the right combination of ingredients is as important as the total amount.
No single surfactant does everything. A well-designed laundry detergent blends anionic and nonionic surfactants to balance cleaning strength, mildness, foaming and rinsing. Reading the ingredient list and the standard label is the easiest way to choose a product that suits your clothes and your skin.
