Product Name: Methylsiloxane Polymer
Chemical Family: Polysiloxanes
Formula: Varies, general formula (CH3)3SiO[Si(CH3)2O]nSi(CH3)3
Synonyms: Dimethylpolysiloxane, Polydimethylsiloxane, Silicone Fluid
Manufacturer: Contact local supplier or manufacturer
Recommended Use: Lubricant, defoamer, anti-foaming agent, hydraulic fluids, dielectric fluids, personal care products
Emergency Telephone Number: Refer to manufacturer’s emergency contact details on container label
Classification: Not classified as hazardous under GHS regulations; product typically presents low acute toxicity
Physical Hazards: Non-flammable, but can form dangerous combustion products under fire conditions
Health Hazards: May cause mild, reversible irritation to eyes or skin on prolonged or repeated contact
Environmental Hazards: Product can persist in environment; silicone oils have low motility and biodegradability
Label Elements: Avoid eye and skin contact; use appropriate protection; if inhaled in mist form, may cause transient respiratory discomfort
Pictograms: No pictogram required
Signal Word: None required
Chemical Name: Dimethylsiloxane, reaction product with silica
Common Components: Dimethylpolysiloxane (CAS No. 63148-62-9), minor amounts of trimethylsiloxy-terminated siloxanes
Concentration: 90–100% of main polymer by weight, with traces of silanol, silanolates or other low-molecular weight siloxanes
Impurities: May contain less than 1% residual monomers or silica; check batch-specific certificate if available
Inhalation: Move person to fresh air; seek medical attention if symptoms such as cough or respiratory discomfort persist
Skin Contact: Gently wash thoroughly with soap and water; remove contaminated clothing; seek medical help if irritation develops
Eye Contact: Flush eyes cautiously with water for several minutes, remove contact lenses if present and easy to do; medical advice recommended if irritation persists
Ingestion: Rinse mouth with water; do not induce vomiting; get medical attention if large quantity ingested or adverse health effects occur
Other: Provide usual supportive measures for chemical exposure; symptomatic treatment based on clinical judgment
Suitable Extinguishing Media: Water spray, foam, dry chemical, carbon dioxide
Unsuitable Extinguishing Media: None known for polymer; avoid direct water jets that may spread burning liquid
Specific Hazards: Combustion at very high temperatures releases toxic gases including formaldehyde, carbon oxides, irritating siloxane fumes
Protective Equipment: Wear full firefighting gear, self-contained breathing apparatus
Special Procedures: Evacuate area, control runoff; cool containers with water spray; prevent spillage from entering drains and sewers
Fire/Explosion Sensitivity: Not sensitive to mechanical impact or static discharge under normal conditions
Personal Precautions: Use gloves, safety glasses or goggles; consider local ventilation
Environmental Precautions: Prevent spillage from entering waterways and soil; notify authorities for significant releases
Spill Cleanup Methods: Absorb with inert dry material (sand, earth, vermiculite); collect mechanically for disposal; clean remaining residue with soap and water
Decontamination: Avoid emulsifiers that may increase mobility in the environment; dispose of cleaning materials in accordance with local waste regulations
Handling: Operate in well-ventilated areas; avoid breathing vapors or aerosols; minimize repeated or prolonged skin contact
Safe Hygiene Practices: Wash hands after handling; do not eat, drink, or smoke in areas of use or storage; remove contaminated clothing promptly
Storage Conditions: Store tightly sealed in original or compatible containers; keep cool, dry, and away from strong oxidizing agents; avoid prolonged exposure to heat, sunlight, or extreme cold
Incompatibles: Strong acids, strong bases, oxidizers, moisture-sensitive materials
Recommended Packaging: Use steel, aluminum, or appropriate plastic containers verified for chemical compatibility
Occupational Exposure Limits: No established ACGIH or OSHA exposure limits for main component
Engineering Controls: Local exhaust or general ventilation for operations generating mist or fume
Respiratory Protection: Normally not required; if exposure thresholds exceeded, use NIOSH-approved respirator
Skin Protection: Chemical-resistant gloves (nitrile, neoprene); coverall clothing if splashing likely
Eye Protection: Safety glasses with side-shields or splash goggles
Other Protection: Emergency eyewash and shower facilities in vicinity of use
