A cleanser lives or dies on its surfactant system. The surfactants decide the foam, the skin feel, the pH & the mildness, which means they decide whether a customer comes back. A brand that picks a cleanser by the label copy rather than by the base is choosing the wrapper before the product.
This article covers the surfactant families a brand can brief, the trade between foam & mildness, the pH & preservation points that keep the base safe, & the claims a cleanser can carry without overreaching. By the end you should be able to specify a surfactant system that matches your positioning rather than the supplier's default.
Why the surfactant system decides the product
The surfactant is the working ingredient in a cleanser. It is what removes oil & residue from the skin, & the balance between removal & comfort is set by which surfactants are used & in what proportion. Everything else in the formula is support: humectants, thickeners, preservatives, scent.
The practical consequence is that two cleansers that look identical on a shelf can feel entirely different, because the surfactant blend underneath is different. The foam, the tightness after rinsing, the scent strength & the price all trace back to that blend.
For a brand, the system is also the claim. A sulphate-free or an amino acid claim is a claim about the surfactants, & it can only be made if the base is built for it. Briefing a standard system & adding the word "gentle" to the copy is not a claim the market will accept.
The main surfactant families
The anionic group carries the wash. Sodium laureth sulfate or sodium lauryl sulfate gives the dense foam most buyers expect, & it is the cheapest route to a familiar feel. The cost is tightness on some skin, which is why it is rarely used alone in a face cleanser.
The amphoteric group, built on cocamidopropyl betaine, is the usual partner. It lifts the foam, cushions the anionic & improves skin tolerance, which is why most liquid cleansers are a blend of the two rather than one.
The non-ionic group is the mild option used where foam matters less than comfort, often in baby or sensitive formats. It is weaker at removing oil, so it is paired rather than relied on alone, & it is the base under many sulphate-free claims.
Amino acid & sulphate-free systems
The amino acid surfactants, such as sodium cocoyl glutamate or sodium cocoyl glycinate, are the mild end of the scale. They foam softer, feel less stripping & sit well with a sensitive positioning, which is why they appear in the higher tiers & in baby formats.
Sulphate-free is not one system; it is the absence of SLS & SLES, built instead on amino acid, alkyl polyglucoside or betaine blends. The word is American spelling in our files & it stays that way across the range, because the claim travels on the exact wording.
For a brand, the choice is a price & feel trade. An amino acid base costs more & foams less loudly than a sulfate system, but it supports a gentleness claim that a standard blend cannot. The brief should name the system, not the hope.
Foam, viscosity & the feel
Foam is the signal the customer reads as clean. A weak foam feels like the product is not working, even when it is, so the surfactant blend is tuned to a foam the channel expects, whether that is a rich lather or a light cream.
Viscosity is the second feel cue. A cleanser that is too thin feels cheap; one that is too thick will not pump. The viscosity is set by a thickener matched to the surfactant, not by adding more of the same, & it must hold across the temperature range the pack will meet.
For a brand, the feel should be agreed at the golden sample, because foam & viscosity are sensory & cannot be read from a spec sheet. A sample approved on paper & rejected in the hand is a reformulation the brand pays for twice.
pH & skin tolerance
The skin surface is mildly acidic, & a cleanser that sits far above that pulls the feel toward tightness. Most liquid face cleansers are balanced in a mild range, but the exact target depends on the surfactant & the claim, & it is written into the release spec.
The pH also protects the preservative. Many preservation systems depend on the uncharged fraction of a weak acid, so a pH that drifts high removes part of the protection even when the batch passes its own paper limits. The pH window is a safety line, not a preference.
For a brand, the pH should be a measured release criterion, checked across the run rather than once at the start, because a bulk that heats during filling can shift. A single opening check misses the part the customer receives.
Mildness & the tear-free claim
Mildness is a formulation outcome, not a word. It comes from the surfactant choice, the concentration & the buffering, & it is what lets a brand say the product is gentle. The tear-free claim is a stricter version, usually reserved for baby or kids formats, & it needs the base to support it.
The claim must not drift into a medical promise. A cleanser can say it is mild or tear-free; it cannot say it soothes a condition or acts on the skin barrier in a medical sense. The line is drawn by wording, & the notification enforces it.
For a brand, mildness should be built into the base & proven at the sample, not added to the copy after the formula is fixed. A claim with no base behind it is a rewrite waiting at the regulator.
Preservation in a water-rich base
A cleanser is mostly water, which makes it a growth medium if the preservation fails. The preservative system is matched to the pH, the pack & the rinse-off nature of the product, & it is challenged before release rather than assumed.
The trap is a system chosen for a different base. A preservative that works in a cream at pH 5.5 may not hold in a cleanser at a higher pH or in a wide-mouth jar with more air contact. The pack format changes the risk, so the preservative is set with the pack in view.
For a brand, the preservation should be part of the brief, because a last-minute change to a "natural" preservative can shift the challenge result & the shelf life. The stability & preservation studies are what the claim rests on, & they are run on the actual base.
Fragrance & the IFRA line
A scented cleanser carries the IFRA duty. The fragrance must carry a certificate & a declaration against the 26 named allergens, because those duties travel with the scent regardless of the product's job. A rinse-off cleanser sits at the rinse-off limit, which is more forgiving than a leave-on, but it is still a duty.
