3,3'-Dichlorobenzidine

Also known as: 3,3'-Dichloro-(1,1'-biphenyl)-4,4'-diamine, 3,3'-Dichloro-4,4'-biphenyldiamine, 3,3'-Dichloro-4,4'-diaminobiphenyl, DCB, o,o'-Dichlorobenzidine

3,3'-Dichlorobenzidine (CAS 91-94-1) is a compound in the Organic Bases category listed in the Jingsj chemical database. It has the molecular formula C12H10Cl2N2 and a molecular weight of 253.127 g/mol. Key properties include a melting point of 133ºC, a boiling point of 385.0±37.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 186.6±26.5 °C. It is classified under GHS with signal word Danger and hazard statements H225 — Highly flammable liquid and vapour, H301 — Toxic if swallowed and H311 — Toxic in contact with skin. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 91-94-1
Jingsj CID: J-38882-9
Molecular Formula: C₁₂H₁₀Cl₂N₂
Molecular Weight: 253.127 g/mol
Category: Organic Bases
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	133ºC
Boiling Point	385.0±37.0 °C at 760 mmHg
Density	1.4±0.1 g/cm3
Flash Point	186.6±26.5 °C
Exact Mass	252.022110
PSA	52.04000
LogP	3.45
Vapor Pressure	0.0±0.9 mmHg at 25°C
Refractive Index	1.679

GHS Safety & Compliance

Flammable / Acute Toxicity / Health Hazard / Environmental HazardSignal word: Danger

H225 — Highly flammable liquid and vapour
H301 — Toxic if swallowed
H311 — Toxic in contact with skin
H331 — Toxic if inhaled
H350 — May cause cancer
H370 — Causes damage to organs
H411 — Toxic to aquatic life with long lasting effects

Customs & Trade Information

HS Code	2921590032
Summary	HS:2921590032 3,3'-dichloro-[1,1'-biphenyl]-4,4'-diamine VAT:17.0% Tax rebate rate:9.0% Supervision conditions:x MFN tariff:6.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3,3'-Dichlorobenzidine?

The CAS number of 3,3'-Dichlorobenzidine is 91-94-1.

What are the molecular formula and molecular weight of 3,3'-Dichlorobenzidine?

3,3'-Dichlorobenzidine has molecular formula C12H10Cl2N2 and molecular weight 253.127 g/mol.

Is 3,3'-Dichlorobenzidine hazardous?

3,3'-Dichlorobenzidine has GHS signal word Danger and hazard statements H225 — Highly flammable liquid and vapour; H301 — Toxic if swallowed; H311 — Toxic in contact with skin.

What are the upstream and downstream products of 3,3'-Dichlorobenzidine?

For 3,3'-Dichlorobenzidine, Upstream Products: 2',4'-Dimethylacetoacetanilide, 4'-Chloro-2',5'-dimethoxyacetoacetanilide, N,N'-Diacetylbenzidine; Downstream Products: 3,3',4,4'-Tetrachlorobiphenyl, 2,3',4,4',5-Pentachlorobiphenyl.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "3,3'-Dichlorobenzidine (CAS 91-94-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-38882-9 (accessed 2026-11-06).

Data for reference only; verify product details with suppliers before purchase.