Tosylamide/Formaldehyde Resin

AKA: Tosylamide Formaldehyde Resin, Nail Polish Resin

Plant-Derived Synthetic

Occlusive

Not Clean

OriginSynthesized from p-toluenesulfonamide and formaldehyde, belonging to the sulfonamide-formaldehyde resin chemical family. Produced through condensation polymerization of tosylamide with formaldehyde under controlled conditions.

Benzenesulfonamide, 4-methyl-, polymer with formaldehyde

CAS #

25035-71-6

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Allergen Warning

⚠️ Formaldehyde

Functions

Film Forming

Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.

Plasticiser

Anti-Inflammatory

Moisturizing

Fights Acne

Creates protective layer

Adds flexibility

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed1 review →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

EWG

CIR

Safe as used

Pregnancy

Restricted By

Credo Beauty Sephora Clean at Sephora Target Clean Whole Foods Premium Body Care The Detox Market Ulta Conscious Beauty Beauty Heroes CVS Clean Beauty MADE SAFE EWG VERIFIED

CIR Safety Findings

Not a Sensitizer

6 studies / 6 not sensitizing / plus 4 case reports (CIR 177)

Not Phototoxic

Product formulation test found no phototoxicity in the CIR safety assessment (CIR 177)

Eye Irritant in Testing

4 studies / 4 irritating / reactions slight to severe (CIR 177)

Mixed Skin Irritation Results

13 studies / 5 irritating / 8 not irritating / reactions minimal to mild (CIR 177)

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Verified Jun 2026

Data: CosIng · EWG · CIR