Polyethylene pipe

Details Polyethylene pipe Polyethylene pipe

2005-06-14

2005-06-14

Hook, James (Department: 3754)

Pipes and tubular conduits

Flexible

Distinct layers

C138S141000, C428S036910

Reexamination Certificate

active

06904940

ABSTRACT:
Multi-layered pipe comprising a main layer of polyethylene compound having a resistance to stress cracking NPT measured according to ISO 13479 standard of less than 8000 hours and an internal layer of polyethylene compound having a resistance to stress cracking NPT of higher than 8000 hours, the thickness of the internal layer being between 1 and 25% of the total pipe thickness but not less than 0.3 mm.

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patent: 0 897 934 (1999-02-01), None
patent: WO97/33116 (1997-09-01), None

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