| abstract |
The present invention relates to the technical field of coated surfaces, for example interior surfaces of pharmaceutical packages or other vessels for storing or in contact with fluids. It encompasses a vessel comprising a thermoplastic wall enclosing a lumen, an SiOx composite barrier coating/layer, an interior surface of the composite barrier coating/layer facing the lumen, and a pH protective coating/layer of SiOxCy or SiNxCy, the pH protective coating/layer having an interior surface facing the lumen and an outer surface facing the interior surface of the composite barrier coating or layer, in which an FTIR absorbance spectrum of the pH protective coating/layer has a ratio greater than 0.75 and at most 1.7 between the maximum amplitude of the Si-O-Si symmetrical stretch peak between about 1000 and 1040 cm-1, and the maximum amplitude of the Si-O-Si asymmetric stretch peak between about 1060 and about 1100 cm-1. |