Experimental approaches to data generation for REACH compliance of multi-walled carbon nanotubes: substance identification

Abstract

Applying regulatory-accepted, standardised test guidelines to multi-walled carbon nanotubes (MWCNTs) presents challenges. These challenges arise from the inherent physicochemical characteristics of MWCNTs to form entangled, highly cohesive bundles that agglomerate rapidly. Consequently, many test methods are not suitable for these materials. In this study, we evaluated the applicability of existing standardised analytical methods and explored potential alternatives suitable for MWCNTs. Our focus was on EU-REACH data requirements related to substance identification and physicochemical properties, particularly size, shape, and dustiness. We successfully established a non-invasive method to measure the length of individual carbon nanotubes within MWCNT bundle agglomerates that does not break the individual tubes.