SILICONE
Cyclopentasiloxane
- silicone
A light, fast-evaporating silicone that spreads other ingredients then leaves. It gives serums their weightless glide.
- products in our library
- 361
- of researched products
- 5%
- on the label, in our hair oils
- usually #1
- most common in
- Finisher: oil
- in water
- Volatile
At a glance
Four things worth knowing about how this ingredient behaves on hair.
How much of it is left on hair between washes.
What it takes to get it off the hair again.
How much easier it makes a comb pass.
How much the class is felt on fine hair.
| Property | Level | Out of |
|---|---|---|
| Buildup risk | None left behind | 1 of 5 |
| Rinse-out behaviour | Rinses clean | 5 of 5 |
| Slip | Light | 3 of 5 |
| Weight | Light | 1 of 5 |
What it does for a formula
What Cyclopentasiloxane does
The general function first, then how the role changes by product type where we have researched it.
Fills the gaps between lifted cuticle scales so light reflects evenly.
Lowers the drag a comb feels, which is most of what "detangling" means.
Smooths the feel of the strand without adding hold or cleaning.
It carries the formula onto the hair and then leaves.
Charge
Carries no charge, so it neither clings to hair nor is pushed away by it. Nonionic ingredients are the mild, pH-tolerant workhorses of a formula.
Solubility
Evaporates after application rather than staying on the hair, so it leaves nothing behind to remove.
Where it appears
Where it appears
One row per product category in our library: how many products list it, what share of that category that is, and where it typically sits on the label.
| Product type | How common | Typical position on label ? |
|---|---|---|
Finisher: oil
72 products
|
leading · #1 | |
Leave-in
57 products
|
leading · #3 | |
Finisher: serum
43 products
|
leading · #1 | |
Conditioner
33 products
|
secondary · #9 | |
Heat protectant
24 products
|
leading · #2 | |
Mask / treatment
24 products
|
supporting · #7 | |
Finisher: shine spray
23 products
|
leading · #2 | |
Styler: hairspray
22 products
|
supporting · #8 | |
Styler: curl cream
17 products
|
supporting · #4 | |
Dry shampoo
8 products
|
secondary · #13 |
13 more product types
| Product type | How common | Typical position on label ? |
|---|---|---|
Styler: smoothing cream
8 products
|
leading · #3 | |
Finisher: anti frizz finish
6 products
|
leading · #2 | |
Shampoo
5 products
|
secondary · #21 | |
Styler: texture spray
4 products
|
supporting · #5 | |
Co-wash
3 products
|
supporting · #5 | |
Styler: gel
2 products
|
leading · #3 | |
Styler: lotion
2 products
|
supporting · #5 | |
Styler: mousse
2 products
|
secondary · #12 | |
Styler: refresh spray
2 products
|
secondary · #11 | |
Finisher: end oil
1 product
|
leading · #3 | |
Scalp treatment
1 product
|
leading · #3 | |
Styler: paste
1 product
|
supporting · #5 | |
Styler: volumizer
1 product
|
leading · #2 |
| Product type | Products | Share of category | Median position | Earliest position | Band |
|---|---|---|---|---|---|
| Finisher: oil | 72 | 26% | 1 | 1 | leading |
| Leave-in | 57 | 8% | 3 | 1 | leading |
| Finisher: serum | 43 | 31% | 1 | 1 | leading |
| Conditioner | 33 | 3% | 9 | 1 | secondary |
| Heat protectant | 24 | 12% | 2 | 1 | leading |
| Mask / treatment | 24 | 4% | 7 | 2 | supporting |
| Finisher: shine spray | 23 | 22% | 2 | 1 | leading |
| Styler: hairspray | 22 | 9% | 8 | 3 | supporting |
| Styler: curl cream | 17 | 7% | 4 | 2 | supporting |
| Dry shampoo | 8 | 6% | 13 | 4 | secondary |
| Styler: smoothing cream | 8 | 10% | 3 | 2 | leading |
| Finisher: anti frizz finish | 6 | 19% | 2 | 1 | leading |
| Shampoo | 5 | 0% | 21 | 6 | secondary |
| Styler: texture spray | 4 | 4% | 5 | 4 | supporting |
| Co-wash | 3 | 3% | 5 | 4 | supporting |
| Styler: gel | 2 | 1% | 3 | 3 | leading |
| Styler: lotion | 2 | 6% | 5 | 2 | supporting |
| Styler: mousse | 2 | 1% | 12 | 7 | secondary |
| Styler: refresh spray | 2 | 6% | 11 | 2 | secondary |
| Finisher: end oil | 1 | 13% | 3 | 3 | leading |
| Scalp treatment | 1 | 0% | 3 | 3 | leading |
| Styler: paste | 1 | 1% | 5 | 5 | supporting |
| Styler: volumizer | 1 | 1% | 2 | 2 | leading |
We have not researched differences by product type yet. The reading below comes from where it sits on the labels in our library.
Position footprint
Every listing in our library, by position on the label.
| Positions | Zone | Listings |
|---|---|---|
| 1-3 | Leading | 208 |
| 4-8 | Supporting | 80 |
| 9-15 | Secondary | 36 |
| 16-25 | Lower | 30 |
| 26+ | Trace | 7 |
How to read this
US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order.
So position tells you about relative amount only above that line, and we never convert a position into a percentage.
Who should pay attention
Formulation guidance for specific hair conditions, limited to the label positions where it applies. It is not a conclusion about any finished product, or about you.
It leaves the hair by evaporating rather than by being washed off, so it is not part of what accumulates.
