Moderate Cosmetic Ingredient

Dimethyl Oxazolidine

INCI: DIMETHYL OXAZOLIDINE

CAS Number
51200-87-4
Function
Preservative / antimicrobial (formaldehyde-releasing biocide)
Safety Rating
MODERATE

Regulatory Status

🇪🇺 EU Status prohibited
🇺🇸 US Status permitted
US Notes Permitted — no specific CFR ban; however, formaldehyde donors are under increasing scrutiny

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
moderate
Sensitization
high

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Formaldehyde-releasing preservative classified as a skin sensitizer (Cat. 1) and carcinogen (Cat. 1B); requires "contains formaldehyde" warning if free formaldehyde exceeds 0.05%; increasingly banned in clean beauty frameworks with additional restrictions in Japan and Sweden.

⚠️
Concern Level: High

Regulatory Flags

potential-allergen preservative eu_cosing_listed

Frequently Asked Questions

Is Dimethyl Oxazolidine safe in cosmetics?

Formaldehyde-releasing preservative classified as a skin sensitizer (Cat. 1) and carcinogen (Cat. 1B); requires "contains formaldehyde" warning if free formaldehyde exceeds 0.05%; increasingly banned in clean beauty frameworks with additional restrictions in Japan and Sweden. The EU classifies Dimethyl Oxazolidine as "prohibited". Safety rating: MODERATE.

Is Dimethyl Oxazolidine allowed in the EU?

Dimethyl Oxazolidine EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.

What does Dimethyl Oxazolidine do in cosmetics?

Dimethyl Oxazolidine functions as: Preservative / antimicrobial (formaldehyde-releasing biocide). It is classified as a cosmetic ingredient in our database. CAS number: 51200-87-4.

What is the Margin of Safety for Dimethyl Oxazolidine?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

Compliance Tools

Check Dimethyl Oxazolidine compliance across multiple jurisdictions:

🔬
Ingredient Decoder
Paste a full ingredient list for instant analysis
 🌸
82 Allergen Checker
Check for EU declarable fragrance allergens
 🧪
Substance Compliance
Check compliance across 55 jurisdictions
 🧮
MoS Calculator
Calculate Margin of Safety using SCCS methodology
 ⚗️
Heavy Metal Limits
Compare limits across jurisdictions

Related Ingredients

Polymethoxy Bicyclic Oxazolidine
Moderate
Benzylhemiformal
Moderate
7-Ethylbicyclooxazolidine
Moderate
Potassium o-Phenylphenate
Poor
Undecylenoyl Sarcosine
Good
Browse all 30,000+ ingredients →
📱

Is Dimethyl Oxazolidine in Your Products?

Scan any product label with Piro — our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.

Try Piro Free →

Analyze Your Full Ingredient List

Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Dimethyl Oxazolidine in your formulation.

Ingredient Decoder MoS Calculator