1,3-Bis(1-isocyanato-1-methylethyl)benzene

Also known as: TMXDI, m-TMXDI, α,α,α',α'-Tetramethyl-1,3-xylylene diisocyanate, Tetramethyl-m-xylylene diisocyanate, 1,3-Bis(2-isocyanato-2-propyl)benzene, 1,3-Bis(2-isocyanatopropan-2-yl)benzene, 1,3-Bis(1-isocyanato-1-methylethyl)benzene, m-Tetramethylxylene diisocyanate

1,3-Bis(1-isocyanato-1-methylethyl)benzene (CAS 2778-42-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C14H16N2O2 and a molecular weight of 244.289 g/mol. Key properties include a melting point of -10 °C, a boiling point of 309.9±35.0 °C at 760 mmHg, a density of 1.0±0.1 g/cm3 and a flash point of 126.4±31.3 °C. It is classified under GHS with signal word Danger and hazard statements H315 — Causes skin irritation, H317 — May cause an allergic skin reaction and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 2778-42-9
Jingsj CID: J-1131940-7
Molecular Formula: C₁₄H₁₆N₂O₂
Molecular Weight: 244.289 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	-10 °C
Boiling Point	309.9±35.0 °C at 760 mmHg
Density	1.0±0.1 g/cm3
Flash Point	126.4±31.3 °C
Exact Mass	244.121185
PSA	58.86000
LogP	4.39
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.515

GHS Safety & Compliance

Acute Toxicity / Health Hazard / Environmental HazardSignal word: Danger

H315 — Causes skin irritation
H317 — May cause an allergic skin reaction
H319 — Causes serious eye irritation
H330 — Fatal if inhaled
H372 — Causes damage to organs through prolonged exposure
H410 — Very toxic to aquatic life with long lasting effects

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 1,3-Bis(1-isocyanato-1-methylethyl)benzene?

The CAS number of 1,3-Bis(1-isocyanato-1-methylethyl)benzene is 2778-42-9.

What are the molecular formula and molecular weight of 1,3-Bis(1-isocyanato-1-methylethyl)benzene?

1,3-Bis(1-isocyanato-1-methylethyl)benzene has molecular formula C14H16N2O2 and molecular weight 244.289 g/mol.

Is 1,3-Bis(1-isocyanato-1-methylethyl)benzene hazardous?

1,3-Bis(1-isocyanato-1-methylethyl)benzene has GHS signal word Danger and hazard statements H315 — Causes skin irritation; H317 — May cause an allergic skin reaction; H319 — Causes serious eye irritation.

What are the upstream and downstream products of 1,3-Bis(1-isocyanato-1-methylethyl)benzene?

For 1,3-Bis(1-isocyanato-1-methylethyl)benzene, Upstream Products: Isocyanic acid, 1,3-diisopropenylbenzene.

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. "1,3-Bis(1-isocyanato-1-methylethyl)benzene (CAS 2778-42-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1131940-7 (accessed 2026-11-09).

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