How Ethylhexyl Methoxycinnamate Provides UVB Protection in Sunscreens

Introduction

Ethylhexyl Methoxycinnamate, also known as Octinoxate, is an organic compound widely used as a UVB filter in sunscreens and skincare products. It effectively absorbs UVB rays, preventing sunburn and minimizing the risk of DNA damage caused by ultraviolet exposure. Due to its ease of formulation and high absorption efficiency, it is one of the most common sunscreen agents globally.

Product Information

• Name: Ethylhexyl Methoxycinnamate (Octinoxate)

• Chemical Formula: C18H26O3

• CAS Number: 5466-77-3

• Appearance: Clear, oily liquid

• Solubility: Oil-soluble, suitable for emulsified cosmetic formulations

Key Features

• ☀️ Effective UVB absorption to prevent sunburn

• Commonly used in sunscreens, moisturizers, and makeup with SPF

• Lightweight, non-greasy texture for cosmetic compatibility

• Stabilizes formulations when blended with other UV filters

• High safety profile in regulated concentrations

Applications

Ethylhexyl Methoxycinnamate absorbs UVB radiation and converts it into less harmful heat energy, preventing UV penetration into the skin. This process reduces the risk of sunburn, oxidative stress, and photoaging associated with sun exposure.

Advantages

• Provides strong UVB protection in lightweight formulations

• Ideal for cosmetic products requiring SPF

• Blends well with other UV filters for broad-spectrum coverage

• Non-irritating and suitable for most skin types

Limitations

• Does not provide UVA protection (requires combination with UVA filters)

• Can be unstable under prolonged UV exposure unless stabilized

• Restricted in some regions due to environmental concerns about coral reefs

FAQs

Q: Is Ethylhexyl Methoxycinnamate safe for daily use?
A: Yes, it is safe when used at regulatory-approved concentrations (commonly up to 7.5%).

Q: Does it protect against UVA rays?
A: No, it is a UVB filter. For full UVA coverage, it should be combined with filters like Avobenzone or Zinc Oxide.

Q: Why is it sometimes restricted in marine environments?
A: Like other chemical UV filters, it has raised concerns about coral reef impact, leading some regions to limit its use.

Conclusion

Ethylhexyl Methoxycinnamate is an effective and widely used UVB filter, essential for preventing sunburn and supporting SPF formulations. When combined with complementary UVA filters, it provides strong sun protection suitable for both daily skincare and sunscreen products.