Home | Daivat LifeSciences

OPDA (Ortho-Phenylenediamine)

CAS Number:95‑54‑5

Synonyms:o‑Phenylenediamine; OPDA; 1,2‑Diaminobenzene

Chemical Formula:C₆H₈N₂

Molecular Weight:108.14 g/mol

Product Introduction

A yellow to tan crystalline solid (≥98% purity). A primary aromatic diamine, OPDA is a key intermediate in the synthesis of dyes, corrosion inhibitors, agrochemicals, phthalocyanine pigments, pharmaceuticals, epoxy hardeners, and removing sulfur species in mining.

Get Quote

Physical & Chemical Properties

Property	Value
Appearance	Pale yellow crystalline solid
Odor	Slight aromatic amine odor
Melting Point	~103–104 °C
Solubility	Practically insoluble in cold water; soluble in hot water, benzene, organics
Vapor Pressure @ 20 °C	~0.013 mbar
Density	~1.06 g/cm³ (typical for crystalline amines)

Applications

Dye intermediates (azo dyes, phthalocyanines)
Corrosion inhibitor precursors
Agrochemical & pharmaceutical synthetic building block
Sulfur removal in mining, epoxy hardener synthesis

Safety Notes:

Harmful if swallowed/inhaled (LD₅₀ ~1070 mg/kg in rats). Skin/eye irritant. GHS H302/H312/H319. Use gloves, respirator, fume hood; store sealed, cool, dry.