ECHA just published a new practical guide on substance identity profile. The <link https: echa.europa.eu documents practical_guide_how_to_develop_prepare_sip_en.pdf _blank>guide provides practical advice to potential and existing registrants of the same substance to prepare and develop the substance identity profile (SIP). It complements the advice given in Appendix III of Guidance for identification and naming of substances under REACH and CLP and the Q&As.