CAS 75-11-6 · Purity ≥99.50% · Density 3.32 g/cm³ (20 °C)
PalicaChem supplies methylene iodide with ≥99.50% content and a density of 3.32 g/cm³ at 20 °C. Methylene iodide is the densest common organic heavy liquid, above TBE (2.96 g/cm³) and bromoform (2.89 g/cm³). Each batch ships with a CoA covering 6 impurity and water limits.
| Property | Value |
|---|---|
| Density, 20 °C | 3.32 g/cm³ |
| Refractive index, nD 20 °C | approx. 1.74 |
| Melting point | approx. 6 °C |
| Boiling point | approx. 181 °C (decomposes) |
| Flash point | approx. 110 °C (closed cup) |
Methylene iodide freezes at about 6 °C. A shipment received in winter may arrive solid and returns to liquid at room temperature.
| Item | Specification |
|---|---|
| Appearance | Clear, colorless to pale yellow liquid |
| Diiodomethane, % | ≥99.50 |
| Acetone, % | ≤0.1 |
| Dichloromethane, % | ≤0.1 |
| Chloroiodomethane, % | ≤0.1 |
| Any other individual impurity, % | ≤0.1 |
| Water, % | ≤0.1 |
| Pack size | Container |
|---|---|
| 20 kg | Drum |
Every order includes a batch CoA and SDS.
Kimberlite indicator mineral labs typically dilute methylene iodide with acetone to 3.20 g/cm³ to recover garnet, ilmenite, chromite and Cr-diopside. Geochronology labs use undiluted methylene iodide at 3.32 g/cm³ to separate apatite (3.1–3.2) from zircon (about 4.5). For separations below 2.96 g/cm³, see our Tetrabromoethane (TBE).
Methylene iodide (RI about 1.74) is the base liquid for gem refractometer contact fluids. Formulators add sulfur or other dissolved solids to reach RI 1.79–1.81.
ASTM D7490 and the Owens-Wendt method pair water with diiodomethane (surface tension 50.8 mN/m at 20 °C) as the nonpolar probe liquid. Tell us your instrument brand and stabilizer requirement before ordering.
Diiodomethane is the methylene source in Simmons–Smith cyclopropanation. State water and individual-impurity limits when you request a quote.
| Methylene iodide | TBE | |
|---|---|---|
| CAS | 75-11-6 | 79-27-6 |
| Density, 20 °C | 3.32 g/cm³ | 2.96 g/cm³ |
| Typical use | Kimberlite indicators, apatite/zircon | Quartz/feldspar removal, spodumene HLS |
Both liquids can ship in one consignment to share freight.
Can methylene iodide be diluted to a lower density? Yes. Acetone, DMSO and DMF are common diluents, and acetone is the usual choice for 3.20 g/cm³ work.
How should it be stored? Store in amber containers below 30 °C, away from light. Copper turnings slow the release of free iodine.
Tell us your application, annual quantity in kg, destination country and pack size. A current product reference helps us match the grade.