Ingredient review

PEG/PPG-18/18 Dimethicone

INCI: PEG/PPG-18/18 Dimethicone

A gentle silicone emulsifier that improves product texture and helps ingredients mix without causing irritation.

beautyskincareemulsifier

In plain English

PEG/PPG-18/18 Dimethicone is a silicone-based ingredient that helps oil and water blend together smoothly in skincare products. It also gives formulas a silky, lightweight feel and helps other ingredients spread evenly on your skin. Because it's a large molecule, it sits mostly on the surface and doesn't penetrate deeply, making it very unlikely to clog pores or cause irritation.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

PEG/PPG-18/18 Dimethicone is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging PEG/PPG-18/18 Dimethicone.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic silicone polymer modified with PEG (polyethylene glycol) and PPG (polypropylene glycol) chains, making it water-friendly while retaining silicone's smooth feel.

How it works

It reduces surface tension between oil and water, allowing them to mix into a stable emulsion. It also forms a thin, breathable film on the skin that improves spreadability and leaves a non-greasy finish.

Pros

Gentle and non-irritating

Large molecular size means it stays on the skin's surface, making it unlikely to cause irritation or clog pores.

Improves product feel

Gives a silky, smooth texture that helps serums and creams glide on easily without a sticky residue.

Cons and cautions

Synthetic origin

Some consumers prefer naturally derived emulsifiers; this ingredient is made in a lab and may not fit 'clean' or 'natural' product lines.

Can feel heavy on oily skin

In high concentrations, it may leave a slightly slick feel that some with very oily skin find too rich.

Best for

  • Anyone who wants a lightweight, non-greasy moisturizer or sunscreen
  • People with normal to dry skin who enjoy a silky finish

Use caution if

  • Those strictly avoiding all silicones for personal preference
  • Very oily skin types may prefer lighter emulsifiers in high concentrations

Usage tips

Use in products where a silky, non-greasy finish is desired, like daytime moisturizers or makeup primers.
Pair with lightweight oils or humectants to balance texture for oily skin types.

Safety summary

PEG/PPG-18/18 Dimethicone is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been identified at typical concentrations.

Research notes

Research indicates that PEG/PPG-18/18 Dimethicone is a well-tolerated emulsifier with no evidence of skin sensitization or toxicity in standard tests. Its safety is supported by the Cosmetic Ingredient Review (CIR) panel.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics by the FDA and EU CosIng database at concentrations up to 5%.
Common uses
Moisturizers, Sunscreens, Foundations, Serums
Environmental note
As a silicone derivative, it may not biodegrade quickly; however, its large molecular size reduces environmental mobility.

Good to know

  • PEG/PPG-18/18 Dimethicone is considered safe by major regulatory bodies at typical use levels.
  • It is often used in sunscreens to help chemical filters spread evenly and feel less sticky.

Common questions

What is PEG/PPG-18/18 Dimethicone in beauty products?

PEG/PPG-18/18 Dimethicone is a silicone-based ingredient that helps oil and water blend together smoothly in skincare products. It also gives formulas a silky, lightweight feel and helps other ingredients spread evenly on your skin. Because it's a large molecule, it sits mostly on the surface and doesn't penetrate deeply, making it very unlikely to clog pores or cause irritation.

What does PEG/PPG-18/18 Dimethicone do in a beauty product?

It reduces surface tension between oil and water, allowing them to mix into a stable emulsion. It also forms a thin, breathable film on the skin that improves spreadability and leaves a non-greasy finish.

Is PEG/PPG-18/18 Dimethicone safe for most people?

PEG/PPG-18/18 Dimethicone is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, and no significant safety concerns have been identified at typical concentrations.

Who should be careful with PEG/PPG-18/18 Dimethicone?

Those strictly avoiding all silicones for personal preference Very oily skin types may prefer lighter emulsifiers in high concentrations

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Dimethicone and DerivativesOpenEU CosIng Database - PEG/PPG-18/18 DimethiconeOpenPubMed - Silicone Emulsifiers in CosmeticsOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.