A surface film slows how quickly humidity reaches the cortex, which is what limits swelling-driven frizz in damp air.
A cyclic silicone evaporates after it has spread the formula, so it carries the other ingredients without leaving weight behind.
Silicones lay a smooth film along the cuticle, which lowers combing friction and flattens the surface irregularities that read as frizz.
Read from this ingredient’s chemical class. Where we have researched the ingredient itself, that reading replaces the class one.
Why it matters to shoppers
What seeing this ingredient tells you, what it does not, and the limits of our own method.
- smoothing with nothing left behind
- slip and surface smoothing
- a softer feel
- nothing left on the hair
- an exact safety score (we do not publish one for any ingredient)
- how a finished product performs, which depends on the whole formula, not one line of it
- the exact percentage in a bottle, because label position never converts into a number
- a primary silicone near the top of the ingredient list in our hair oils
- it was on the printed ingredient list of every product we counted (we read labels, not marketing copy)
- it is a carrier, not something left on the hair
- buildup, since the water-soluble ones rinse out with ordinary shampoo
- that a product is right or wrong for you
We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
Why some people avoid it
A conditioning agent that lays a smooth film on the cuticle, which is what delivers slip, shine and frizz control.
The water-insoluble ones need a detergent wash to remove, so on a routine that avoids detergent they accumulate and can leave hair feeling coated. That is the curly-method objection, and it is about buildup rather than harm. Water-soluble silicones rinse out and do not raise it.
Where regulators stand: Permitted. Some cyclic silicones are restricted in the EU on environmental grounds (they persist in waterways), not for anything to do with skin.
A formulation preference, not a regulatory finding
Commonly paired with
The ingredients that most often appear alongside this one in our library. We leave out the near-universal ones, because they pair with everything and tell you nothing.
- Dimethicone · 177
- Dimethiconol · 155
- Hexyl Cinnamal · 107
- Argania Spinosa Kernel Oil · 88
- Phenyl Trimethicone · 82
- Citronellol · 77
- Behentrimonium Chloride · 77
- Tocopheryl Acetate · 75
- Cocos Nucifera (Coconut) Oil · 73
- Benzyl Salicylate · 72
The number beside a name is how many products in our library list both.
These ingredients tend to appear together to smooth the surface, give it a scent, and soften the strand.
Found in these products
The most prominent placements first. The badge is the position on that product’s own ingredient list.
Alterna · Finisher
Caviar Anti-Aging Restructuring Bond Repair 3-in-1 Sealing Serum
#1 on the label · $22.35/oz
Alterna · Finisher
Caviar Anti-Aging Smoothing Anti-Frizz Nourishing Oil
#1 on the label · $16.32/oz
amika · Heat protectant
blockade heat protectant serum
#1 on the label · $18.82/oz
amika · Leave-in
The Wizard Detangling Primer
#1 on the label · $6.40/oz
Aussie · Finisher
Miracle Curls Curl Defining Oil
#1 on the label · $4.80/oz
Aussie · Finisher
Miracle Moist Intense Hydration Oil
#1 on the label · $2.11/oz
Bed Head · Heat protectant
A Glass Act Heat & UV Shield Oil
#1 on the label · $5.34/oz
BioSilk · Leave-in
Silk Therapy Lite
#1 on the label · $5.76/oz
CHI · Finisher
Deep Brilliance Shine Serum Lightweight Leave-In Treatment
#1 on the label · $2.80/oz
CHI · Leave-in
Enviro Smoothing Serum
#1 on the label · $7.47/oz
Coco & Eve · Finisher
Like A Virgin Miracle Hair Elixir
#1 on the label · $9.93/oz
Creme of Nature · Finisher
Argan Oil Anti Humidity Gloss Shine Mist
#1 on the label · $2.43/oz
See all 361 products in the library that list Cyclopentasiloxane
Identity
What this entry is, and what our references call it.
Cyclopentasiloxane
- CAS 541-02-6
- PubChem 10913
- emollient
- cyclomethicone
- cyclopentasiloxane
For your hair?
Whether Cyclopentasiloxane matters for your hair depends on your hair.
the 4th most-listed silicone in our libraryWhat this ingredient does, and where it sits on the labels we have researched.
A verdict on any product that contains it, and never a safety grade.
We do not physically test your hair. Everything above comes from the ingredient lists in our library and from published references. The consultation is what turns it into a plan.
References
Sourced Backed by a manufacturer or regulatory source.
This ingredient
- Manufacturer or regulatory PubChem : Compound identity: CID 10913, CAS 541-02-6, C10H30O5Si5 · accessed 2026-08-28
How this page was made
- Every number above is counted from the ingredient lists in our own product library: 361 of 6816 researched products list this ingredient. Nothing on this page is written per ingredient.
- The dots are levels, not scores. Each one comes from what kind of ingredient it is (its chemical class, charge and solubility) or from where it sits on the labels we have.
- US labelling rules put ingredients above 1% in descending order of amount; below 1% they may be listed in any order. Position tells you about relative amount only above that line, and we never convert a position into a percentage.
- The prominence bands (leading, supporting, secondary) are the same ones the product pages use to read a single label, applied here to the median position across a category.
- We do not publish safety scores or hazard grades. Where a regulator has published a restriction or a use condition, we state it and cite it; otherwise we describe what the ingredient does and stop.
- Identifiers and references appear only when a published source is attached to this entry. Without one, we leave the row out rather than fill it in.
- This is cosmetic information, not medical advice, and nothing here diagnoses or treats a health condition.
- Entry last updated 2026-09-22. Product-page methodology: the product library.
