Biodegradable and compostable vessels, such as coffee pods, coated with pecvd coatings or layers

A vessel comprising a wall at least partially made of a biodegradable material as defined by ASTM D 6400 or EN ISO 472:2001, at least partially made of a compostable material as defined by ASTM D 6400 or ISO/DIS 17088, or both, having an interior surface enclosing a lumen, an exterior surface, and a PECVD coating set on the interior surface or the exterior surface or both, the PECVD coating set comprising:

• optionally, a tie coating or layer comprising SiOxCy, in which x is from about 0.5 to about 2.4 as measured by X-ray photoelectron spectroscopy (XPS) and y is from about 0.6 to about 3 as measured by XPS;
• a barrier coating or layer of SiOx, in which x is from about 1.5 to about 2.9, alternatively from about 1.5 to about 2.6, alternatively from about 1.5 to about 2.0, as measured by XPS, which, if a tie coating or layer is present, is positioned on top of the tie coating or layer;
• optionally, a pH protective coating or layer of SiOxCy, in which x is from about 0.5 to about 2.4 as measured by XPS and y is from about 0.6 to about 3 as measured by XPS, positioned on top of the barrier coating or layer.