Dear Manish Kumar ,

Hope this articles helps you out:

https://link.springer.com/content/pdf/10.1007/978-0-387-69002-5_61.pdf

The relative permeability of a polymer refers to its ability to allow the passage of a specific substance, such as a gas or liquid, relative to the permeability of a reference material. The relative permeability is a dimensionless quantity and is typically expressed as a ratio or a fraction.

The value of relative permeability can vary widely depending on the type of polymer and the substance being considered. Different polymers have different molecular structures and physical properties, which can influence their permeability to different gases or liquids.

For example, some polymers, like polyethylene and polypropylene, have relatively low permeability to gases and are often used as barriers in packaging applications to prevent the passage of oxygen or moisture. On the other hand, certain polymers, such as silicone rubber, can exhibit high permeability to gases, making them suitable for applications where gas transfer is desired, like in membranes for gas separation processes.

It's important to note that the relative permeability of a polymer can also depend on other factors such as temperature, pressure, and the presence of additives or fillers. Therefore, it is necessary to consider these factors when evaluating the permeability characteristics of a specific polymer for a particular application.

Dear all, it is important to distinguish between 'permeability' and 'relative permeability'. This later is used whenever different species in flow are compared. Please have a look at the example in the attached file. My Regards

The relative permeability of a polymer refers to its ability to permit the flow of a particular substance, such as gases or liquids, relative to the permeability of a reference material. It is a dimensionless quantity. It is a material specific property. It depends on chemical structure, molecular weight, crystallinity, and processing conditions. Different polymers have different permeability properties, and even within a specific polymer family, variation can exist due to differences in the polymers's composition or structure.

For example, some polymers like polyethylene and polypropylene have relatively low relative permeability to gases, making them effective barriers to gas transmission. On the other hand, some polymers like polydimethylsiloxane (PDMS) have high relative permeabilities to gases and are often used in gas permeable membranes.

Hi Manish,

The relative permeability of a polymer refers to its ability to allow the flow of magnetic flux compared to a vacuum or free space. It is a dimensionless quantity represented by the symbol μr (mu-r). Relative permeability is commonly used in the context of magnetic materials and is an important property when considering their behavior in magnetic fields.

In the context of magnetic materials, such as ferromagnetic or paramagnetic polymers, the relative permeability indicates how much the material can be magnetized in the presence of an external magnetic field. A relative permeability greater than 1 indicates that the material is more permeable to magnetic flux than free space, making it easier to magnetize. On the other hand, a relative permeability less than 1 indicates that the material resists magnetization.

Hope it helps.