The interoperability of nanosafety data is a cornerstone of advancing scientific understanding in this domain. By converting semi-structured datasets into RDF, we ensured that these datasets could be linked and queried across diverse platforms and resources. RML was selected due to its adherence to W3C standards (by extending R2RML), extensibility through custom functions and its flexibility. Furthermore, the mapping language itself is expressed in a semantic format which makes the mapping rules machine-readable and interoperable.