Ingredient review

PEG/PPG-35/40 Copolymer

INCI: PEG/PPG-35/40 Copolymer

A safe, synthetic thickener that improves product texture and stability, but offers no active skincare benefits.

beautyskincarethickener

In plain English

PEG/PPG-35/40 Copolymer is a man-made ingredient that helps give skincare products a smooth, spreadable texture. It acts like a gentle glue that holds oil and water together, so your lotion or serum doesn't separate. It also makes the product feel silky on your skin without being greasy. Think of it as a helper ingredient that makes the formula work better, not an active ingredient that treats your skin.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 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-35/40 Copolymer 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-35/40 Copolymer.
  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

PEG/PPG-35/40 Copolymer is a synthetic polymer made from repeating units of ethylene oxide (PEG) and propylene oxide (PPG). It belongs to a family of ingredients called copolymers, which are designed to improve the feel and stability of cosmetic formulas. It is water-soluble and often used to thicken products or help other ingredients mix evenly.

How it works

In a cosmetic product, this copolymer acts as a thickener and emulsifier. It increases the viscosity of water-based formulas, giving them a richer, more luxurious feel. As an emulsifier, it helps oil and water blend together so the product stays uniform. It also forms a thin, non-occlusive film on the skin that can temporarily smooth the surface and reduce water loss, though this effect is mild.

Pros

Improves product feel

Makes lotions and serums feel silky and smooth, enhancing the user experience without adding greasiness.

Low irritation risk

Generally well-tolerated even on sensitive skin, with very low reported rates of irritation or allergic reactions.

Cons and cautions

No active benefit

This ingredient does not hydrate, exfoliate, or treat skin concerns—it only improves formula texture and stability.

Synthetic origin

Derived from petroleum-based chemicals, which may be a concern for those seeking natural or biodegradable ingredients.

Best for

  • Anyone who wants a stable, well-textured product
  • People with normal to oily skin looking for lightweight formulas

Use caution if

  • Those with known sensitivity to PEG compounds (rare)
  • Strict 'clean beauty' users avoiding all synthetic ingredients

Usage tips

Use products with this ingredient as directed—no special precautions needed.
If you have very sensitive skin, patch test a new product on your inner arm before applying to your face.

Safety summary

PEG/PPG-35/40 Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as with any synthetic ingredient, individuals with extreme sensitivities may experience mild reactions. Regulatory bodies like the CIR and EU SCCS have approved its use.

Research notes

Research on PEG/PPG copolymers focuses on their safety and function as emulsifiers and thickeners. Studies indicate low acute toxicity and skin irritation. No significant evidence links this specific copolymer to health concerns when used as directed in rinse-off or leave-on products.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics by the FDA (as part of generally recognized safe ingredients) and the EU Cosmetics Regulation. The Cosmetic Ingredient Review (CIR) panel has reviewed PEG/PPG copolymers and found them safe at current usage levels.
Common uses
Serums, Moisturizers, Cleansers, Sunscreens
Environmental note
As a synthetic polymer, this ingredient is not biodegradable and may persist in the environment. However, it is used in small amounts and is not considered a major pollutant.

Good to know

  • PEG/PPG copolymers are common in many cosmetics and are considered safe by global regulators at typical use levels.
  • The numbers 35/40 refer to the average chain lengths of the PEG and PPG blocks, which affect the ingredient's solubility and thickness.

Common questions

What is PEG/PPG-35/40 Copolymer in beauty products?

PEG/PPG-35/40 Copolymer is a man-made ingredient that helps give skincare products a smooth, spreadable texture. It acts like a gentle glue that holds oil and water together, so your lotion or serum doesn't separate. It also makes the product feel silky on your skin without being greasy. Think of it as a helper ingredient that makes the formula work better, not an active ingredient that treats your skin.

What does PEG/PPG-35/40 Copolymer do in a beauty product?

In a cosmetic product, this copolymer acts as a thickener and emulsifier. It increases the viscosity of water-based formulas, giving them a richer, more luxurious feel. As an emulsifier, it helps oil and water blend together so the product stays uniform. It also forms a thin, non-occlusive film on the skin that can temporarily smooth the surface and reduce water loss, though this effect is mild.

Is PEG/PPG-35/40 Copolymer safe for most people?

PEG/PPG-35/40 Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as with any synthetic ingredient, individuals with extreme sensitivities may experience mild reactions. Regulatory bodies like the CIR and EU SCCS have approved its use.

Who should be careful with PEG/PPG-35/40 Copolymer?

Those with known sensitivity to PEG compounds (rare) Strict 'clean beauty' users avoiding all synthetic ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of PEG/PPG CopolymersOpenEuropean Chemicals Agency (ECHA) - PEG/PPG Copolymer InformationOpenPubMed - Safety of PEG/PPG Copolymers 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.