Hi L
Here is the standards that Versarien makes reference too
https://www.iso.org/obp/ui/#iso:std:iso:ts:80004:-13:ed-1:v1:en
in their annual report they have the following comment
Where has Versarien made the most progress?
The most progress has to be in the graphene business: The introduction of ISO/TS 80004-13: 2017 last year was a welcome development as it defined the vocabulary for graphene and 2D related materials. We are confident that our products meet the criteria
No one has certified that they graphene meets the standards,
VRS make GNP 90% is under 10 layers.
PY is part of the Graphene Institute board, He advised me that the ISO haven't formally been introduced.
the UK have also brought out there own kind of standards. you can download that online,
I will need to find the link again
