Octamethylcyclotetrasiloxane is a colorless, transparent or milky white liquid with flammability and no odor. It is a compound obtained by the hydrolysis synthesis process of dimethyl dichlorosilane, followed by separation and distillation. It is an important intermediate in the organic silicon industry, mainly used for the preparation of organic silicon polymers such as methyl silicone oil. In addition, it is also used for insulation and moisture-proof of radio components, as well as surface deactivation agents for gas chromatography glass capillary columns. Octamethylcyclotetrasiloxane (OMCTS) has several applications in the semiconductor industry. First, it can act as a lubricant in the chemical vapor deposition (CVD) process of semiconductor manufacturing. Due to its unique ring structure and low surface tension, octamethylcyclotetrasiloxane can form a protective film on the friction surface, reducing friction and wear, and improving the efficiency and life of mechanical equipment. Secondly, octamethylcyclotetrasiloxane can also be used in the field of optical coating. It can be used to prepare thin films with high refractive index to improve the performance of optical devices. In addition, octamethylcyclotetrasiloxane also has good oxidation resistance, which can prevent corrosion of metal materials due to oxidation, so it is also widely used in lubricating oil, rust prevention agent and other fields.
Storage and Transportation Precautions
1. Store in a cool, ventilated, and dry place, away from flames and heat sources, with an ambient temperature of less than 30 ℃.
2. Do not mix with oxidants, acids, or alkalis during storage; The storage location should be equipped with corresponding types and quantities of fire-fighting equipment.
3. When operating this product, it is prohibited to use mechanical equipment and tools that are prone to sparks; When handling, load and unload with care to avoid leakage caused by container damage.
4. When transporting, please strictly follow the regulations of the Ministry of Transportation and use specialized hazardous materials for transportation.
1. Store in a cool, ventilated, and dry place, away from flames and heat sources, with an ambient temperature of less than 30 ℃.
2. Do not mix with oxidants, acids, or alkalis during storage; The storage location should be equipped with corresponding types and quantities of fire-fighting equipment.
3. When operating this product, it is prohibited to use mechanical equipment and tools that are prone to sparks; When handling, load and unload with care to avoid leakage caused by container damage.
4. When transporting, please strictly follow the regulations of the Ministry of Transportation and use specialized hazardous materials for transportation.
The mainstream preparation method is
Add dimethyldichlorosilane dropwise to water at a temperature of 30-40 ℃, layer and remove the acidic water. The oily substance is hydrolyzed with sodium hydroxide solution, and the hydrolysate and 0.5% -2% potassium hydroxide are added to the cracking kettle. The cracking is carried out under a vacuum of 120-140 ℃ and 99.8 kPa. The cracked product was fractionated and the 173-176 ℃ fraction was collected to obtain octamethylcyclotetraoxosilane.
Add dimethyldichlorosilane dropwise to water at a temperature of 30-40 ℃, layer and remove the acidic water. The oily substance is hydrolyzed with sodium hydroxide solution, and the hydrolysate and 0.5% -2% potassium hydroxide are added to the cracking kettle. The cracking is carried out under a vacuum of 120-140 ℃ and 99.8 kPa. The cracked product was fractionated and the 173-176 ℃ fraction was collected to obtain octamethylcyclotetraoxosilane.
Hazard Overview
2.1 GHS classification
Flammable liquid (Class 3)
The above information is considered correct, but does not include all information and is only used as a guide. The information in this document is based on our current knowledge and is correct
The specific safety instructions apply to this product. This information does not represent a guarantee of the nature of this product.
Refer to the reverse side of the invoice or packaging strip.
Acute toxicity, oral (Class 5)
Acute toxicity, inhalation (Category 5)
Acute toxicity, transdermal (Class 5)
Reproductive toxicity (Category 2)
Chronic aquatic toxicity (Category 4)
2.2 GHS labeling elements, including preventive statements
Pictogram
Warning words warning
Hazard statement
H226 flammable liquid and vapor.
H303+H313+H333 Swallowing, skin contact, or inhalation may be harmful.
H361 Suspected of causing harm to fertility or fetus.
H413 may cause long-term and sustained harmful effects on aquatic organisms.
Warning statement
preventive measure
Obtain special instructions for P201 before use.
P202 Do not move until you have understood all safety precautions.
P210 Keep away from heat sources/sparks/open flames. Smoking is prohibited.
P233 Keep the container closed.
P240 Container and loading equipment grounding/equipotential connection.
P241 Use explosion-proof electrical/ventilation/lighting equipment.
P242 can only use tools that do not generate sparks.
P243 Take measures to prevent electrostatic discharge.
P273 Avoid release into the environment.
P280 Wear protective gloves/protective clothing/protective goggles/protective mask.
Accident response
P303+P361+P353 If in contact with skin (or hair): Immediately remove/remove all contaminated clothing. Wash skin with water/
Shower.
P304+P312 If inhaled by mistake: If feeling unwell, call a detoxification center or doctor.
P312 If feeling unwell, call a detoxification center or doctor.
P370+P378 In case of fire: put out with dry sand, dry powder or insoluble foam.
Storage
Store P403+P235 in a well ventilated area. Maintain low temperature.
P405 storage must be locked.
Waste disposal
P501 Send the contents/containers to an approved waste treatment plant for disposal.
2.1 GHS classification
Flammable liquid (Class 3)
The above information is considered correct, but does not include all information and is only used as a guide. The information in this document is based on our current knowledge and is correct
The specific safety instructions apply to this product. This information does not represent a guarantee of the nature of this product.
Refer to the reverse side of the invoice or packaging strip.
Acute toxicity, oral (Class 5)
Acute toxicity, inhalation (Category 5)
Acute toxicity, transdermal (Class 5)
Reproductive toxicity (Category 2)
Chronic aquatic toxicity (Category 4)
2.2 GHS labeling elements, including preventive statements
Pictogram
Warning words warning
Hazard statement
H226 flammable liquid and vapor.
H303+H313+H333 Swallowing, skin contact, or inhalation may be harmful.
H361 Suspected of causing harm to fertility or fetus.
H413 may cause long-term and sustained harmful effects on aquatic organisms.
Warning statement
preventive measure
Obtain special instructions for P201 before use.
P202 Do not move until you have understood all safety precautions.
P210 Keep away from heat sources/sparks/open flames. Smoking is prohibited.
P233 Keep the container closed.
P240 Container and loading equipment grounding/equipotential connection.
P241 Use explosion-proof electrical/ventilation/lighting equipment.
P242 can only use tools that do not generate sparks.
P243 Take measures to prevent electrostatic discharge.
P273 Avoid release into the environment.
P280 Wear protective gloves/protective clothing/protective goggles/protective mask.
Accident response
P303+P361+P353 If in contact with skin (or hair): Immediately remove/remove all contaminated clothing. Wash skin with water/
Shower.
P304+P312 If inhaled by mistake: If feeling unwell, call a detoxification center or doctor.
P312 If feeling unwell, call a detoxification center or doctor.
P370+P378 In case of fire: put out with dry sand, dry powder or insoluble foam.
Storage
Store P403+P235 in a well ventilated area. Maintain low temperature.
P405 storage must be locked.
Waste disposal
P501 Send the contents/containers to an approved waste treatment plant for disposal.
