This working group aims to facilitate exchanges between producers and users of nanomaterials. Discussions will focus on the case of: 
 1/ identifying nanomaterials within a regulatory framework
 2/ characterization of the main physico-chemical properties required by French regulations (R-Nano) and European (REACh). 
Main actions : 
- Guideline information sharing OECD & Event organization, 
- Drafting of a guide illustrating the current technical limits to determining the "character" of a product. nanomaterial "for certain types of substances 
- Identification of needs in terms of validated and recognized methods, particularly for assessing the solubility of nanomaterials,