Sources & Evidence Levels

Technical content in this knowledge center is built on defined evidence levels. This page explains the hierarchy and the rules for using each level.

Evidence levels

Level	Source type	Examples
A	Company test data / official documentation	Company test reports, official product documentation, documented field test records.
B	Government / standards organization	National standards, ministry documents, standards-body publications.
C	Peer-reviewed literature / academic sources	Journal articles, academic reviews on adsorption and catalysis.
D	Established technical organizations	Engineering handbooks, established industry technical references.
E	Secondary technical source	Reputable technical media, vendor-neutral technical articles.

No fabricated citations. Every cited source must exist. If a source cannot be cited precisely, the claim is written as a qualified technical explanation instead of manufacturing a reference.
No invented data. Test results, capacities, certifications and customer names are never invented. If the data is unavailable, the page says what is known and what is not.
No invented standards. A standard is cited only by its real number, title and issuing body, and only claimed as current after verification.
Company vs independent. "Company-provided information" is distinguished from "independently documented information". Brochure claims are not automatically converted into verified facts.
Qualified explanations over fake certainty. Where evidence is unavailable, the knowledge center explains the general principle and marks the gap — it does not manufacture certainty.

Level A data carries the data classification of the claim (see Data Classification).
Level B standards carry number, issuing body and last-verified date.
Level C–E content is used for general mechanisms and engineering practice, not for company product claims.

For the overall handling of uncertainty, see Technical Data & Source Methodology.