Metallisation is a somewhat specialised process. Normally applied to pre-stretched (bi-axially oriented) films of PP or PET, the aluminium is vapour deposited on to the moving web in a high vacuum vessel. I dont see why a metalliser wouldn't apply such a coating to a pre-treated (corona or flame...
An injection moulded part used in a coffee machine seems to loose strength with time/use and break. New mouldings have more than adequate strength for the job. Has anyone experience with ageing of Noryl in a damp coffee/milk environment. Examination of failed parts(broken edges) shows no obvious...