Gaseous diffusion resistant article and method utilizing same

Details Gaseous diffusion resistant article and method utilizing same Gaseous diffusion resistant article and method utilizing same

A - Human Necessities

47

L

189/45, 18/777

A47L 9/24 (2006.01) F16L 9/12 (2006.01)

Patent

CA 1145272

- 1 - ABSTRACT A gaseous diffusion resistant tube comprising a core (1) of a liquid resistant plastics material, and an outer layer(5) of a plastics impact-resistant material, and has an intermediate layer (3) of a gaseous diffusion resistant plastics material interposed between and bonded to the core and the outer layer. The outer layer and the core are preferably made of a cross-linked polyolefinic material such as cross-linked polyethylene. The intermediate layer is preferably selected such that it is an adhesive for both the core and outer layer materials and such that it has a measure of elasticity to compensate the relative coefficients of linear expansion between the intermediate layer and its adjoining layers. Tubes in accord with this invention may be formed by co- extrusion with economy and precision and are particularly useful in central heating applications.

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