BS ISO 20523:2017 specifies classification, designations and short names for carbon based films. These are
films in which carbon is the predominant constituent part and which are deposited by physical vapour
deposition (PVD) or chemical vapour deposition (CVD) process. This includes amorphous carbon-based
films, also called diamond-like carbon films (DLC), as well as CVD diamond films, graphite and polymerlike
films.This document is applicable to those films which are produced on an industrial scale. Additional carbon
based films are under development.This document refers to the material of carbon based films. It does not refer to the entire coating that
can consist of a main functional layer with additional layers below or on top.A layer can change in composition and/or material property over its thickness. Such layers are called
gradient layers. The definitions in this document refer to non-gradient layers.A carbon based film can include other elements like hydrogen, metal elements or others. Metal
constituents can be included as metal carbides. Films with additional elements are only covered by
this document if carbon is the predominant constituent part. Carbon incorporated as carbide, as can be
present in metal-containing amorphous carbon films (a-C:Me, a-C:H:Me), does not count to this amount.This document does not apply to the class of carbon materials such as fullerenes, carbon nanotubes and
graphene.Cross References:VDI 2840:2012All current amendments available at time of purchase are included with the purchase of this document.