Diphenylamine extra pure

Diphenylamine extra pure is a high-purity grade of diphenylamine suitable for analytical and research applications. It is supplied as a crystalline organic solid with typical assay ≥99% and is used mainly as a reagent, redox indicator, and antioxidant in laboratory and industrial settings.​

Product overview

Chemical name: Diphenylamine

Synonyms: N-phenylbenzenamine, N-phenylaniline, anilinobenzene, DPA.​

CAS number: 122-39-4.​

Grade: Extra pure / AR / ACS-type, typical purity around 99%.​

Typical appearance: White to pale yellow crystalline powder or solid, sometimes tan on aging.​

Odor: Mild, amine-like.​

Chemical properties

Molecular formula: C₁₂H₁₁N (often written as

(

C

6

H

5

)

2

N

H

(C

6

H

5

)

2

NH).​

Molecular weight: 169.23 g/mol.​

Melting point: about 52–54 °C.​

Boiling point: about 302 °C at 760 mmHg.​

Solubility: Very low in water (~0.03–0.05 g/L), but soluble in alcohol and readily soluble in benzene, ether and many organic solvents.​

Uses and applications

Employed as an analytical reagent and redox indicator in various titrations.​

Used as an antioxidant and stabilizer in lubricants, rubber, and plastics.​

Also used in dye and pigment chemistry and, historically, as a post-harvest treatment to control superficial scald in stored apples (not for consumer use as such in a lab-grade product).​

Storage and safety (for catalogue text)

Storage: Store tightly closed at room temperature in a cool, dry, well-ventilated place; protect from light and ignition sources.​

Hazard notes (short form): Harmful if swallowed, causes serious eye damage, may cause organ damage on prolonged exposure, and very toxic to aquatic life; handle with appropriate PPE and avoid environmental release.​

Intended use: For laboratory and industrial use only; not for drug, food, or household use.​