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2.6: BoPET: 3.1 [2] Paper, printing: 1.4 [3] (200 kHz) Electroactive polymers: 2–12 Mica: 3–6 [2] Silicon dioxide: 3.9 [4] Sapphire: 8.9–11.1 (anisotropic) [5] Concrete: 4.5: Pyrex : 4.7 (3.7–10) Neoprene: 6.7 [2] Natural rubber: 7: Diamond: 5.5–10 Salt: 3–15 Melamine resin: 7.2–8.4 [6] Graphite: 10–15 Silicone rubber: 2.9–4 ...
For example, the effect of temperature on the permeability can be as high as 10% per °C, making it possible that MVTR results achieved at 23°C and 37°C can differ by a factor 4. The most common international unit for the MVTR is g/m 2 /day, or " metric perm ".
3.1.5 Silicone hydrogel polymers. ... Download as PDF; Printable version; In other projects ... 14.5–31.3: Frequency 55 Toric, Hydrasoft Sphere, Hydrasoft Sphere ...
Download as PDF; Printable version; In other projects ... [6] Graphite: 10–15 Silicone rubber: 2.9–4 [7] Silicon: 11.68: ... [14] Temperature dependence of the ...
In physics and engineering, permeation (also called imbuing) is the penetration of a permeate (a fluid such as a liquid, gas, or vapor) through a solid.It is directly related to the concentration gradient of the permeate, a material's intrinsic permeability, and the materials' mass diffusivity. [1]
The concept of permeability is of importance in determining the flow characteristics of hydrocarbons in oil and gas reservoirs, [4] and of groundwater in aquifers. [5]For a rock to be considered as an exploitable hydrocarbon reservoir without stimulation, its permeability must be greater than approximately 100 md (depending on the nature of the hydrocarbon – gas reservoirs with lower ...
Oxygen permeability (OP) is a parameter of a contact lens that expresses the ability of the lens to let oxygen reach the eye by diffusion. In soft contact lenses, it is dependent on the thickness of the lens and the material of the lens, especially concerning the water content.
Silicone rubber is an elastomer (rubber-like material) composed of silicone—itself a polymer—containing silicon together with carbon, hydrogen, and oxygen. Silicone rubbers are widely used in industry, and there are multiple formulations.