The ban will start from 18 December 2026, to give time for manufacturers to adapt their production processes if they want to continue to supply the market in Wales.
Bydd y gwaharddiad yn dechrau o 18 Rhagfyr 2026, i roi amser i weithgynhyrchwyr addasu eu prosesau cynhyrchu os ydynt am barhau i gyflenwi'r farchnad yng Nghymru.