Thioxanthone

INCI: THIOXANTHONE (NOT AN ASSIGNED COSMETIC INCI โ€” USED AS A PHOTOINITIATOR IN UV-CURING SYSTEMS)

CAS Number
492-22-8
Function
Photoinitiator / UV absorber (industrial, not cosmetic)
Safety Rating
POOR

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Not listed in FDA's Voluntary Cosmetic Registration Program (VCRP) as a cosmetic ingredient; no specific FDA cosmetic monograph

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
not established
Dermal Absorption
moderate
Sensitization
moderate

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Photoinitiator contaminant in packaging; not a cosmetic ingredient. Potential phototoxicity. Known to migrate from UV-cured inks into products

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Concern Level: High

Frequently Asked Questions

Is Thioxanthone safe in cosmetics?

Photoinitiator contaminant in packaging; not a cosmetic ingredient. Potential phototoxicity. Known to migrate from UV-cured inks into products The EU classifies Thioxanthone as "permitted". Safety rating: POOR.

Is Thioxanthone allowed in the EU?

Thioxanthone EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.

What does Thioxanthone do in cosmetics?

Thioxanthone functions as: Photoinitiator / UV absorber (industrial, not cosmetic). It is classified as a cosmetic ingredient in our database. CAS number: 492-22-8.

What is the Margin of Safety for Thioxanthone?

not established The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

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