PMHS
Polymethylhydrosiloxane
CAS: 63148-57-2
Molecular Formula: C7H22O2Si3
PMHS - Names and Identifiers
PMHS - Physico-chemical Properties
| Molecular Formula | C7H22O2Si3 |
| Molar Mass | 222.5 |
| Density | 1.006 g/mL at 25 °C (lit.) |
| Melting Point | <-60°C |
| Boling Point | 142°C(lit.) |
| Flash Point | 204 °C |
| Water Solubility | Not miscible or difficult to mix in water. |
| Vapor Presure | 38 hPa (20 °C) |
| Specific Gravity | 0.98 |
| PH | 7 (H2O) |
| Storage Condition | Store below +30°C. |
| Refractive Index | n20/D 1.382(lit.) |
| MDL | MFCD00084478 |
| Physical and Chemical Properties | hydrogen content,%≥ 1.58 |
| Use | Under the action of metal salt catalyst, low temperature can be cross-linked film, the formation of waterproof film on the surface of various substances, can be used as fabric, glass, ceramic, paper, leather, metal, cement, marble and other materials of waterproof agent; Especially the fabric waterproof. Methyl hydrogen silicone oil emulsion and methyl hydroxy silicone oil emulsion, can be waterproof and can maintain the permeability of the fabric and can improve the fabric tear strength, friction strength and antifouling, improve the fabric handle and stitching performance. In addition, it is used as a release agent and a cross-linking agent for paper. |
PMHS - Risk and Safety
| Hazard Symbols | Xi - Irritant |
| Risk Codes | R10 - Flammable R36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36 - Wear suitable protective clothing. S24/25 - Avoid contact with skin and eyes. S23 - Do not breathe vapour. S16 - Keep away from sources of ignition. |
| WGK Germany | 3 |
| FLUKA BRAND F CODES | 10-21 |
| TSCA | Yes |
| HS Code | 39100000 |
PMHS - Nature
Open Data Verified Data
methyl hydrogen silicone oil in addition to the general properties of dimethyl silicone oil, because of its molecular structure containing active Si-H bonds, it can participate in a variety of chemical reactions, with good film-forming properties. It can interact with water or alcohols in the presence of alkali or Lewis acid, and release
Hydrogen. In the presence of platinum chlorate, it is easy to react with alkenes. When the temperature is greater than 50 °c, it can be reacted with the epoxy group-containing compound. The heat resistance of methyl hydrogen silicone oil is not as good as that of dimethyl silicone oil, but its hydrophobic, moisture-proof and anti-adhesive properties are better than that of dimethyl silicone oil.
Last Update：2025-06-10 22:55:16
PMHS - Preparation Method
Open Data Verified Data
methyl hydrogen-containing silicone oil can be prepared by the following reaction.
- hydrolysis
- telogen
The mixed solution of methyldichlorosilane, trimethylchlorosilane and benzene calculated is added to the reaction kettle with water in advance. After the addition is finished, stirring is continued for 1H, and the mixture is left to stand and the acid water is removed, the oil layer was washed to neutrality with water. The telogen reaction is then carried out at room temperature in the presence of concentrated sulfuric acid. After the reaction, the sulfuric acid was removed, the oil layer was washed again to neutral, the low boiling substance was distilled off under reduced pressure, decolorized with activated carbon, and vacuum filtered to obtain the finished product.
Last Update：2022-01-01 11:08:50
PMHS - Application
Open Data Verified Data
methyl hydrogen silicone oil can be crosslinked at low temperature, forming a hydrophobic effect on the surface of various substrates, large contact angle, durable waterproof membrane, widely used in textile, paper, leather and construction industries. The treatment of fabrics with methyl hydrogen-containing silicone oil can not only improve the tear strength, wear resistance, wrinkle resistance and antifouling properties, but also greatly improve the hot resistance and sewing properties, and can not lose the original permeability and achieve the purpose of complete waterproof. In addition, the methyl hydrogen-containing silicone oil has better anti-adhesive properties than the dimethyl silicone oil, so it is widely used as a release agent in the rubber and plastic industry, and a release agent for paper and packaging materials. For example, the rubber factory with methyl hydrogen silicone oil for automobile tire mold release, can be used continuously for 1~2 weeks. The optical glass coated with methyl hydrogen silicone oil not only has excellent light transmittance, but also has excellent anti-mildew and moisture resistance. The methyl hydrogen-containing silicone oil may also be used as a metal rust inhibitor.
Last Update：2025-08-19 16:24:40
PMHS - Reference Information
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Introduction | polymethylhydrogensiloxane is a silicone oil used in biology and chemistry. Under the action of metal salt catalyst, low temperature can be cross-linked film, the formation of waterproof film on the surface of various substances, can be used as fabric, glass, ceramic, paper, leather, metal, cement, marble and other materials of waterproof agent; Especially the fabric waterproof. |
| Application | polymethylhydrogensiloxane can be used as a water-resistant, anti-adhesive foam stabilizer for textile, rubber, leather, paper, building materials, A cross-linking agent for a chain-like cross-linked product. |
| Use | 1. Used as textile, rubber, leather, paper, building materials waterproof, anti-adhesive foam agent, chain cross-linking agent 2. Is the raw material for the preparation of block copolymer 3. Under the action of metal salt catalyst, low temperature can be cross-linked film, the formation of waterproof film on the surface of various substances, can be used as fabric, glass, ceramic, paper, leather, metal, cement, marble and other materials of waterproof agent; Especially the fabric waterproof. 4. Methyl hydrogen silicone oil emulsion and methyl hydroxy silicone oil emulsion, can be waterproof and can maintain the permeability of the fabric and can improve the fabric tear strength, friction strength and antifouling, improve the fabric handle and stitching performance. In addition, it is used as a release agent and a cross-linking agent for paper. used as textile, rubber, leather, paper, building materials, waterproof, anti-adhesive foam agent, The cross-linking agent of the chain cross-linked product is the raw material for preparing the block copolymer Under the action of metal salt catalyst, the cross-linked film can be formed at low temperature, and the waterproof film can be formed on the surface of various substances, glass, ceramics, paper, leather, metal, cement, marble and other materials of waterproof agent; Especially the fabric waterproof. Methyl hydrogen silicone oil emulsion and methyl hydroxy silicone oil emulsion, can be waterproof and can maintain the permeability of the fabric and can improve the fabric tear strength, friction strength and antifouling, improve the fabric handle and stitching performance. In addition, it is used as a release agent and a cross-linking agent for paper. |
Last Update：2024-05-30 16:34:36
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