Introduction：Basic information about Polydimethylsiloxane, dihydroxy terminated CAS 70131-67-8, including its chemical name, molecular formula, synonyms, physicochemical properties, and safety information, etc.
Polydimethylsiloxane, dihydroxy terminated Basic information
| Product Name: | Polydimethylsiloxane, dihydroxy terminated |
| Synonyms: | SILICON PS 347.5;SILANOL TERMINATED POLYDIMETHYLSILOXANE;SILANOL TERMINATED POLYDIMETHYLSILOXANE,18000CS;SILANOL TERMINATED POLYDIMETHYLSILOXANES;PS 347.5;POLYDIMETHYLSILOXANE, DIHYDROXY TERMINATED;POLYDIMETHYLSILOXANE, SILANOL TERMINATED;baysilonc0.7 |
| CAS: | 70131-67-8 |
| MF: | HOSi |
| MW: | 45.09284 |
| EINECS: | 615-070-3 |
| Product Categories: | PDMS Elastomers/ResinsPolymer Science;Polysiloxanes;Self Assembly&Contact Printing;Silicones;Stamps for Nanoprint Lithography&Microcontact Printing;Polymer Science |
| Mol File: | 70131-67-8.mol |
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Polydimethylsiloxane, dihydroxy terminated Chemical Properties
| Melting point | <-60°C |
| Boiling point | 182 °C |
| density | 0.98 g/mL at 25 °C |
| refractive index | n20/D 1.406 |
| Fp | 155 °F |
| storage temp. | 2-8°C |
| form | Liquid |
| Specific Gravity | 0.97 |
| Appearance | Colorless to light yellow Liquid |
| Water Solubility | Soluble in carbon tetrachloride, benzene, chloroform, diethyl ether, toluene and other organic solvents. Insoluble in water and ethanol. |
| Cosmetics Ingredients Functions | MOISTURISING
SKIN CONDITIONING - EMOLLIENT
ANTIFOAMING |
| InChI | InChI=1S/HOSi/c1-2/h1H |
| InChIKey | XQSFXFQDJCDXDT-UHFFFAOYSA-N |
| SMILES | [Si]O[H] |
| EPA Substance Registry System | Hydroxy-terminated dimethyl siloxanes and silicones (70131-67-8) |
Safety Information
| Hazard Codes | Xi |
| Risk Statements | 36/37/38 |
| Safety Statements | 23-24/25-36-26 |
| WGK Germany | 1 |
| RTECS | VW3157812 |
| TSCA | TSCA listed |
| Storage Class | 10 - Combustible liquids |
Polydimethylsiloxane, dihydroxy terminated Usage And Synthesis
| Description | Polydimethylsiloxane, dihydroxy terminated is a non-toxic, optically transparent, inert, flammable silicone-based organic polymer. It is widely used in heat-resistant lubricants, flame retardants, medical devices, and cosmetics. Polydimethylsiloxane is hydrophobic, cytocompatible and viscoelastic and can be used for water-repellent coatings in the textile industry. |
| Chemical Properties | Silanol Terminated Polydimethylsiloxane is a silicon-basedorganic polymer that is nontoxic, optically clear, inert, and inflammablematerial. It is widely used in heat-resistant lubricants, fire retardants,medical devices, and cosmetics. Polydimethylsiloxane is hydrophobic,cytocompatible, and viscoelastic which can be used to prepare water-repellentcoatings in the textile industry. |
| Uses | Polydimethylsiloxane is frequently used in a liquid containing 4-5% silica gel, emulsifiers and preservatives. It is employed in applications like contact lenses, medical devices, elastomers, in shampoos, food (antifoaming agent), caulking, lubricants, kinetic sand , and heat-resistant tiles. PDMS is a common surfactant, component of defoamers and as an herbicidal penetran. |
| Solubility in organics | THF, toluene, Insoluble in water |
| Toxics Screening Level | The initial threshold screening level (ITSL) for hydroxyl-terminated dimethyl siloxanes and siliconesremains at 0.1 μg/m3 based on an annual averaging time. |
Polydimethylsiloxane, dihydroxy terminated Preparation Products And Raw materials
| Raw materials | EMULSIFIER-->Octamethylcyclotetrasiloxane-->Amino-modified silicone oil |