Environmental Exposure: Utilize containment; follow local emission limits
Physical State: Viscous liquid, clear to slightly hazy
Color: Colorless to slightly yellow
Odor: Nearly odorless, slight characteristic odor
Boiling Point: 150–300°C (varies by molecular weight)
Melting Point: -60°C to -40°C (depending on grade)
Vapor Pressure: Negligible at 25°C
Vapor Density: >1 (air=1)
Solubility: Insoluble in water; soluble in many organic solvents
Density: 0.93–0.98 g/cm³ at 25°C
Viscosity: 5–100,000 cSt depending on polymer chain length
pH: Not applicable
Flash Point: 150–325°C, open cup (depends on grade)
Autoignition Temperature: >400°C
Explosive Limits: Not applicable
Partition Coefficient (log Kow): >4, high potential for bioaccumulation
Chemical Stability: Stable at recommended temperatures and pressures
Thermal Decomposition: Yields formaldehyde, carbon monoxide, carbon dioxide, lower molecular weight siloxanes
Reactivity: May react with strong oxidizers, acids, and bases
Conditions to Avoid: Excessive heat, open flames, prolonged sunlight, contamination with incompatible materials
Hazardous Polymerization: Does not occur
Incompatible Materials: Strong acids, strong bases, oxidizing agents
Decomposition Products: Silica, formaldehyde gas, carbon oxides, unstable siloxane fragments
Likely Routes of Exposure: Skin contact, inhalation of mist or vapor, accidental eye contact, ingestion
Acute Oral Toxicity: LD50 (oral, rat) > 5000 mg/kg – low toxicity based on similar compounds
Acute Dermal Toxicity: LD50 (dermal, rat) > 2000 mg/kg – minimal hazard
Eye/Skin Irritation: Slight irritation possible on direct, prolonged contact
Respiratory: No symptoms in normal use, inhalation of dense mist can cause mild mucosal irritation
Chronic Effects: No evidence of cumulative systemic toxicity, carcinogenicity, mutagenicity, reproductive toxicity based on industry data
Sensitization: No known sensitizing effects
Other Toxicological Data: Not classified as acutely toxic, not listed as carcinogen by IARC, NTP, ACGIH, or OSHA
Ecotoxicity: Not classified as hazardous to aquatic life; LC50 (fish, 96hr) typically > 100 mg/L means limited acute toxicity to aquatic organisms
Persistence and Degradability: Polymer is resistant to photolysis and microbial degradation; expected to persist in soils and sediments
Bioaccumulation: High log Kow value may indicate moderate bioaccumulation in aquatic organisms, especially in high molecular weight forms
Mobility: Tends to adsorb to sediment and organic particulate matter, low vapor phase migration
Environmental Fate: Emissions to air unlikely to disperse; product can remain in environment for extended periods if not adequately controlled
Other Adverse Effects: No known ozone depletion potential, no evidence of long-range environmental transport
Waste Disposal: Dispose as hazardous or special waste according to local and national regulations; do not eject into drains, waterways, or soil
Recommended Methods: Incineration in approved, properly equipped facilities with flue gas cleaning
Container Disposal: Empty containers should be triple rinsed with suitable solvent, rendered unusable, and recycled or disposed of according to regulations
Other Precautions: Do not attempt to landfill large volumes without checking compatibility and regulatory approval
Transport of Waste: Ensure documentation and labeling comply with jurisdictional hazardous waste requirements
UN Number: Not regulated for transport under ADR, IMDG, or IATA
Proper Shipping Name: Methylsiloxane Polymer, not dangerous goods
Transport Hazard Class: None assigned
Packing Group: None
Marine Pollutant: Not classified as marine pollutant (consult local regulations)
Special Precautions: Avoid container breakage; keep containers upright and secure during transport; prevent leaks
Emergency Response: Spill kit and reporting procedures advised for transport of bulk shipments
TSCA: All components listed in US TSCA Inventory
REACH: Registered or exempted from registration in EU REACH, consult official registrant for confirmation
OSHA Hazard Communication: Not classified as hazardous chemical
SARA: Not subject to SARA Title III reporting or thresholds
California Prop 65: Not listed as known to cause cancer or reproductive toxicity
Canada DSL/NDSL: All substances listed or exempt
Other Regulations: Not listed as controlled substance by major global chemical regulations
Labeling: Industrial use only, use permitted for trained professionals; standard workplace safety signage applies
