Description

4,4′-Methylenedianiline (MDA) is a high-purity aromatic amine with the molecular formula C₁₃H₁₄N₂ and CAS number 101-77-9. This compound, also known by its IUPAC name 4-[(4-aminophenyl)methyl]aniline, is a key intermediate in the synthesis of polymers, epoxy resins, and polyurethane elastomers. Its rigid diphenylmethane structure provides excellent thermal and mechanical stability, making it ideal for high-performance applications. Our MDA is rigorously tested to ensure >99% purity (HPLC/GC), with low levels of moisture (<0.1%) and heavy metals (<10 ppm). Supplied as white to pale yellow crystalline flakes with a characteristic amine odor. Packaged under nitrogen atmosphere to prevent oxidation. Suitable for use in:

• Isocyanate production (MDI precursors)
• Aerospace composite matrices
• Electrical encapsulation materials
• Corrosion-resistant coatings

Available in research (100g, 500g) and bulk (25kg drum) quantities. SDS and technical data sheets provided with all orders. Store in cool, dry conditions away from oxidizers.

Properties

• CAS Number: 101-77-9
• Complexity: 157
• IUPAC Name: 4-[(4-aminophenyl)methyl]aniline
• InChI: InChI=1S/C13H14N2/c14-12-5-1-10(2-6-12)9-11-3-7-13(15)8-4-11/h1-8H,9,14-15H2
• InChI Key: YBRVSVVVWCFQMG-UHFFFAOYSA-N
• LogP: log Kow = 1.59
• Exact Mass: 198.115698455
• Molecular Formula: C13H14N2
• Molecular Weight: 198.26
• SMILES: C1=CC(=CC=C1CC2=CC=C(C=C2)N)N
• Topological: 52
• Monoisotopic Mass: 198.115698455
• Physical Description: 4,4′-diaminodiphenylmethane appears as a tan flake or lump solid with a faint fishlike odor. May be toxic by inhalation or ingestion, and may be irritating to skin. Insoluble in water.
• Color/Form: Crystals from water or benzene
• Odor: Faint, amine-like odor
• Boiling Point: 748 to 750 °F at 768 mmHg
• Melting Point: 197 to 198 °F
• Flash Point: 430 °F
• Solubility: less than 1 mg/mL at 66 °F
• Density: 1.15 at 77 °F – Denser than water; will sink
• Vapor Density: 6.8 – Heavier than air; will sink
• Vapor Pressure: 1e-07 mmHg at 77 °F
• Stability/Shelf Life: OXIDIZES IN AIR; PALE YELLOW CRYSTALS TURN DARK COLOR WHEN EXPOSED TO AIR.
• Viscosity: 8.3 cP at 100 °C
• Heat of Vaporization: 95.4 kJ/mol
• Ionization Potential: 10.70 eV
• Synonyms: 4,4′-Methylenedianiline, 101-77-9, 4,4′-DIAMINODIPHENYLMETHANE, Dadpm, Methylenedianiline, Tonox, Dianilinomethane, 4-[(4-aminophenyl)methyl]aniline, Bis(4-aminophenyl)methane, p,p’-Methylenedianiline, Dianilinemethane, Benzenamine, 4,4′-methylenebis-, 4,4-Methylenedianiline, p,p’-Diaminodiphenylmethane, Epicure DDM, Epikure DDM, Bis(p-aminophenyl)methane, Curithane, 4-(4-Aminobenzyl)aniline, Jeffamine AP-20, Sumicure M, Diaminodiphenylmethane, 4,4′-Diphenylmethanediamine, Ancamine TL, Di-(4-aminophenyl)methane, 4,4′-Methylenebis(benzeneamine), Methylenebis(aniline), Bis-p-aminofenylmethan, 4,4′-Methylene dianiline, Araldite hardener 972, Di(4-aminophenyl)methane, p,p’-Diaminodifenylmethan, 4,4′-Methylenebisaniline, 4,4′-Diaminodiphenylmethan, 4,4′-Methylenebisbenzenamine, Aniline, 4,4′-methylenedi-, 4,4′-Dimethylenediamine, Methylenedianiline (VAN), Avaldite HT 972, 4,4′-Methylenebis(aniline), HT 972, NSC 4709, Methylenebis[aniline], Bis(aminophenyl)methane, CCRIS 1010, Bis-p-aminofenylmethan [Czech], bis-p-aminophenylmethane, GG5LL7OBZC, CHEBI:32506, HSDB 2541, alpha-(p-aminophenyl)-p-toluidine, di-(p-aminophenyl)methane, p,p’-Diaminodifenylmethan [Czech], 4,4′-methylene-dianiline, EINECS 202-974-4, 4,4′-Methylenedibenzenamine, 4,4′-Diaminodiphenylmethan [German], p-Toluidine, alpha-(p-aminophenyl)-, UN2651, 4,4′-Methylene(bisaniline), 4,4′-Methylenebis[aniline], BRN 0474706, AI3-02615, 4,4-DIAMINODIPHENYLMETHANE, NSC-4709, p, p’-Methylenedianiline, METHYLENEDIANILINE-, 1219795-26-2, 4,4′-Methylenedi-Aniline, 4, 4′-Diphenylmethanediamine, 4-(4-Aminobenzyl)phenylamine, 4, 4′-Methylenebis(aniline), 4,4′-Methylenebis-Benzenamine, NSC4709, EC 202-974-4, 4,4-DIPHENYLMETHANE DIAMINE, 4,4′-DIPHENYLMETHANE DIAMINE, 4,4′-METHYLENEDIANILINE [HSDB], 4,4′-METHYLENEDIANILINE [IARC], P,P’-DIAMINODIPHENYLMETHANE [MI], 4-((4-aminophenyl)methyl)aniline, BIS-P-AMINOFENYLMETHAN (CZECH), 4,4′-METHYLENEDIANILINE (IARC), P,P’-DIAMINODIFENYLMETHAN (CZECH), 4,4′-DIAMINODIPHENYLMETHAN (GERMAN), para’-Diaminodiphenyl-methane, Bispaminofenylmethan, Jeffamine AP20, 4,4′-MDA, p,p’Methylenedianiline, 4(4Aminobenzyl)aniline, 4,4’Dimethylenediamine, Di(4aminophenyl)methane, Bis(paminophenyl)methane, p,p’Diaminodifenylmethan, 4,4’Methylenebisaniline, Bis(4aminophenyl)methane, p,p’diaminodiphenylmethane, 4,4’diaminodiphenylmethan, 4,4’diaminodiphenylmethane, 4,4’Diphenylmethanediamine, ACMEX H 84BM, Aniline, 4,4’methylenedi, ARALDITE HT 972, ARALDITE R 972, 4,4′-DIAMINODITAN, ANCAMINE 1692, 4,4′-DIAMINO DITAN, Benzenamine, 4,4’methylenebis, 4,4’methylenebis(benzeneamine), pToluidine, alpha(paminophenyl), XU-HY 205, 4-(P-AMINOBENZYL)ANILINE, DTXSID50872895, 4,4-Methylenedianiline (ACGIH), ARALDITE HARDENER HT 972, 4,4′-METHYLENEBIS(BENZENAMINE), 4,4′-METHYLENEDIANILINE-2,2′,6,6′,N,N,N’,N’-D8, 98 ATOM % D, 98% CP, 202-974-4, 663-410-4, inchi=1/c13h14n2/c14-12-5-1-10(2-6-12)9-11-3-7-13(15)8-4-11/h1-8h,9,14-15h, NCI-C54604, 4,4′-Diaminobiphenyl methane, DTXSID6022422, 4,4′-Diaminodiphenylmethane (MDA), 4,4′-methanediyldianiline, 4,4?-Diaminodiphenylmethane, 4,4′-Diaminodiphenyl methane, 4,4′-Methylenedianiline–d8, MFCD00007914, p-Toluidine, .alpha.-(p-aminophenyl)-, DTXCID402422, BIS-(4-AMINOPHENYL)METHANE, 4-[(4-aminophenyl)methyl]phenylamine, CAS-101-77-9, UNII-GG5LL7OBZC, A1IHK, Aniline,4′-methylenedi-, Epitope ID:116050, Di(para-aminophenyl)methane, WLN: ZR D1R DZ, methylenebis(4-aminobenzene), Oprea1_406523, SCHEMBL28001, Benzenamine,4′-methylenebis-, YSWG197, MLS002303003, BIDD:ER0255, CHEMBL85728, Dianiline, 4,4′-methylene-, Bis-p-aminofenylmethan(CZECH), SCHEMBL2196895, SCHEMBL5253436, SCHEMBL6424853, 4,4 -METHYLENEDIANILINE, Benzenamine,4-4′-methylenebis-, 4-(4-Aminobenzyl)phenylamine #, MSK1209, HMS3091M08, AAA10177, p, p’-Diaminodifenylmethan(CZECH), Tox21_201723, Tox21_300141, BBL022928, SBB058722, STK988515, 4, 4′-Diaminodiphenylmethan(GERMAN), AKOS000118778, Aniline, 4,4′-methylenedi- (8CI), 1ST1209, CCG-103567, SDCCGMLS-0066191.P001, UN 2651, NCGC00091159-01, NCGC00091159-02, NCGC00091159-03, NCGC00091159-04, NCGC00254163-01, NCGC00259272-01, AC-10921, MSK1209-1000, PD074403, SMR000019102, VS-07280, DB-058699, M0220, NS00003356, ST50406593, EN300-19463, 1ST1209-1000, 4,4′-Diaminodiphenylmethane, >=97.0% (GC), 4,4′-Diaminodiphenylmethane, analytical standard, 4-(4-Aminobenzyl)phenylamine (ACD/Name 4.0), A800456, Q229848, SR-01000394053, 4,4′-Diaminodiphenyl methane [UN2651] [Poison], SR-01000394053-1, 4,4 inverted exclamation mark -Diaminodiphenylmethane, F0921-0063, Z104473930, Bis-(4-aminophenyl)methane 100 microg/mL in Acetonitrile, 4,4′-Diaminodiphenylmethane Solution in Methanol, 1000mug/mL, 4,4?-Diaminodiphenylmethane Solution in Methanol, 1000?g/mL, 4,4′-Diaminodiphenylmethane, certified reference material, TraceCERT(R)

Application

4,4′-Methylenedianiline serves as a critical building block in polyurethane chemistry, where it functions as a chain extender in elastomer production. The compound’s primary application is as a precursor for methylene diphenyl diisocyanate (MDI), which accounts for over 80% of global demand. In materials science, MDA-derived epoxy resins demonstrate exceptional thermal resistance (>200°C) and mechanical strength, making them valuable for aerospace composites. The chemical’s bifunctional reactivity also enables crosslinking in advanced adhesive formulations.

Safety and Hazards

GHS Hazard Statements

• H400: Very toxic to aquatic life [Warning Hazardous to the aquatic environment, acute hazard]
• H410: Very toxic to aquatic life with long lasting effects [Warning Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P273, P391, and P501

Hazard Classes and Categories

• Acute Tox. 3 (14.5%)
• Skin Sens. 1 (100%)
• Muta. 2 (100%)
• Carc. 1B (100%)
• STOT SE 1 (100%)
• STOT RE 2 (99.8%)
• Aquatic Acute 1 (28.5%)
• Aquatic Chronic 2 (97.1%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.