Polydimethylsiloxane Description
Polydimethylsiloxane (PDMS) is a widely used silicon-based organic polymer that is optically transparent and known for being inert, non-toxic, and non-flammable. It is the most common silicone polymer, utilized in various industries, including microfluidic systems, caulking agents, lubricants, and contact lenses for biomicroelectromechanical applications.
In its liquid form, dimethylsiloxane is classified as silicone oil—a colorless, odorless, non-toxic, and non-volatile liquid. When in solid form, it becomes silica gel, a hydrophobic, inert material that is also non-flammable and a transparent elastomer.
| Chemical name | Polydimethyl siloxane (PDMS) |
| Product Category | Silicone Intermediate |
| Structural Formula |  |
| CAS No. | 63148-62-9 and 9016-00-6, 9006-65-9 |
| EINECS | 226-171-3 |
| Molecular formula | (C2H6OSi)n |
| Molecular weight | 74.01880 |
| Equivalent Chemical Name | PDMS; dimethicone; E900 |
| Physical Properties | Colorless transparent liquid, molecular weight is 74.1. |
| Chemical Properties | Stable. Flammable or combustible. Flammability depends upon extent of polymerization. Incompatible with strong oxidizing agents. |
| Density(20C;g/cm3) | 0.971 |
| Refractive index | 1.4035 |
| Flash Point * (°C) | 63 |
| Boiling Point (°C) | 155-220 |
| Specific Gravity | 0.918 |
| Storage temp | Refrigerator |
| Uses | Industrial sector used as lubricating oil, anti-vibration oil, insulating oil, defoaming agent, mold release agent, etc.; And uses; Widely used as insulation, lubrication, anti-vibration, anti-dust oil, dielectric fluid and heat carrier, and used as defoaming, additives for film stripping, paint and cosmetics for daily use, etc. |
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