4-morpholinecarbaldehyde (CAS No.4394-85-8, CE No.224-518-3, INCI: Formyl Morpholine) is an ingredient listed in the Cosing, with the function: Solvent.
The substance is not currently regulated by European Cosmetics Regulation 1223/2009, nor is it listed in Annex VI of European CLP Regulation 1272/2008.

Belgium proposes to classify the substance as follows.

Identification
Index number
• 605-RST-VW-Y
Chemical name
• 4-morpholinecarbaldehyde
EC number
• 224-518-3
CAS number
• 4394-85-8
Classification
Hazard class and Category code(s)
• Skin Sens. 1B
Hazard statement code(s)
• H317 - May cause an allergic skin reaction.
Labelling
Pictogram, Signal word code(s)
• GHS07
• Wng (Warning)
Hazard statement code(s)
• H317 - May cause an allergic skin reaction.

Sources
• ECHA Weekly - Consultations on harmonised classification and labelling, ECHA, 18 June 2025
• Harmonised classification and labelling consultations - 4-morpholinecarbaldehyde, ECHA, 16 June 2025
• CLH report - Proposal for Harmonised Classification and Labelling - 4-morpholinecarbaldehyde, Belgian Federal Public Service Health, Food Chain Safety and Environment, Belgium, March 2025