The list below showing 25 active volcanoes in the Philippines was based on the PHIVOLCS list with some included from the GVP. The number is not definite and depends on someone's definition of active or historical timeframe. Descriptions under Eruption were based on the GVP website.
PVD: Process flow diagram. Physical vapor deposition (PVD) describes a variety of vacuum deposition methods which can be used to produce thin films. PVD uses physical process (such as heating or sputtering) to produce a vapor of material, which is then deposited on the object which requires coating.PVD is used in the manufacture of items which require thin films for mechanical, chemical or electronic reasons.nside the Plasma Spray-Physical Vapor Deposition, or PS-PVD, ceramic powder is introduced into the plasma flame, which vaporizes it and then condenses it on the (cooler) workpiece to form the ceramic coating.
Parylene coatings share many properties. They are all lightweight, offering the utmost barrier protection for their low mass, and can also offer added strength when used to coat wires. Because they are transparent, parylene coatings are appropriate for use on medical devices where visibility is key.