Octisalate (Ethylhexyl Salicylate) - UVB Filter CAS 118-60-5 / Articles

Octisalate (Octisalate, Ethylhexyl Salicylate) CAS 118-60-5: Overview

1. Definition and General Description

Octisalate (chemically, Ethylhexyl Salicylate) is an organic sunscreen filter primarily designed to block and scatter UVB radiation. By forming a protective layer on the skin surface, the substance reduces the risk of sunburn and photodamage.

CAS: 118-60-5

Synonyms: Octyl Salicylate, Ethylhexyl Salicylate

2. Molecular Formula and Characteristics

Molecular formula: C₁₅H₂₂O₃

Chemical structure: Salicylic acid esterified with 2-ethylhexanol.

Appearance: Pale yellow liquid, sometimes almost colorless.

Odor: Weak "salicylate" or not pronounced.

Density: ~1.01–1.02 g/cm³ (at 20°C).

Boiling point: Approximately 169–170°C at reduced pressure; significantly higher at atmospheric pressure.

Flash point: 104–115°C (depending on method).

Solubility:

In water: Low (practically insoluble).
In organic solvents and oils: Readily soluble.

Decomposition: Upon overheating, decomposes with the release of acrolein-like products and carbon oxides.

Storage conditions: Store in tightly sealed containers at moderate temperature, protected from moisture and direct UV radiation.

Stability: Generally stable within the prescribed pH range of cosmetic products.

3. Applications

Sunscreen cosmetics: Lotions, sprays, creams; improves consumer properties due to pleasant tactility.

Water-resistant formulations: Contributes to the adhesion of oil and active components on the skin, increasing resistance to washing off.

Combination products: Often combined with other filters to broaden the protection spectrum (UVA + UVB).

4. Potential Impact and Safety

Skin: Generally well-tolerated; in rare cases, allergic reactions to salicylates may occur.

Toxicity: Minimal under normal use; however, ingestion is not recommended.

Ecology: Requires rational use to reduce impact on aquatic ecosystems.

5. Conclusion

Octisalate (CAS 118-60-5) is one of the key UVB filters in modern cosmetology. It provides ease of application and enhances water resistance. Due to its compatibility with a range of other filters, the substance is often included in complex formulations aimed at broad-spectrum skin protection against ultraviolet radiation.