Para Phenylene Diamine

Description

Para Phenylene Diamine · CAS 25168-37-0 · C6H8N2. UNII U770QIT64J. Boiling Point: 513 °F at 760 mmHg (NTP, 1992); Boiling Point: 267 °C; Boiling Point: 513 °F.

Identification

CAS Registry Number	25168-37-0
PubChem CID	7814
Molecular formula	C6H8N2
IUPAC name	benzene-1,4-diamine
UNII (FDA)	U770QIT64J

Computed Descriptors

Molecular Weight	108.14
XLogP3	-0.3
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	108.068748264
Monoisotopic Mass	108.068748264
Topological Polar Surface Area	52
Heavy Atom Count	8
Formal Charge	0

Physical & Chemical Properties

Boiling Point	513 °F at 760 mmHg (NTP, 1992)
Boiling Point	267 °C
Boiling Point	513 °F
Boiling Point	267 °C @760 [mm Hg]
Melting Point	284 °F (NTP, 1992)
Melting Point	145-147 °C
Melting Point	139-147 °C
Melting Point	295 °F
Melting Point	141.1 °C
Flash Point	311 °F (NTP, 1992)

Physical description & handling notes

• P-phenylenediamine appears as a white to purple crystalline solid (melting point 234 F) that turns purple to black in air. Flash point 309 F. Toxic by skin absorption, inhalation or ingestion. Used for production of aramid fiber, antioxidants, as a laboratory reagent, in photographic developing, and as a dye for hair and furs.
• Large Crystals; Liquid
• White to slightly red, crystalline solid; [NIOSH]
• WHITE-TO-SLIGHTLY-RED CRYSTALS. TURNS DARK ON EXPOSURE TO AIR.
• White to slightly red, crystalline solid.
• WHITE TO SLIGHTLY RED CRYSTALS

Regulatory Status

Regulatory & Food Contact	FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS CIR / INCI: Cosmetics ingredient -> Colorant; Other (Specify) CIR / INCI: Cosmetic ingredients (p-Phenylenediamine) -> CIR (Cosmetic Ingredient Review) CIR / INCI: Hair dyeing

GHS Hazard Classification

Reported hazard statements	H301, H311, H317, H319, H331, H400, H410, H370 (38.9%)

Documented Uses

• CIR ingredient: p-Phenylenediamine
• p-Phenylenediamine is primarily used as a dye intermediate and as a dye (e.g., hair dyes and dyes used for dyeing furs), as well as a photographic developing agent and a chemical intermediate. p-Phenylenediamine is also used as a vulcanization accelerator and as an antioxidant in rubber compounds.
• Used to dye hair and fur; also used to develop photographs and to synthesize other organic compounds; [ACGIH] Occupational asthma reported in fur dyers; [Malo] Allergic contact dermatitis in hairdressers, mechanics, printers, and textile workers; [Marks] Used to dye leather; [PMID 21938525]
• Leather Tanning and Processing [Category: Industry]
• Photographic Processing [Category: Other]
• Fur Dressing and Dyeing [Category: Industry]

Synonyms

p-Phenylenediamine; 106-50-3; 1,4-BENZENEDIAMINE; 1,4-Diaminobenzene; 1,4-Phenylenediamine; 4-Aminoaniline; para-phenylenediamine; p-Aminoaniline; p-Diaminobenzene; Orsin; Paraphenylenediamine; Ursol D; 4-Phenylenediamine; p-Benzenediamine; Fouramine D; Futramine D

Frequently Asked Questions

What are the CAS number and molecular formula of Para Phenylene Diamine?

CAS 25168-37-0; molecular formula C6H8N2; molecular weight — g/mol.

What other names is Para Phenylene Diamine known by?

p-Phenylenediamine, 106-50-3, 1,4-BENZENEDIAMINE, 1,4-Diaminobenzene, 1,4-Phenylenediamine, 4-Aminoaniline.

What is the regulatory status of Para Phenylene Diamine?

Documented regulatory listings: FDA Inventory of Food Contact Substances Listed in 21 CFR: FCS; CIR / INCI: Cosmetics ingredient -> Colorant; Other (Specify); CIR / INCI: Cosmetic ingredients (p-Phenylenediamine) -> CIR (Cosmetic Ingredient Review).

Is Para Phenylene Diamine classified as hazardous?

Hazard statements reported: H301, H311, H317, H319, H331.

What are the key physical properties of Para Phenylene Diamine?

Boiling Point: 513 °F at 760 mmHg (NTP, 1992); Boiling Point: 267 °C; Boiling Point: 513 °F; Boiling Point: 267 °C @760 [mm Hg].

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.