HDI/PEI-45/SMDI Crosspolymer
AKA “Hexamethylene diisocyanate crosspolymer
Synthetic
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Ingredient Facts
Hdi/pei-45/smdi crosspolymer
AKA: Hexamethylene diisocyanate crosspolymer
Synthetic · Absorbent | Plasticiser · EWG: 4
Plant-Derived
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
Plant-Derived
Synthetic. Synthesized from aliphatic isocyanates (HDI, PEI) and alicyclic diisocyanate (SMDI) as starting materials. Produced through polymerization and crosslinking reactions to create a branched polymer network structure.
Function
Absorbent | Plasticiser
Benefits
Absorbent
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
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
EWG Score4
CIR Safety Findings
medical-approval, all-shades-safe, Not a Sensitizer
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR