Refractive index, surface tension, density, and viscosity-temperature coefficients are strikingly flat. Fluids with viscosities ≥ 50 cSt have negligible vapor pressure.Īt viscosities > 1,000 cSt (correlating to molecular weights > 30,000), polymer chain entanglement occurs which results in leveling of physical property change vs. The fluids are thermally stable indefinitely at 150 ☌ in air. An important consequence of the low intermolecular forces in polysiloxanes is the highest permeability coefficients of any polymer for oxygen and nitrogen. This causes polymers to spread over their own adsorbed films. The liquid surface tension of polydimethylsiloxane is lower than the critical surface tension of wetting (24 dynes/cm). Its dynamic viscosity is 10,000 cP, so its kinematic viscosity is 10,000 cp /1.42 7,042 cSt. At 68 degrees Fahrenheit (20 degrees Celsius), honey has a density of 1.42 g/ml (specific gravity 1.42). This results in one of the lowest glass transition temperatures of any polymer. The kinematic viscosity of water at 70 degrees Fahrenheit (21 degrees Celsius) is 1 centistoke, and the dynamic viscosity is 1 centipoise. The viscosity of a fluid is its resistance to shear or flow. The kinematic viscosity can also be called diffusivity of momentumsince it has the same dimensions as the diffusivity of heat and diffusivity of mass concentration. A converting table between viscosity units like Centiposes, milliPascal, CentiStokes and SSU. Polydimethylsiloxane has virtually no energy barrier for rotation. It is also expressed in terms of centistokes (cSt or ctsk). Conventional silicone fluids are composed of polymer chains with unique flexibility.
They are commercially produced in viscosities ranging from 0.65 to 20,000,000 cSt.
All of them lived well over 100 years ago one more than 400 years ago. 'The standard units given to these measurements are named after the physical scientists Pascal, Poiseuille and Stokes. Example: convert 15 cP to Pas: 15 cP 15 × 0.001 Pas 0.015 Pas. Dynamic viscosity (also called absolute viscosity) is a measure of flow under applied pressure kinetic viscosity is a measure of flow under gravity. The viscosity of different types of silicone oil, which is expressed in centistokes (1 cs 10 6 m 2 /s), arises from the molecular weight and from the length of the polymers: increasing a silicone oil’s molecular weight results in an increased polymer chain length and consequently an increase in its viscosity.
#CS VS CST VISCOSITY HOW TO#
Conventional fluids are the well-known general purpose silicones described in chemical notation as polydimethylsiloxanes. How to Convert Centipoise to Pascal Second. If values higher than 1000 cSt are required, the data given from 60 cSt can be multiplied accordingly by 10, 100, 1000 etc.
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