HDI/PEI-45/SMDI Crosspolymer
AKA “Hexamethylene diisocyanate crosspolymer
Synthetic
Ingredient Facts
Hdi/pei-45/smdi crosspolymer
AKA: Hexamethylene diisocyanate crosspolymer
Synthetic · Absorbent · EWG: 4
Synthetic
Synthetic
Clean
Helps the formula feel smooth and lightweight while absorbing moisture, creating a comfortable texture that glides on skin without feeling heavy.
Form
Liquid
State
Solid
See origin →
Functions
Absorbent
Plasticiser
Absorbs excess oil
Adds flexibility
Traditional Use
A synthetic crosspolymer developed in the late 20th century using HDI (hexamethylene diisocyanate) and SMDI (semi-alicyclic methylene diphenyl diisocyanate) chemistry. Designed as a film-forming, binding, and texture-modifying agent in modern skincare and cosmetic products.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR