Isopropyl Thioxanthone

INCI: ISOPROPYL THIOXANTHONE

CAS Number
5495-84-1 (2-isopropylthioxanthone) / 83846-86-0 (4-isopropylthioxanthone) [^1_6][^1_7]
Function
Photoinitiator (UV-curing of inks and coatings)
Safety Rating
POOR

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status permitted
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Not listed as a cosmetic ingredient in 21 CFR. FDA would evaluate under adulteration provisions if found as a contaminant.

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

Safety Data

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

Calculate MoS for your specific formulation with the MoS Calculator.

Expert Verdict

Industrial photoinitiator with poor safety profile (H302, H304, H400 classifications). Its presence in cosmetics indicates packaging migration or contamination, not intentional formulation. Must be treated as an impurity.

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Concern Level: High

Frequently Asked Questions

Is Isopropyl Thioxanthone safe in cosmetics?

Industrial photoinitiator with poor safety profile (H302, H304, H400 classifications). Its presence in cosmetics indicates packaging migration or contamination, not intentional formulation. Must be treated as an impurity. The EU classifies Isopropyl Thioxanthone as "permitted". Safety rating: POOR.

Is Isopropyl Thioxanthone allowed in the EU?

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

What does Isopropyl Thioxanthone do in cosmetics?

Isopropyl Thioxanthone functions as: Photoinitiator (UV-curing of inks and coatings). It is classified as a cosmetic ingredient in our database. CAS number: 5495-84-1 (2-isopropylthioxanthone) / 83846-86-0 (4-isopropylthioxanthone) [^1_6][^1_7].

What is the Margin of Safety for Isopropyl 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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