
General Description:
Imidazolidinyl Urea is a widely used preservative and antimicrobial agent in the cosmetic and personal care industry. It is a white, crystalline powder that is water-soluble and functions primarily as a formaldehyde-releasing agent. It is known for its effectiveness in preventing microbial growth, thereby extending the shelf life of products. Imidazolidinyl Urea is commonly found in a variety of formulations, from skin care to hair care products, due to its broad-spectrum preservative properties. It is available for bulk supply, making it a common ingredient in large-scale cosmetic manufacturing.
Uses in the Cosmetics Industry:
Imidazolidinyl Urea is used in:
Skincare products such as creams, lotions, and serums to prevent microbial contamination.
Hair care products, including shampoos and conditioners, to ensure product stability and safety.
Cosmetics and makeup products to preserve the formulation and extend product shelf life.
Body care items like deodorants and body lotions to maintain cleanliness and prevent bacterial growth.
Due to its broad-spectrum preservative action, it is commonly included in products that require long-term storage or that are exposed to repeated use, such as in pump bottles and jars.
Side Effects & Hazards:
While Imidazolidinyl Urea is effective as a preservative, it can cause skin irritation or allergic reactions in some individuals, particularly those with sensitive skin or a history of allergies to formaldehyde-releasing agents. It is important to note that this ingredient slowly releases formaldehyde, a substance known for its potential to cause irritation, sensitization, or even allergic reactions in sensitive individuals. Prolonged exposure to formaldehyde has been linked to certain health concerns, such as skin irritation and respiratory issues, so it is regulated in cosmetic formulations to limit concentrations and ensure safety.
During manufacturing, proper safety precautions, including the use of gloves and goggles, should be taken to avoid direct skin or eye contact with the powder. It is also important to store products containing Imidazolidinyl Urea in sealed containers in a cool, dry, and well-ventilated area to prevent exposure to moisture, which could lead to the release of formaldehyde at higher concentrations.
Safety & Regulatory Considerations:
Imidazolidinyl Urea is regulated by cosmetic safety authorities such as the FDA and EU Cosmetics Regulation, with recommended concentration limits typically around 0.6%. It is essential for manufacturers to ensure that its use complies with local regulations and product safety standards. For sensitive skin formulations, some manufacturers may opt for alternative preservatives to avoid the potential risks associated with formaldehyde-releasing agents.
CAS Number: 39236-46-9
INCI Name: Imidazolidinyl Urea
Composition: Organic compound, a derivative of imidazolidine with a urea group attached; used as a preservative in cosmetic formulations
Purity Grade: Cosmetic/Pharmaceutical Grade
Appearance: White to off-white crystalline powder or granular solid
Solubility: Soluble in water; sparingly soluble in alcohol
Preservation: Used primarily as an antimicrobial agent to prevent microbial growth in formulations
Storage: Store in a cool, dry place away from direct sunlight and heat; keep container tightly closed
Raw Material Sources: Synthesized from imidazolidine and formaldehyde, typically from petrochemical-derived sources
Manufacture: Produced through chemical synthesis, typically involving imidazolidine reaction with formaldehyde to form the urea derivative
Animal Testing: Some suppliers may follow cruelty-free practices; confirm with specific manufacturer
GMO: Not derived from genetically modified organisms
Vegan: Yes; synthetic, does not contain animal-derived ingredients
Proposition: Typically compliant with California Proposition 65; however, check specific formulations for potential residual formaldehyde content
Warning: Can release small amounts of formaldehyde, which may cause skin irritation or allergic reactions in sensitive individuals; potential concerns with formaldehyde-releasing preservatives in sensitive populations
THE STORY OF IMIDAZOLIDINYL UREA
Imidazolidinyl Urea: The Reliable Preservative for Long-Lasting Product Protection
Imidazolidinyl Urea is a widely used broad-spectrum cosmetic preservative that protects formulas from bacteria, mold, and yeast.
Stable, efficient, and compatible with most cosmetic bases, it is commonly used in creams, lotions, shampoos, liquid soaps, and skin-care products to ensure product safety and long shelf life.
A Urea-Based Preservative Engineered for Antimicrobial Stability
Imidazolidinyl Urea is produced by combining imidazolidine compounds with urea, forming an antimicrobial ingredient effective at low levels.
Key characteristics:
• Works across broad pH ranges
• Compatible with surfactants & emulsifiers
• Effective even at low temperatures
TRCkem supplies high-purity cosmetic-grade Imidazolidinyl Urea suited for personal-care applications.
Preserve. Protect. Maintain.
Imidazolidinyl Urea ensures long-lasting product stability:
✅ Provides broad-spectrum antimicrobial protection
✅ Extends shelf life of water-based products
✅ Prevents bacterial contamination after repeated use
✅ Highly compatible with emulsions & surfactant systems
Used in: moisturizers, creams, shampoos, cleansers, soaps, baby-care products, and body lotions.
Efficient, Easy to Use & Globally Accepted Preservative
• Typical use level: 0.2–0.6%
• Most effective in pH 3–9
• Add during cool-down phase (<50°C)
• Compatible with other preservatives (Parabens, Phenoxyethanol)
• Globally approved for rinse-off & leave-on products
• Store in cool, dry conditions away from moisture
• Safe for cosmetic use when used within regulatory limits
Formulator’s Queries, We Answered
1. What is Imidazolidinyl Urea?
Imidazolidinyl Urea is a preservative used in personal care and cosmetic formulations to prevent the growth of bacteria, yeast, and mold. It is a formaldehyde-releasing compound that helps extend shelf life and maintain product safety, especially in water-based formulations.
2. What is the INCI name and CAS number of Imidazolidinyl Urea?
CAS Number: 39236-46-9
INCI Name: Imidazolidinyl Urea
3. What are the main benefits of using Imidazolidinyl Urea in personal care products?
Provides broad-spectrum antimicrobial protection
Effective against bacteria, yeast, and molds
Increases the shelf life of water-containing products
Works synergistically with other preservatives
Stable in a wide pH range (typically 3 to 9)
4. What types of personal care products typically contain Imidazolidinyl Urea?
This preservative is commonly used in:
Moisturizers and lotions
Shampoos and conditioners
Liquid soaps and cleansers
Makeup products (foundation, powders)
Sunscreens and other topical products
5. Is Imidazolidinyl Urea safe for cosmetic use?
Yes, it is approved for cosmetic use in many countries, including the US (FDA) and EU, with maximum concentration limits. However, since it is a formaldehyde-releasing agent, its use is restricted in leave-on products in some regions, and it's important to comply with local regulations.
6. What is the recommended usage level of Imidazolidinyl Urea in formulations?
Typically used at 0.3% to 0.6% in cosmetic formulations. The maximum allowed concentration varies by region, and regulatory guidelines must be followed.
7. Is Imidazolidinyl Urea suitable for sensitive skin?
While generally well-tolerated, sensitive skin users or those with formaldehyde allergies may experience irritation. For sensitive skin products, alternative preservative systems are often considered.
8. Is Imidazolidinyl Urea considered natural or synthetic?
Imidazolidinyl Urea is a synthetic preservative. It is not considered natural or organic and is typically avoided in clean beauty or natural-certified formulations.