Donna ChenJun 19, 20211 minIrreversible Photochromic PigmentColour appears irreversibly when exposed to UV but not the visible light The irreversible photochromic products show their colours when...
Donna ChenMay 3, 20201 minKN95 FFP2 Mask Layer StructureSchematic presentation of the layer structure of an KN95 FFP2 mask Schematische Darstellung der Schichtstruktur einer KN95 FFP2-Maske
Donna ChenApr 11, 20201 minFFP2 and KN95 face masks/ FFP2 und KN95 GesichtmaskeCE certified FFP2 and KN95 face masks available at Donna Polymer
Donna ChenMar 19, 20201 minAnti-Epidemic Materials against Coronavirus disease (COVID-19)Anti-Epidemic Materials against Coronavirus disease (COVID-19) Against Coronavirus, we also want to help. Many of the accessories of...
