Moderate Cosmetic Ingredient NOAEL Data

Hydroxyethyl-p-Phenylenediamine Sulfate

INCI: HYDROXYETHYL-P-PHENYLENEDIAMINE SULFATE

CAS Number
93841-25-9
Function
Oxidative hair dye primary intermediate
Safety Rating
MODERATE

Regulatory Status

๐Ÿ‡ช๐Ÿ‡บ EU Status prohibited
EU Max Conc. 2.0%
๐Ÿ‡บ๐Ÿ‡ธ US Status permitted
US Notes Permitted under coal tar hair dye exemption (21 CFR); caution labeling required

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

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
low
Sensitization
low

Calculate MoS for your specific formulation with the MoS Calculator.

Toxicological Studies

1 study endpoint found for Hydroxyethyl-p-Phenylenediamine Sulfate. NOAEL (No Observed Adverse Effect Level) values are used to calculate the Margin of Safety per SCCS methodology.

Endpoint Value Route Species Study Type Source
NOAEL 35 mg/kg bw/day oral rat oral REACH

Expert Verdict

Prohibited in EU as a coal tar hair dye intermediate; permitted in US with required caution labeling.

โš ๏ธ
Concern Level: Moderate

Regulatory Flags

eu_cosing_listed

Frequently Asked Questions

Is Hydroxyethyl-p-Phenylenediamine Sulfate safe in cosmetics?

Prohibited in EU as a coal tar hair dye intermediate; permitted in US with required caution labeling. The EU classifies Hydroxyethyl-p-Phenylenediamine Sulfate as "prohibited". Safety rating: MODERATE. 1 toxicological study endpoint(s) are available in our database.

Is Hydroxyethyl-p-Phenylenediamine Sulfate allowed in the EU?

Hydroxyethyl-p-Phenylenediamine Sulfate EU regulatory status: prohibited. Maximum allowed concentration: 2.0%. This is based on EU Regulation 1223/2009 and its amendments.

What does Hydroxyethyl-p-Phenylenediamine Sulfate do in cosmetics?

Hydroxyethyl-p-Phenylenediamine Sulfate functions as: Oxidative hair dye primary intermediate. It is classified as a cosmetic ingredient in our database. CAS number: 93841-25-9.

What is the Margin of Safety for Hydroxyethyl-p-Phenylenediamine Sulfate?

adequate 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.

What is the NOAEL for Hydroxyethyl-p-Phenylenediamine Sulfate?

The NOAEL (No Observed Adverse Effect Level) for Hydroxyethyl-p-Phenylenediamine Sulfate is 35 mg/kg bw/day based on a oral study via oral route in rat. Source: REACH.

๐Ÿ“ฑ

Is Hydroxyethyl-p-Phenylenediamine Sulfate in Your Products?

Scan any product label with Piro โ€” our free ingredient scanner. Point your camera at the ingredients list and get instant safety scores for every ingredient.

Try Piro Free โ†’

Analyze Your Full Ingredient List

Paste any INCI list into the Decoder for instant safety analysis, or calculate the Margin of Safety for Hydroxyethyl-p-Phenylenediamine Sulfate in your formulation.