The load should be set for the format. A scent tuned for a leave-on lotion is not automatically safe at the same level in a cleanser that the user holds near the face & eyes. The certificate should name the product type, not only the compound.
Where the base contains ethanol or a fragrance compound, the flash point & the transport class are part of the batch record, because a scented cleanser shipped by air must clear the same dangerous-goods basis as the sample. The fragrance lot is logged, not assumed.
Packaging matched to the bulk
The pack is matched to the viscosity & the surfactant, not borrowed from another product. A pump chosen for a thin lotion will not move a gel cleanser; a tube chosen for a cream will not suit a free-flowing liquid. The pack is part of the product feel.
The cap & the closure matter for a product used with wet hands. A cap that leaks or a closure that sticks turns a good base into a returned pack, & those faults show in the field rather than in the lab. The pack is tested with the bulk, not after it.
For a brand, the pack should be briefed with the bulk spec, because a last-week change to the bottle is a tooling delay & a mismatch. The dieline & the closure are set once, with the base, so the range reads as one.
Claims you can make on a cleanser
A cleanser can claim to cleanse, to remove makeup or residue, to leave skin feeling fresh or soft, & to be gentle or mild. Those are cosmetic & defensible if the base supports them. The claim set is written with the formula, not after it.
What a cleanser must not claim is an effect on a condition. It cannot say it works on a condition, changes the skin's structure or implies a medical result. The boundary is wording, & the market checks it at notification.
For a brand, the claim set should be matched to the surfactant system, because a sulphate-free or amino acid claim only holds if the base is built for it. The pH & viscosity points that each system must hold are set out in our pH & viscosity control piece, & the surfactant families are covered in our amino acid cleanser guide.
Sampling & the golden sample
The golden sample is where foam, viscosity & scent are agreed, & it should be made on the intended line with the intended pack so the release criteria are real. A sample made by hand tells you the formula cleans; it does not tell you the pump will dispense it.
The sample also settles the sensory points a spec cannot: the tightness after rinsing, the scent strength, the feel in the hand. Those are the points a customer judges, & they should be fixed at the sample so the reorder is compared to them, not to a memory.
For a brand, the sample is the reference the factory releases against, so it should be kept & opened beside the reorder bulk. A cleanser released without a sample is a cleanser the brand has not actually specified.
Surfactant families compared
The table below compares the surfactant families a cleanser brief usually has to choose between, so the brand can match the system to the foam & the claim it wants to carry. It is a planning comparison, not a specification, & the final blend is set by the formula & the pack.
| System | Foam & feel | Mildness | Where it fits |
|---|---|---|---|
| Anionic, SLES or SLS | Rich, fast foam | Lowest of the group | Value body & hand wash |
| Anionic, sulphate-free isethionate | Creamy, dense foam | Gentler than SLES | Mild foaming facial wash |
| Amino acid, glutamate or glycinate | Soft, lower foam | High, near-skin pH | Sensitive & premium facial |
| Amphoteric betaine | A booster, not a base alone | Good as a partner | Paired into most mild systems |
| Non-ionic glucoside | Low foam, silky | Very good | Gentle & low-foam lines |
| Sulphate-free blend | Tunable foam | Good with the right partner | Brands avoiding the SLS label |
| Syndet bar base | Dense, quick lather | Set by the pH system | Solid & travel formats |
The comparison is a starting point, not a formula brief. Which system suits a brand, & how the blend holds its foam & pH across the run, should be confirmed with the factory on the actual pack, because the same family behaves differently in a pump bottle than in a bar.
What to put in the brief
Name the surfactant system before the formula is written, because that single choice sets the foam, the feel, the pH & the claim. State the pH window, the preservation approach, the fragrance & its IFRA level, & the pack matched to the bulk.
- The surfactant family, named as anion, amphoteric, non-ionic or amino acid.
- The foam target, matched to the channel the product will sell in.
- The viscosity window, held across the temperature range the pack meets.
- The pH band, written as a measured release criterion across the run.
- The preservation system, set with the pack format in view.
- The fragrance & IFRA certificate level, named for the rinse-off format.
- The pack, matched to the bulk viscosity & the wet-hand use.
- The claims, matched to the system so the wording holds at notification.
Then keep the golden sample as the season reference, so the reorder is compared to the agreed feel rather than to a description. A cleanser sampled once is a cleanser the factory reinterprets each run.
Where our capability fits
We build the cleanser from the surfactant system out, with the pH, the preservation & the fragrance set against the pack rather than against a default, & we make the golden sample on the intended line so the release criteria are real. The system is named at the brief, not guessed at the fill.
We work with brands on private label (your brand on a proven base), OEM/ODM contract manufacturing & full custom formula development, & the cleanser discipline is the same across all three. Our lines include an amino acid facial cleanser, a firming face cream & a hyaluronic acid serum capsule range, all produced with the same pH & batch control.
Tell us the system & the claims you want to carry, & we will come back with a base, a pack & a sample that match. Start at our inquiry page, email capsulebiotech@163.com, or message the right team on WhatsApp: Capsule Series (capsules only) +86 158-7655-5319, Cosmetics Series (serum, hair care, body care, fragrance) +86 158-7655-5319. The surfactant choice is covered in our amino acid cleanser guide.
General manufacturing information, not regulatory or legal advice. Surfactant claims, pH windows, IFRA duties & notification rules vary by market & by product, & the applicable requirements should be confirmed for each destination before a cleanser is placed on sale.