Question 1

What does Homosalate 9.8% do in a cosmetic formula?

Accepted Answer

This ingredient is an oil-soluble UVB filter used in sunscreens and SPF cosmetics to boost protection mainly in the short-wavelength UV range. At 9.8%, it is present at a functional sunscreen-filter level rather than as a minor additive.

Question 2

Is Homosalate 9.8% clean?

Accepted Answer

From a clean-beauty perspective, this ingredient has significant friction because it is a synthetic organic UV filter with endocrine-activity questions and evolving regulatory limits in some markets. Many stricter clean standards and retailers flag or restrict it, especially at higher use levels.

Question 3

Is Homosalate 9.8% sustainable?

Accepted Answer

This material is synthetically produced, generally from petrochemical-derived feedstocks, rather than from a renewable botanical or mineral source. It is not a strong fit for readily biodegradable, low-persistence ingredient design, and UV filters in rinse-off or beach-use contexts can raise aquatic exposure questions.

Question 4

Is Homosalate 9.8% COSMOS-approved?

Accepted Answer

This ingredient is not aligned with COSMOS-natural or COSMOS-organic sunscreen criteria, which generally do not permit this type of synthetic organic UV filter. Its fossil-derived sourcing, persistence concerns, and regulatory scrutiny make it a weak fit with Green Chemistry priorities.

Question 5

How does Homosalate 9.8% work chemically?

Accepted Answer

The molecule is an esterified aromatic compound that absorbs primarily in the UVB region, with peak absorbance around the high-290s to low-300s nm range, and it is typically paired with other filters for broader UVA and UVB coverage. Use around 5% to 10% is common in SPF systems, while 9.8% sits near historical 10% regulatory caps in some regions and below the 15% maximum allowed in the United States.