Home › Chemicals › Silicone Oil (Polydimethylsiloxane) CAS 63148-62-9: Silicone Oil (Polydimethylsiloxane) ((C2H6OSi)n) Identity CAS Number 63148-62-9 Molecular Formula (C2H6OSi)n IUPAC Name polydimethylsiloxane Molecular Weight 770.0 g/mol SMILES C[Si](C)(O[Si](C)(C)O[Si](C)(C)C)CSynonyms PDMS, dimethyl silicone oil, dimeticone, polydimethylsiloxane
2D Structure
Physical Properties Density 0.965 g/mL at 25°C Boiling Point None°C Melting Point -50.0°C Flash Point 315.0°C Vapor Pressure 0.0 kPa at 20°C Refractive Index nD = 1.403 Dielectric Constant ε = 2.8
Safety & GHS Classification
Storage: Store in tightly sealed containers. Very low toxicity. Highly stable — resistant to heat, oxidation, and most chemicals. Viscosity ranges from 0.65 cSt to 1,000,000 cSt.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Good PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Good NBR Good EPDM Good Silicone Excellent FKM Good
Metals Material Rating Stainless 316 Excellent Aluminum Excellent Copper Excellent Brass Excellent
Applications Hydraulic fluid and damping fluid Cosmetics (hair care, skin care) Defoamer in food processing Medical devices (implant material) Dielectric coolant for transformers Release agent for molding Heat transfer fluid Laboratory lubricant (glass joints) External References: PubChem
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