4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane

Also known as: 1,1'-Methylenebis(4-isocyanato-3-methylbenzene), Bis(4-isocyanato-3-methylphenyl)methane, 3,3'-Dimethyl-4,4'-diisocyanatodiphenylmethane, 5,5'-Methylenebis(2-isocyanatotoluene), 3,3'-Dimethyldiphenylmethane-4,4'-diisocyanate, Nacconate 310, Isocyanic acid, ester with di-o-toluenemethane

4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS 139-25-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C17H14N2O2 and a molecular weight of 278.305 g/mol. Key properties include a boiling point of 410.4±45.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 169.5±34.1 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 139-25-3
Jingsj CID: J-16065-6
Molecular Formula: C₁₇H₁₄N₂O₂
Molecular Weight: 278.305 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	410.4±45.0 °C at 760 mmHg
Density	1.1±0.1 g/cm3
Flash Point	169.5±34.1 °C
Exact Mass	278.105530
PSA	58.86000
LogP	5.86
Vapor Pressure	0.0±1.0 mmHg at 25°C
Refractive Index	1.576

Customs & Trade Information

HS Code	2929109000
Summary	2929109000. other isocyanates. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane?

The CAS number of 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane is 139-25-3.

What are the molecular formula and molecular weight of 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane?

4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane has molecular formula C17H14N2O2 and molecular weight 278.305 g/mol.

What are the upstream and downstream products of 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane?

For 4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane, Upstream Products: 4,4'-Methylenebis(2-methylaniline).

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. "4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS 139-25-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-16065-6 (accessed 2026-11-09).

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