Patent ID: 8916248

Claim:
A metal-coated polymer article comprising: (i) a polymeric material; (ii) a metallic material having a microstructure which is fine-grained with an average grain size between 2 and 5,000 nm and/or amorphous, wherein the metallic material is in the form of a metallic layer having a thickness between 10 micron and 2.5 cm and a maximum porosity of 1.5%; (iii) with or without at least one intermediate layer between the polymeric material and the metallic material; wherein said metal-coated polymer article having a leak rate in air of between 0 and 6.6 mm Hg pressure per hour and per cm 2 measuring area after applying a vacuum of 29″ of Hg and measuring the loss of vacuum over the duration of 60 minutes.