Molekula
4,4'-Methylenebis(phenyl isocyanate)
Supplying 4,500+ customers in over 80 countries
ISO 9001:2015 & ISO 14001:2015 certified · Supplying laboratories and industry since 2000 · Listed pack sizes are a starting point — we manufacture, source and repack to the quantity you need
4,4'-Methylenebis(phenyl isocyanate), commonly known as MDI, is a versatile organic isocyanate used primarily in the production of polyurethane foams, coatings, adhesives, and elastomers. It serves as a key reactive intermediate in polymer synthesis, offering excellent mechanical properties and thermal stability to final products. This chemical has a CAS number of 101-68-8, with the molecular formula CH2(C6H4NCO)2 and a molecular weight of 250.25 g/mol. It requires careful storage at -15 to -20°C and carries a **Danger** signal word due to its high reactivity and potential health hazards. Molekula supplies 4,4'-Methylenebis(phenyl isocyanate) from research to bulk quantities with full documentation and ISO 9001:2015 traceability.
Example image for illustration only. Other packaging and pack sizes are available.
Pricing & pack sizes
Pack sizes & pricing
Pricing on request — packs available from research to bulk quantities.
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Specifications
| Property | Value |
|---|---|
| Appearance | White to yellow crystalline powder or lumps |
| Melting Point | 39 - 46°C |
| Assay | ⩾ 97.5% |
| Identification (IR) | Conforms to Reference |
Storage & handling
| Property | Value |
|---|---|
| Storage Temperature | -15 to -20 °C |
| Flash Point | 200 °C |
| Acidity | Neutral |
Literature values
Published physical properties of the substance, not batch specifications.
| Property | Value |
|---|---|
| Appearance | Light-yellow, fused solid |
| Odour | Odorless |
| Melting Point | 37 °C |
| Boiling Point | 313.9 °C |
| Density | 1.2 (relative, water = 1) |
| Solubility (other solvents) | Soluble in acetone, benzene, kerosene, and nitrobenzene |
| Vapour Pressure | 5.0 × 10⁻⁶ mmHg at 25 °C |
| Refractive Index | 1.5906 |
Source: PubChem CID 7570 (HSDB, The National Institute for Occupational Safety and Health (NIOSH), ICSC)
Identification
| Property | Value |
|---|---|
| SKU | 90026982 |
| CAS Number | 101-68-8 |
| IUPAC Name | 1-isocyanato-4-[(4-isocyanatophenyl)methyl]benzene |
| EC Number | 202-966-0 |
| Molecular Formula | CH2(C6H4NCO)2 |
| Molecular Weight | 250.25 |
| Exact Mass | 250.0742 |
| SMILES | C1=CC(=CC=C1CC2=CC=C(C=C2)N=C=O)N=C=O |
| InChIKey | UPMLOUAZCHDJJD-UHFFFAOYSA-N |
| InChI | InChI=1S/C15H10N2O2/c18-10-16-14-5-1-12(2-6-14)9-13-3-7-15(8-4-13)17-11-19/h1-8H,9H2 |
| PubChem CID | 7570 |
| REACH Code | Y110 |
| TSCA Listed | Yes |
| HTS Code | 29291080 |
| Tariff Code | 2929100090 |
Safety & GHS
-
Health Hazard
GHS07
-
Serious Health Hazard
GHS08
Hazard statements
- EUH204 Contains isocyanates. May produce an allergic reaction.
- H317 May cause an allergic skin reaction
- H319 Causes serious eye irritation
- H332 Harmful if inhaled
- H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled
- H351 Suspected of causing cancer
- H373 May cause damage to organs through prolonged or repeated exposure
Precautionary statements
- P202 Do not handle until all safety precautions have been read and understood
- P260 Do not breathe dust/fume/gas/mist/vapours/spray
- P280 Wear protective gloves/protective clothing/eye protection/face protection
- P302+352 IF ON SKIN: Wash with soap and water
- P305+351+338 IF IN EYES: Rinse with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
- P308+313 IF exposed or concerned: Get medical advice/attention
Documents
Safety Data Sheets (SDS)
Available in English, French, German, Italian, Spanish.
Certificate of Analysis (CoA) by batch
Enter a lot or batch number to retrieve the CoA for that specific batch. We can generate one from spec data if no PDF is on file.
Synonyms
- 1,1'-Methylenebis(4-isocyanatobenzene)
- 4,4'-Diisocyanatodiphenylmethane
- 4,4'-Diphenylmethane diisocyanate
- 4,4'-Methylenediphenyl diisocyanate
- Bis(4-isocyanatophenyl)methane
- Desmodur 44
- Diphenylmethane diisocyanate
- Isonate
- Methylbisphenyl isocyanate
- p,p'-Diphenylmethane diisocyanate
Frequently asked questions
What is 4,4'-Methylenebis(phenyl isocyanate) (MDI) commonly used for?
MDI is primarily used as a key raw material in the production of polyurethane foams, coatings, adhesives, and elastomers, including rigid foams for insulation and flexible foams for seating.
What is the chemical formula and molecular weight of MDI?
The chemical formula is **CH₂(C₆H₄NCO)₂**, and the molecular weight is **250.25 g/mol**.
How should MDI be stored safely?
MDI must be stored at **-15 to -20°C** in a cool, dry place, away from moisture, heat, and incompatible materials. Proper ventilation is required.
What grades or purity levels of MDI does Molekula supply?
Molekula supplies **technical-grade MDI** (typically ≥99.5% purity) suitable for industrial applications. Custom specifications may be available upon request.
Can Molekula supply MDI in bulk quantities?
Yes, Molekula can supply MDI in bulk, including drums (200L), IBCs (1000L), and custom packaging for large-scale industrial needs.
What documentation comes with an MDI order?
Each order includes a **Certificate of Analysis (CoA)**, **Material Safety Data Sheet (MSDS/SDS)**, and **batch-specific documentation** for traceability and compliance.
Ready to order or need a custom pack?
Tell us the product, grade, and quantity — Molekula usually responds within one working day with pricing and lead time.