Product description. 1.Chemical name: Methyl silicone oil 201 2.Alias: PDMS/ polydimethylsiloxane 3.Viscosity: 350�± 10% 4: Volatile fraction (%) < 0.5 5:Appearance and Properties: colorless transparent dense liquid Products Description Melting point â??59 �°C(lit.) Boiling point 101 �°C(lit.) density 0.963 g/mL at 25 C vapor density >1 (vs air) vapor pressure 270 C (518 F) storage temp. 2-8C form Oily Liquid color Clear colorless Specific Gravity 0.853 Odor Odorless Water Solubility PRACTICALLY INSOLUBLE