Functions and Features of Octanediol (1,2-Octanediol)

Octanediol (typically referring to 1,2-Octanediol) is a multifunctional diol widely used in cosmetics. Compared with 1,2-Hexanediol, it has a longer carbon chain, giving it stronger antimicrobial activity and a noticeable effect on improving skin feel.

1. Powerful Preservative Booster

1,2-Octanediol has stronger antimicrobial properties than Hexanediol and can significantly:

• Enhance the formula’s resistance to bacteria and fungi
• Reduce the required amount of traditional preservatives
• Support “preservative-free” or “low-preservative” formulations

It is commonly used in products that avoid phenoxyethanol or parabens.

2. Solvent / Solubilizing Agent

• Helps dissolve certain water-soluble and oil-soluble ingredients
• Improves dispersion and stability of active components
• Enhances clarity in water-phase formulations

Often found in serums, mists, sheet-mask essences, and lotions.

3. Sensory Enhancer

Due to its longer carbon chain, Octanediol provides:

• Smooth, non-sticky skin feel
• Improved slip and spreadability
• A more noticeable silky texture compared with Hexanediol

Ideal for premium, lightweight skincare formulas.

4. Mild Moisturizing Effect

• Provides some moisture retention
• However, its moisturizing power is weaker than Hexanediol
• Plays a role more focused on antimicrobial + sensory improvement

5. Mildness and Good Safety Profile

• Generally low-irritation and mild
• Widely used in sensitive-skin and baby-care products
• Considered safe under EU, FDA, and Asian regulations

Typical Applications

• Serums and toners
• Sheet mask essences
• Formulas with reduced preservative systems
• Cleansing waters and sprays
• Sunscreens
• Baby skincare products

Typical usage level: 0.3–1.0% (up to 3% in some cases)

(When used as a preservative booster: usually 0.5–1%)

Summary

1,2-Octanediol offers:

✔ Stronger antimicrobial action → excellent preservative booster

✔ Smooth, non-sticky skin feel

✔ Solubilization and formula stabilization

✔ Mildness and high safety

It is often considered a “more antimicrobial-focused upgrade” of Hexanediol.