Octocrylene - Organic UV Filter for Sunscreen CAS 6197-30-4

Octocrylene (CAS 6197-30-4): Overview

1. Definition and General Description

Octocrylene is a UV filter whose primary function is to absorb ultraviolet radiation, mainly in the UVB range (280–320 nm) and partially UVA (320–400 nm). It is included in a wide range of sunscreen products.

CAS: 6197-30-4

Synonyms in different languages:

• English: Octocrylene

• German: Octocrylen

• Chemical: 2-Ethylhexyl-2-cyano-3,3-diphenylacrylate

2. Molecular Formula and Properties

Molecular formula: C₂₄H₂₇NO₂

Structural feature: Acrylic acid derivative with phenyl rings and ethylhexyl group.

Appearance: Colorless or pale yellow oily liquid.

Odor: Weak, characteristic of organic esters.

Density: ~1.05 g/cm³ at 20°C.

Boiling point: ~215°C (at reduced pressure); significantly higher at atmospheric pressure.

Melting point: ~ –10°C.

Flash point: Approximately 113–116°C.

Solubility: Very low in water (<0.1 g/L), readily soluble in oils and many organic solvents.

Decomposition: Under extreme heating, may release carbon and nitrogen oxides.

Storage conditions: Store in tightly closed containers at room temperature, away from direct sunlight; risk of thickening in cold conditions.

Stability: Relatively high; the substance is photostable and commonly used to stabilize other less stable filters (e.g., avobenzone).

3. Use and Applications

Sunscreen cosmetics: Widely used in lotions, creams, and sprays for face and body to provide UV protection and prevent photoaging.

Tanning formulations: Due to its oily texture and resistance to washing off, enhances the water resistance of products used at the beach or in pools.

Stabilizer of other filters: Prevents the degradation of components such as avobenzone under UV exposure.

4. Potential Impact and Safety

Skin reactions: Generally well-tolerated, but in rare cases may cause mild irritation or allergic reactions in individuals with hypersensitivity.

Environmental aspect: Research on the impact on aquatic fauna is ongoing; therefore, careful use and disposal measures are recommended.

Regulation: Many countries limit the maximum permitted concentration in formulations (up to 10–10.5%).

5. Conclusion

Octocrylene (CAS 6197-30-4) is a key UV filter due to its stability and compatibility with oil phases. Its ability to enhance the effectiveness and durability of sunscreens under various conditions ensures wide demand in the cosmetic industry. Compliance with safety standards and environmental regulations allows successful use of this ingredient in UV protection products.