Common Name(s): Hema acetoacetate,hema polyurethane nail gel polymer,uv-curable nail resin

CAS Number: N/a

DESCRIPTION

What It Does: Provides the uv/led-curable nail gel film with strong natural nail adhesion, high gloss, and flexible toughness that withstands daily use without chipping or cracking.

Why It's Used: Hema-terminated polyurethanes are the principal curable resins in professional gel nails — the hema terminus provides simultaneous uv reactivity and keratin adhesion that acrylate-only systems cannot match for durability.

How It Works: Hema end-groups polymerise under uv/led (365/405 nm) forming c-c crosslinks. the polyurethane midblock soft segment provides elastic flexibility preventing nail-flex cracking; hema hydroxyls h-bond to nail keratin providing adhesion. ipdi or tmhdi hard segments provide hydrolytic resistance for multi-week wear.

Typically Found In: Gel nail polish,nail extensions,uv/led nail products

TECHNICAL DETAILS

Primary Category: Active ingredient – cosmetic active

Secondary Functions: Skin conditioning

Application Areas:

Typical Concentration Range: 20%–80%

SOURCING & ETHICS

Vegan Status: Conditional - supplier confirmation required

Halal Status: Unverified - supplier confirmation required

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier. [audit 2026-07-29 rev2: the record's own source_notes does not assert a non-animal origin, or instructs the reader to verify with the supplier; "yes" asserts knowledge the record does not hold. determination requires shariah-panel sign-off.]

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Good safety profile at recommended concentrations. ewg score: 1–2.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Midblock composition determines gel flexibility: polycaprolactone midblocks provide highest flexibility for gel base/top coats; poly(butanediol) midblocks provide intermediate stiffness; adipate midblocks give stiffer finish. formulators select by midblock type.

Last Verified: 2026-03-12

Primary Sources: Cosing database,hema polyurethane uv-curable nail gel review