Ingredient review

Bis-Aminopropyl Dimethicone/IPDI Copolymer

INCI: BIS-AMINOPROPYL DIMETHICONE/IPDI COPOLYMER

A durable silicone film former that boosts water resistance and wear time without feeling heavy or sticky.

beautyskincarehaircarefilm former

In plain English

This ingredient is a type of silicone that forms a thin, flexible, invisible film on your skin or hair. Think of it like a breathable raincoat — it helps other ingredients stay put longer and keeps water from washing them away. It's commonly used in sunscreens to improve water resistance and in long-wear makeup to prevent smudging. Despite being a polymer, it doesn't feel heavy or greasy, and it's generally well-tolerated even by sensitive skin.

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

Bis-Aminopropyl Dimethicone/IPDI 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.

Step 1Start with the score, then check the irritation and clogging risk before judging Bis-Aminopropyl Dimethicone/IPDI Copolymer.
Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
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 copolymer made by combining a silicone (dimethicone) with a polyurethane-like compound (IPDI). It is designed to create a flexible, water-resistant film.

How it works

When applied, the copolymer molecules link together to form a thin, even film on the surface of the skin or hair. This film physically blocks water and sweat from reaching the underlying product layers, extending wear time and enhancing water resistance. It also helps smooth the hair cuticle and reduce frizz.

Pros

Excellent water resistance

Helps sunscreens and makeup stay effective even when you sweat or swim, reducing the need for frequent reapplication.

Flexible, comfortable feel

Unlike some older film formers, this silicone copolymer creates a film that moves with your skin, so it doesn't crack or feel tight.

Cons and cautions

Requires thorough removal

Because it forms a strong water-resistant film, a simple splash of water or gentle cleanser may not remove it completely. You'll likely need an oil-based cleanser or micellar water to avoid residue.

Potential buildup on hair

If used frequently in styling products, it can accumulate on hair strands, leading to dullness or heaviness unless you use a clarifying shampoo periodically.

Best for

Anyone looking for longer-lasting sunscreen or makeup
People with oily or combination skin who want a transfer-proof finish

Use caution if

Those who prefer minimal, easily removable products and dislike double cleansing

Usage tips

Use an oil-based cleanser or micellar water first to break down the film, then follow with your regular water-based cleanser.

For hair, alternate with a clarifying shampoo every 1–2 weeks to prevent buildup.

Apply sunscreen containing this ingredient at least 15 minutes before water exposure to allow the film to form properly.

Safety summary

Considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin. The main practical concern is removal, not toxicity.

Research notes

There is limited independent research specifically on this copolymer, but its components (dimethicone derivatives and IPDI) are well-studied and generally recognized as safe by cosmetic safety panels. Its film-forming and water-resistance properties are supported by formulation science.

Common label clues

Typical concentration: 0.5% to 5%
Regulatory status: Approved for use in cosmetics in the EU, US, and many other regions. No specific concentration restrictions are common, but it is typically used at low levels (under 5%).
Common uses: Long-wear makeup, Sunscreen, Hair styling products, Water-resistant skincare
Environmental note: As a silicone-based polymer, it may not be biodegradable. However, its low usage concentration and the fact that it is often removed during wastewater treatment reduce its environmental impact compared to some other silicones.

Good to know

This ingredient is often listed near the end of an ingredient list because it's used at low concentrations.
It is not the same as dimethicone — it's a larger polymer with different film-forming properties.

Common questions

What is Bis-Aminopropyl Dimethicone/IPDI Copolymer in beauty products?

What does Bis-Aminopropyl Dimethicone/IPDI Copolymer do in a beauty product?

Is Bis-Aminopropyl Dimethicone/IPDI Copolymer safe for most people?

Who should be careful with Bis-Aminopropyl Dimethicone/IPDI Copolymer?

Those who prefer minimal, easily removable products and dislike double cleansing

Research sources

CosIng - European Commission ingredient databaseOpen Personal Care Council - Silicones SafetyOpen PubMed - Silicone polymers 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.