Terephthalylidene Dicamphor Sulfonic Acid

At a glance

CAS number

90457-82-2

INCI name

Terephthalylidene Dicamphor Sulfonic Acid

Function

uv_filter, photoprotection

Typical use level

0.5%–10%

Solubility

water

Stable pH

5.5–8

CAS number and synonyms are sourced from PubChem. Function, usage levels, pH and compatibility are AI-assisted formulation guidance — verify against your supplier's technical data sheet and applicable regulations before use.

Also known as

Ecamsule Mexoryl SX TDSA Terephthalylidene Dicamphor Sulfonate

Compatibility

Works well with:
Titanium Dioxide Zinc Oxide Octocrylene Butyl Methoxydibenzoylmethane Avobenzone Niacinamide

Ecamsule is notably effective when combined with avobenzone (Butyl Methoxydibenzoylmethane) and octocrylene, as the combination provides broad-spectrum UVA/UVB coverage with enhanced photostability. Being water-soluble, it pairs well with oil-soluble UV filters in emulsion systems to achieve broad-spectrum protection. It is generally considered photostable and does not significantly destabilize other common UV filters.

Formulation notes

Terephthalylidene Dicamphor Sulfonic Acid is a water-soluble UVA filter (absorbing primarily in the UVA-I range, ~345 nm) approved in the EU (up to 10%), Canada, and several other markets, but not currently approved as a standalone OTC sunscreen active in the United States by the FDA. Formulators use it to achieve broad-spectrum UVA protection in aqueous phases of sunscreen emulsions, often in combination with UVB filters. It is considered photostable and well-tolerated, with a strong safety profile supported by extensive clinical data.

Frequently asked questions

Related ingredients

• Diethylamino Hydroxybenzoyl Hexyl BenzoateUv Filter
• Bis-Ethylhexyloxyphenol Methoxyphenyl TriazineUv Filter
• Ethylhexyl MethoxycinnamateUv Filter
• Ethylhexyl SalicylateUv Filter
• Ethylhexyl TriazoneUv Filter
• Methylene Bis-Benzotriazolyl TetramethylbutylphenolUv Filter