• Effective against gram-positive and gram-negative bacteria
• Water-soluble and easy to incorporate into emulsions
• Commonly used in shampoos, conditioners, and lotions
• Works well in combination with other preservatives
• Suitable for leave-on and rinse-off formulations

DMDM Hydantoin – Broad-Spectrum Liquid Preservative for Cosmetics

DMDM Hydantoin is a formaldehyde-releasing preservative that provides excellent protection against microbial growth in cosmetic formulations. It is widely used in both rinse-off and leave-on products due to its compatibility with a broad pH range and ease of use in emulsions. With proven efficacy against bacteria and some fungi, it helps extend the shelf life of water-based formulations. This liquid preservative is ideal for shampoos, creams, lotions, and other personal care products requiring long-lasting antimicrobial defense.

INCI Name: DMDM Hydantoin

CAS Number: 6440-58-0

Solubility: Water-soluble

Add Phase: Cool-down phase (below 40°C)

pH Stability: 3.0 – 9.0

Processing Temperature: Below 40°C

Appearance: Clear to slightly yellow liquid

Odor: Mild, characteristic odor

Molecular Formula: C7H12N2O4

Molecular Weight: 188.18 g/mol

Flash Point: > 100°C

Density: ~1.1 g/cm³

Chemical Type: Preservative (Formaldehyde releaser)

Functional Groups: Hydantoin derivatives

Primary Cosmetic Uses: Shampoos, conditioners, creams, lotions, facial cleansers

• Usage Rate: 0.2% – 0.6%
• Compatible With: Most emulsifiers and surfactants
• Storage: Store in a cool, dry place away from direct light

For extra protection in broad-spectrum systems, pair DMDM Hydantoin with Potassium Sorbate or Phenoxyethanol for fungi and yeast coverage

✔️ Normal

✔️ Oily

❌ Not recommended for very sensitive skin

All-in-One Cream Cleanser

– 80% Water

– 5% Emulsifier

– 5% Oil Phase

– 0.5% DMDM Hydantoin

– 0.5% Fragrance

– pH adjuster and humectant as required

Budget-Friendly Shampoo

– 65% SLES Base

– 15% Cocamidopropyl Betaine

– 0.4% DMDM Hydantoin

– 0.6% Fragrance

– Color and conditioning agents optional

Serums
☆☆☆☆☆ – Not Suitable
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Creams & Lotions
⭐⭐⭐⭐☆ – Good
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Toners
⭐⭐⭐☆☆ – Reasonable
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Face Masks
⭐⭐⭐⭐☆ – Good
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Cleansers
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜


Hair Masks
⭐⭐⭐⭐☆ – Good
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Deodorants
☆☆☆☆☆ – Not Suitable
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Eye Creams
☆☆☆☆☆ – Not Suitable
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Shampoos
⭐⭐⭐⭐⭐ – Excellent
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Soaps
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜


Conditioners
⭐⭐⭐⭐☆ – Good
🟩🟩🟩🟩⬜


Lip Balms
☆☆☆☆☆ – Not Applicable
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Body Butters
⭐⭐⭐☆☆ – Reasonable
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Ointments
⭐⭐⭐☆☆ – Reasonable
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