Permeation occurs when media passes through a material, whereas absorption is when media absorbs into and becomes part of a material. Will the material prevent or limit permeation and absorption? All materials, even metals, are subject to such, so this question is one of degree. ![]() Can it tolerate the temperature range of the system media?.Is the material chemically compatible with the system media? Will it.When selecting a hose, start with the core tube, the hose’s innermost layer that comes into contact with the system media. Be sure to consider hose longevity, maintenance and replacement costs and other cost-of-ownership factors.Ī hose has four main parts: core tube material and construction reinforcement layers covers and end connections. Hoses "cost" more than their purchase price. Hose selection requires attention to application variables such as temperature, pressure and flow, as well as requirements ranging from chemical compatibility to drainability.
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